Cross, GD and Slade, B. Advances In T-Lymphocyte Immunophenotyping and Absolute CD4 T-Cell Count Determinations. 16th Annual Clinical Applications of Cytometry . 11-11-2001.

Kahn, M., Slade, B., Schalla, W. O., Lipman, H, and Fehd, R. J. Retrospective Analysis of the HIV-1 RNA Test (Viral Load) Using the Model Performance Evaluation Program Data from 1998-2000. 2001 National HIV Prevention Conference . 8-12-2001.

Cross, GD and Schalla, W. O. Advances in T-Lymphocyte Immunophenotyping and Absolute CD4 T-cell count Determinations. Association of Public Health Laboratories Conference on Laboratory Aspects of Human Retrovirus and Hepatitis C Testing. 2000.

Cross, GD, Schalla, W. O., Taylor, R. N., and Handsfield, JH. Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping (TLI) in support of HIV-1 Infected Patient Care and Management. Clinical Applications of Cytometry, 9th Annual Meeting . 1994.

Blumer, S. O., Schalla, W. O., and Fehd, R. J. Performance of Laboratories Using Rapid and/or Simplified Methodology to Test for HIV-1 Antibody in Six CDC Model Performance Evaluation Program Surveys. 11th Annual Conference On Human Retrovirus Testing (ASTPHLD) . 1996.

Blumer, S. O., Schalla, W. O., and Fehd, R. J. Intra-Shipment Reproducibility of HIV-1 Western Blot (WB) Results Reported in Ten Shipment Periods by Laboratories Participating in the Centers for Disease Control (CDC) Model Performance Evaluation Program (MPEP). Third National Conference on Human Retrovirus and Related Infections . 1997.

Blumer, S. O., Schalla, W. O., and Fehd, R. J. Inter-Shipment Reproducibility of HIV-1 Testing Results Reported by Laboratories Participating in the Centers for Disease Control (CDC) Model Performance Evaluation Program (MPEP). 12th Annual Conference on Human Retrovirus Testing . 1997.

Williams, L, Blumer, S. O., Schalla, W. O., Robinson, P. H., Handsfield, JH, Fehd, R. J., Hancock, J., Lipman, HB, and Hearn, T. L. Laboratory Performance in Human T-Lymphotropic Virus Types I/II (HTLV-I/II) Analyses. 97th Annual Meeting of the American Society for Microbiology . 1997.

Schalla, W. O. Analysis of Results Reported By Laboratories Participating in the CDC Model Performance Evaluation Program for HIV-1 RNA Determinations. Consortium for Retrovirus Serology Standardization Annual Meeting . 1997.

Blumer, S. O., Schalla, W. O., Hearn, T. L, and Fehd, R. J. Analysis of p24 Antigen Testing Results Reported to the CDC Model Performance Evaluation Program By Laboratories Participating in the June 1997 Survey. 13th Annual Conference on Human Retrovirus Testing . 1997.

Schalla, W. O., Blumer, S. O., Hearn, T. L, and Fehd, R. J. Analysis of Results Reported By Laboratories Participating in the CDC Model Performance Evaluation Program for HIV-1 RNA Determinations. 13th Annual Conference on Human Retrovirus Testing . 1997.

Blumer, S. O., Schalla, W. O., Hearn, T. L, and Fehd, R. J. Evaluation of Laboratory Performance in Determining HIV-1 RNA Levels Present in CDC Performance Evaluation Samples. 12th World AIDS Conference . 1998.

Schalla, W. O. Algorithm for HIV-1 Antibody Testing: Data from a Model Performance Evaluation Program. 9th ASTPHLD Conference on Human Retrovirus Testing . 1994.

Blumer, S. O., Handsfield, JH, and Schalla, W. O. Intershipment Reproducibility of HIV-1 Western Blot Results Reported in Five Paired Shipment Periods by Laboratories Participating in the Centers for Disease Control and Prevention (CDC) Model Performance Evaluation Program. 9th ASTPHLD Conference on Human Retrovirus Testing . 1994.

Cross, GD, Schalla, W. O., Taylor, R. N., and Handsfield, JH. Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping (TLI) In Support of HIV-1 Infected Patient Care and Management. 9th ASTPHLD Conference on Human Retrovirus Testing . 1994.

Hearn, T. L, Schalla, W. O., and Collins, C. L. The Centers for Disease Control and Prevention Model Performance Evaluation Program for HIV-1 Antibody Testing. WHO Consultation Meeting On The Coordination of Quality Assessment Programmes For HIV Testing . 1995.

Blumer, S. O. and Schalla, W. O. Performance of Laboratories Testing HIV-1 Seroconversion Samples in the CDC Model Performance Evaluation Program August 1994 Survey Panels. 10th Annual Conference On Human Retrovirus Testing (ASTPHLD) . 1995.

Cross, GD, Schalla, W. O., Taylor, R. N., Siragusa, M. T., Cohn, R. D., Gaunt, E. E., and Holzworth, D. A. Reliability of Absolute CD4 Counts Between Laboratories: Results From A Pilot Study. Clinical Cytometry Tenth Annual Meeting . 1995.

Schalla, W. O., Cross, GD, Taylor, R. N., Siragusa, M. T., Cohn, R. D., Borowitz, M. J., Bray, R. A., Hurtubise, P. E., Jackson, A. L, Koepke, J. A., Landay, A., Nicholson, J. K. A., Rickman, W. J., and Stelzer, G. T. Determination of CD4+ Absolute Counts: Some Factors Affecting Hematology Analyzer Results. 2nd National Conference on CD4+ T-Lymphocyte Immunophenotyping . 1995.

Schalla, W. O. Centers for Disease Control and Prevention (CDC) Model Performance Evaluation Program (MPEP): Enzyme Immunoassay and Western Blot Testing Errors. 11th Annual Conference On Human Retrovirus Testing (ASTPHLD) . 1996.

Cross, GD, Schalla, W. O., Hancock, J., and Hearn, T. L. Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention and Prevention. 5th National Forum on AIDS . 1992.

Collins, C. L., Cross, GD, Schalla, W. O., Hancock, J., and Hearn, T. L. Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention and Prevention. VIII International Conference on AIDS . 1992.

Schalla, W. O., Cross, GD, Blumer, S. O., Hearn, T. L, and Collins, C. L. T-Lymphocyte Immunophenotyping (TLI): Characteristics of Laboratories Enrolled in the CDC Model Performance Evaluation Program. 8th ASTPHLD Conference on Human Retrovirus Testing . 1993.

Blumer, S. O., Schalla, W. O., Handsfield, JH, Hancock, J., Cross, GD, and Hearn, T. L. Serologic Testing for HIV-1: Western Blot (WB) Testing and Inconsistent Interpretation of WB Results in a Model Performance Evaluation Program (MPEP). 8th ASTPHLD Conference on Human Retrovirus Testing . 1993.

Cross, GD, Schalla, W. O., Handsfield, JH, Blumer, S. O., and Hearn, T. L. Performance Evaluation of Laboratories Conducting T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention and Management of HIV-1-Infected Patients. 8th ASTPHLD Conference on Human Retrovirus Testing . 1993.

Blumer, S. O., Schalla, W. O., Handsfield, JH, Hancock, J., Cross, GD, and Hearn, T. L. Serologic Testing for HIV-1: Status of Western Blot (WB) Testing and Inconsistent Interpretation of WB Testing Results in a Model Performance Evaluation Program (MPEP) - 1989-1992. IX International Conference on AIDS . 1993.

Schalla, W. O., Cross, GD, Blumer, S. O., Hearn, T. L, and Collins, C. L. HIV/AIDS: Characteristics of Laboratories Enrolled in a T-Lymphocyte Immunophenotyping (TLI) Model Performance Evaluation Program (MPEP) and Their Testing Practices. IX International Conference on AIDS . 1993.

Cross, GD, Schalla, W. O., Handsfield, JH, Blumer, S. O., Hearn, T. L, and Collins, C. L. Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping (TLI) in Support of Early HIV-1 Intervention and Management of HIV-1-Infected Patients. IX International Conference on AIDS . 1993.

Schalla, W. O. Performance Evaluation and Proficiency Testing: Model Performance Evaluation Program. National Conference on T-Lymphocyte Immunophenotyping . 1993.

Blumer, S. O. Serologic Testing for HIV-1: Western Blot (WB) Testing and Inconsistent Interpretation of WB Results in a Model Performance Evaluation Program. Consortium for Retrovirus Serology Standardization . 1993.

Schalla, W. O. Objectives of the MPEP and Recent Data from the TLI Survey Questionnaire and Specimen Testing Results. Clinical Applications of Cytometry Annual Meeting . 1993.

Handsfield, JH, Schalla, W. O., Blumer, S. O., and Hearn, T. L. Testing for HIV-1 Antibody (Ab): Discrepancies in Western Blot (WB) Interpretations Reported in a Model Performance Evaluation Program (MPEP). American Public Health Association 121st Annual Meeting . 1993.

Blumer, S. O., Schalla, W. O., Handsfield, JH, Hancock, J., and Hearn, T. L. HIV-1 Western Blot (WB) Testing: Errors in Interpretation of WB Testing Results in a Model Performance Evaluation Program (MPEP). First National Conference on Human Retroviruses and Related Infections . 1993.

Cross, GD, Schalla, W. O., Taylor, R. N., Handsfield, JH, Hearn, T. L, and Collins, C. L. Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping (TLI) in Support of HIV-1 Infected Patient Intervention and Management. First National Conference on Human Retroviruses and Related Infections . 1993.

Schalla, W. O., Cross, GD, Taylor, R. N., Hall-Dean, J., Hearn, T. L, and Collins, C. L. Testing Trends in the T-Lymphocyte Immunophenotyping (TLI) Laboratory: Data from a National Performance Evaluation (PE) Program. First National Conference on Human Retroviruses and Related Infections . 1993.

Blumer, S. O., Schalla, W. O., Cross, GD, Hancock, J., Muir, H. W., and Hearn, T. L. Analysis of Indeterminate Human T-lymphotropic Virus Type I (HTLV-I) Western Blot Interpretations Reported for HTLV-Type II Infected Individuals. VII International Conference on AIDS . 1991.

Schalla, W. O. Performance Evaluation for CD4+ Cell Testing. Centers for Disease Control and Prevention AIDS Update . 1991.

Cross, GD, Schalla, W. O., Hancock, J., and Hearn, T. L. Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention and Prevention. 7th ASTPHLD Conference on Human Retrovirus Testing . 1992.

Blumer, S. O., Schalla, W. O., Cross, GD, Gerber, A. R., Hancock, J., and Hearn, T. L. Evaluation of the Performance of Laboratories that Test for Human T-lymphotropic Virus Antibodies. 6th ASTPHLD Consensus Conference . 1991.

Cross, GD, Schalla, W. O., Blumer, S. O., Hancock, J., Gerber, A. R., and Hearn, T. L. Inter-shipment Reproducibility of Laboratories Participating in a Performance Evaluation Program. 6th ASTPHLD Consensus Conference . 1991.

Blumer, S. O., Schalla, W. O., Cross, GD, Hearn, T. L, Howerton, D. A., and Valdiserri, R. O. Assessment of Human T-lymphotropic Virus Types I and II Antibody Testing. American Society for Microbiology Meeting . 1991.

Cross, GD, Schalla, W. O., Blumer, S. O., Hearn, T. L, and Valdiserri, R. O. Human Immunodeficiency Virus Type 1 (HIV-1) Antibody Testing: Analytic Sensitivity and Analytic Specificity of Enzyme Immunoassay (EIA) Results. American Society for Microbiology Meeting . 1991.

Schalla, W. O., Cross, GD, Blumer, S. O., Hancock, J., Gerber, A. R., Muir, H. W., and Hearn, T. L. Update on Western Blot Testing: Performance Evaluation of Laboratories that Test for Human Immunodeficiency Virus Type 1 (HIV-1) Antibodies. VII International Conference on AIDS . 1991.

Cross, GD, Schalla, W. O., Blumer, S. O., Taylor, R. N., Gerber, A. R., Hearn, T. L, and Valdiserri, R. O. Analytic Sensitivity and Specificity of Enzyme Immunoassay Results in Testing for Human Immunodeficiency Virus Type 1 (HIV-1) Antibody. VII International Conference on AIDS . 1991.

Schalla, W. O., Hearn, T. L, Taylor, R. N., Griffin, C. W., Muir, H. W., and Wood, R. J. Centers for Disease Control Model Performance Evaluation Program: Results of the Western Blot and Indirect Immunofluorescence Tests for HIV-1 Antibodies. V International Conference on AIDS . 1989.

Hearn, T. L, Schalla, W. O., Taylor, R. N., Muir, H. W., Griffin, C. W., and Wood, R. J. Evaluation of Laboratory Performance of Enzyme Immunoassay Tests for HIV-1 Antibody. V International Conference on AIDS . 1989.

Schalla, W. O. Centers for Disease Control: Model Performance Evaluation Program for HIV-1 Testing. Second Annual Meeting of AIDS Laboratory Directors . 1989.

Blumer, S. O. Overview of Results from CDC's First Performance Evaluation Survey for HTLV-I/II Antibody Testing. Sixth Consortium for Retrovirus Serology Standardization . 1990.

Schalla, W. O., Hearn, T. L, Cross, GD, Blumer, S. O., Taylor, R. N., and Valdiserri, R. O. Human Immunodeficiency Virus Type-1 (HIV-1) Antibody Testing: Accuracy of Western Blot Results. Sixth International AIDS Conference . 1990.

Cross, GD, Schalla, W. O., Hearn, T. L, Blumer, S. O., Taylor, R. N., and Valdiserri, R. O. Analytic Sensitivity and Specificity of Enzyme Immunoassay Results in Testing for Human Immunodeficiency Virus Type 1 (HIV-1) Antibody. Sixth International AIDS Conference . 1990.

Blumer, S. O., Hearn, T. L, Schalla, W. O., Cross, GD, and Valdiserri, R. O. Assessment of Human T-Cell Lymphotrophic Virus Type I/II Antibody Testing. Sixth International AIDS Conference . 1990.

Blumer, S. O. Observations on Western Blot Results and Interpretations Reported in Testing HIV-1 Performance Evaluation Samples. Fifth Consortium for Retrovirus Serology Standardization . 1989.

Taylor, R. N. HIV Testing Quality Indicators: Information from CDC's Model Performance Evaluation Program. CDC/TLPO Training Course on HIV-1 Tests . 1989.

Taylor, R. N., Hearn, T. L, Griffin, C. W., Schalla, W. O., and Muir, H. W. Results of CDC's Model Performance Evaluation Program for HIV-1 Antibody Testing. V International Conference on AIDS . 1989.

Blumer, S. O., Schalla, W. O., Hearn, T. L, and Fehd, R. J. Analysis of p24 Antigen Testing Results Reported to the CDC Model Performance Evaluation Program by Laboratories Participating in the June 1997 and March 1998 Surveys. CDC Conference on the Laboratory Science of HIV . 1998.

Blumer, S. O., Schalla, W. O., Hearn, T. L, and Fehd, R. J. Evaluation of Laboratory Performance in Determining HIV-1 RNA Levels Present in CDC Performance Evaluation Samples. CDC Conference on the Laboratory Science of HIV . 1998.

Cross, GD, Handsfield, JH, and Schalla, W. O. Comparison of Absolute CD4 T-Cell Counts, Multi-Platform vs. Single Platform Methods: Results from a Performance Evaluation Program. Clinical Applications of Cytometry, 13th Annual Meeting . 1998.

Cross, GD, Handsfield, JH, and Schalla, W. O. Comparison of Absolute CD4 and CD8 T-Cell Results Measured by Multi-Platform and Single Platform Methods. CDC Conference on the Laboratory Science of HIV . 1998.

Blumer, S. O., Schalla, W. O., Hearn, T. L, and Fehd, RJ. Evaluation of Laboratory Performance in Determining HIV-1 RNA Levels Present in CDC Performance Evaluation Samples. 12th World AIDS Conference . 1999. 2000.

Cross, GD, Handsfield, JH, and Schalla, W. O. CD4 T-Cell Enumeration: Single-Platform Methods May Yield More Reproducible Results Than Multi-Platform Methods. 14th Annual Meeting of the Clinical Applications of Cytometry . 1999.

Cross, GD and Schalla, W. O. Advances in T-lymphocyte Immunophenotyping and Absolute CD4 T-Cell Count Determination. National HIV Prevention Conference . 1999.

Hearn, T. L, Schalla, W. O., Blumer, S. O., Handsfield, JH, Fehd, R. J., Hancock, J., and Simon, M. K. Western Blot Testing: Laboratory Performance. FDA's Blood Products Advisory Committee . 2000.

Schalla, W. O. Update: Viral Load Testing In The United States. Consortium for Retrovirus Serology Standardization. 2000.

Schalla, W. O., Blumer, S. O., and Hearn, T. L. HIV-1 RNA Testing In The United States: Observations From A Performance Evaluation Program. Conference on Laboratory Aspects of Human Retrovirus and Hepatitis C Testing sponsored by the Association of Public Health Laboratories (APHL) . 2000.

Schalla, W. O. and Hearn, T. L. Implementation of a Viral Load Performance Evaluation Program and A Current Overview of the Model Performance Evaluation Program. HIV/AIDS Update, NCHSTP . 2000.

Schalla, W. O. and Hearn, T. L. Laboratory Issues Related to Viral Load Testing. Meeting for Standardization of Viral Load Reporting (Representatives from CDC, FDA, NIH, CAP, SDSU, AABB, APHL). 1999.

Stankovic, A, Schalla, W. O., Blumer, S. O., and Handsfield, JH. CDC's Model Performance Evaluation Program (MPEP): Analysis of Human Immunodeficiency Virus Antibody (HIV-1 Ab) Results. 52nd Annual Meeting of the American Association of Blood Banks . 1999.

Stankovic, A, Rosner, E, Handsfield, JH, Cross, GD, and Schalla, W. O. Impact of CDC's Model Performance Evaluation Program (MPEP) for T-Lympocyte Immunophenotyping (TLI) on Laboratory Practices. 14th Annual Meeting of the Clinical Applications of Cytometry . 1999.

Schalla, W. O., Blumer, S. O., and Hearn, T. L. HIV-1 RNA Testing In the United States: Observations from a Performance Evaluation Program. 1999 Conference on HIV Prevention . 1999.

Stankovic, A, Astles, JR, Schalla, W. O., Ridderhof, J. C., and Hearn, T. L. Model Performance Evaluation Program (MPEP). Academy for Clinical Laboratory Scientists and Physicians . 1999.

Schalla, W. O., Blumer, S. O., and Hearn, T. L. HIV-1 RNA Testing In the United States: Observations from a Performance Evaluation Program. 14th Annual Conference on Human Retrovirus Testing . 1999.

Regulatory Mechanisms for Assuring the Quality of HIV Testing. R.N Taylor. [Round table presentation February 1988 at the First Pan American Conference on AIDS in Guadalajara, Mexico]

CDC's Model Performance Evaluation Program for HIV Testing. C.W. Griffin. [Presented March 9, 1988 at ASTPHLD'S Third Consensus Conference on HIV Testing in Kansas City, Missouri]

Use of HIV Reference Sera in Mailed Performance Evaluation Surveys in the United States. T.L. Hearn, R.N. Taylor, C.W. Griffin, M.A. Robinson, R.J. Wood, H.W. Muir, and G. Elwell. [Presented June 1988 at the IV International Conference on AIDS in Stockholm, Sweden]

Testing for HIV Infection in the United States: Evaluating Laboratory Performance. R.N. Taylor, C.W. Griffin, T.L. Hearn, M.A. Robinson, R.J. Wood, H.W. Muir, and G. Elwell. [Presented June 1988 at the IV International Conference on AIDS in Stockholm, Sweden]

CDC Model Performance Evaluation Program for HIV Testing. C.W. Griffin. [Presented June 8, 1988, at the 31st Annual Planning Conference, ASTPHLD, Nashville, TN]

CDC Laboratory Assessment Program. C.W. Griffin. [Presented June 10, 1988 at the Plasma Forum '88, American Blood Resources Association, Arlington, VA]

Quality Assurance. D.J. Boone. [Presented August 9-11, 1988 at the Canadian Federal Center on AIDS and PAHO "Workshop on HIV Serology" in Ottawa, Canada]

Components of the Performance Evaluation Program and Their Development. C.W. Griffin. [Presented August 18, 1988 at the CDC AIDS Rounds, "HIV Antibody Testing: Laboratory Performance Evaluation Update"]

Latest Analysis of Data from the February 29 Pilot Shipment. R.N. Taylor. [Presented August 18, 1988 at the CDC AIDS Rounds, "HIV Antibody Testing: Laboratory Performance Evaluation Update"]

Participant Responses to the Questionnaire Mailed to 1,400 Laboratories in May 1988. W.O. Schalla. [Presented August 18, 1988 at the CDC AIDS Rounds, "HIV Antibody Testing: Laboratory Performance Evaluation Update"]

Report on CDC Performance Evaluation Testing. R.N. Taylor. [Presented September 9, 1988 at the Consortium for Retrovirus Serology Standardization meeting entitled "An Update of HIV-1 and HTLV-I Serology" in Yountville, California.]

A Laboratory Quality Assurance Program to Improve HIV Antibody Testing. K.M. Peddecord, A.S. Benenson, L.K. Hofherr, M.S. Ascher, and R.N. Taylor. [Presented September 22-24, 1988 at the 1988 International Symposium on Medical Virology in San Francisco, California]

Quality Assurance Program: Clinic-Based Surveys. T.L. Hearn. [Presented on March 1, 1989 at CDC's HIV Seroprevalence Workshop for Laboratory Issues]

CDC Model Performance Evaluation Program Questionnaire and Sample Survey Results. R.N. Taylor, T.L. Hearn, W.O. Schalla, E. Eavenson, and R.O. Valdiserri. [Presented on March 7-9, 1989 at the Fourth Consensus Conference on Testing for Human Retroviruses of the ASTPHLD in Kansas City, Missouri]

HIV Antibody Testing Reporting Practices, Evidence from a Blind Proficiency Testing Study. Draft Criteria and Recommendations for Reporting HIV Antibody Test Results. K.M. Peddecord, A.S. Beneson, L.K. Hofherr, M.S. Ascher, R.N. Taylor, K.L. Ferran, and D.P. Francis. [Presented on March 7-9, 1989 at the Fourth Consensus Conference on Testing for Human Retroviruses of the ASTPHLD in Kansas City, Missouri]

Evaluating and Improving External Monitoring and Surveillance Systems. L.K. Hofherr, K.M. Peddecord, A.S. Beneson, M.S. Ascher, R.N. Taylor, and T.L. Hearn. [Presented on April 10-12, 1989 at the Institute on Critical Issues in Minneapolis, Minnesota]

Observations on Western Blot Results and Interpretations Reported in Testing HIV-1 Performance Evaluation Samples. S.O. Blumer. [Presented April 11-13, 1989 at the Fifth Consortium for Retrovirus Serology Standardization, Seattle, Washington]

CDC's Model Performance Evaluation Program (HIV-1) Testing - Program Overview. H.W. Muir. [Presented in May 1989 at the Georgia Society for Medical Technology meeting in Atlanta, GA]

HIV Testing Quality Indicators: Information from CDC's Model Performance Evaluation Program. R.N. Taylor. [Presentation on May 11, 1989 for CDC/TLPO Training Course on HIV-1 Tests]

Results of CDC's Model Performance Evaluation Program for HIV-1 Antibody Testing. R.N. Taylor, T.L. Hearn, C.W. Griffin, W.O. Schalla, and H.W. Muir. [Presented June 4-9, 1989 at the V International Conference on AIDS in Montreal, Canada]

Evaluation of Laboratory Performance of Enzyme Immunoassay Tests for HIV-1 Antibody. T.L. Hearn, W.O. Schalla, R.N. Taylor, H.W. Muir, C.W. Griffin, and R.J. Wood. [Presented June 4-9, 1989 at the V International Conference on AIDS in Montreal, Quebec, Canada]

Centers for Disease Control Model Performance Evaluation Program: Results of the Western Blot and Indirect Immunofluorescence Tests for HIV-1 Antibodies. W.O. Schalla, T.L. Hearn, R.N. Taylor, C.W. Griffin, H.W. Muir, and R.J. Wood. [Presented June 4-9, 1989 at the V International Conference on AIDS in Montreal, Quebec, Canada]

The Application of Health Care Technology in Practice - The Ideal Versus the Standard of Practice (Reality): The Case of HIV Antibody Testing. K.M. Peddecord, A.S. Beneson, and L.O. Hofherr. [Presented on June 5-6, 1989 at the International Society of Technical Assessment of Health Care conference in London, England]

HIV Testing Quality Indicators: Information from CDC's Model Performance Evaluation Program. A.R. Gerber. [Lecture presented on October 2-6, 1989 as part of CDC Course #9485-C "Assays for HIV Antibodies and Antigens: Present and Future" Atlanta, Georgia]

HIV Testing Quality Indicators: Information from CDC's Model Performance Evaluation Program. A.R. Gerber. [Presented on October 5, 1989 at CDC/TLPO Training Course on HIV-1 Tests]

Assessment of the Usefulness of Laboratory Tests in Primary Health Care of Developing Countries. T.L. Hearn, R.O. Valdiserri, and J.D.K. Essien. [Presented on October 23-27, 1989 at the Meeting on Development of Appropriate Laboratory Technology to Support Primary Health Care, Geneva, Switzerland]

Centers for Disease Control: Model Performance Evaluation Program for HIV-1 Testing. W.O. Schalla. [Presented on November 16-19, 1989 at the Second Annual Meeting of AIDS Laboratory Directors, Santo Domingo, Dominican Republic]

The CDC Model Performance Evaluation Program. W.O. Schalla. [Presented February 5, 1990 to the National Conference of State Legislators, Atlanta, Georgia]

Overview of Results from CDC's First Performance Evaluation Survey for HTLV-I/II Antibody Testing. S.O. Blumer. [Presented on February 9, 1990 at the Sixth Consortium for Retrovirus Serology Standardization in Sacramento, California]

Quality Assurance in State Public Health Laboratories - Report of the CDC Survey. R.O. Valdiserri. [Presented on March 6-8, 1990 at the Fifth Consensus Conference on Testing for Human Retroviruses, Kansas City, Missouri]

Demonstration of the Laboratory Performance Information Exchange System. R.N. Taylor, W.O. Schalla, T.L. Hearn, H.W. Muir, and R.O. Valdiserri. [Demonstrated on March 6-8, 1990 at the Fifth Consensus Conference on Testing for Human Retroviruses, Kansas City, Missouri]

Accuracy of Western Blot Testing for Human Immunodeficiency Virus Type 1 (HIV-1) Infection. W.O. Schalla, G.D. Cross, T.L. Hearn, S.O. Blumer, R.N. Taylor, and R.O. Valdiserri. [Presented on May 13-17, 1990 at the 1990 American Society for Microbiology Annual Meeting in Anaheim, California]

HIV-1 Antibody Testing Practices in the Nation's Laboratories. T.L. Hearn. [Presented May 17, 1990 at CDC AIDS Rounds, Atlanta, Georgia]

Laboratory Performance Variables for HIV-1 Antibody Testing. A.R. Gerber. [Presented May 17, 1990 at CDC AIDS Rounds, Atlanta, Georgia]

Human Immunodeficiency Virus Type-1 (HIV-1) Antibody Testing: Accuracy of Western Blot Results. W.O. Schalla, T.L. Hearn, G.D. Cross, S.O. Blumer, R.N. Taylor, and R.O. Valdiserri. [Presented on June 20-24, 1990 at the Sixth International AIDS Conference at San Francisco, California]

Analytic Sensitivity and Specificity of Enzyme Immunoassay Results in Testing for Human Immunodeficiency Virus Type 1 (HIV-1) Antibody. G.D. Cross, W.O. Schalla, T.L. Hearn, S.O. Blumer, R.N. Taylor and R.O. Valdiserri. [Presented on June 20-24, 1990 at the Sixth International AIDS Conference at San Francisco, California]

Assessment of Human T-Cell Lymphotrophic Virus Type I/II Antibody Testing. S.O. Blumer, T.L. Hearn, W.O. Schalla, G.D. Cross, and R.O. Valdiserri. [Presented on June 20-24, 1990 at the Sixth International AIDS Conference at San Francisco, California]

National Capacity for Providing T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention. R.O. Valdiserri, G.D. Cross, A.R. Gerber, T.L. Hearn, and R.E. Schwartz. [Presented on June 20-24, 1990 at the Sixth International AIDS Conference at San Francisco, California]

Association of Performance on EIA for HIV-1 Antibody with Laboratory Characteristics and Testing Practices. A.R. Gerber, C.A. Johnson, R.E. Schwartz, T.L. Hearn, and R.O. Valdiserri. [Presented on June 20-24, 1990 at the Sixth International AIDS Conference at San Francisco, California]

Demonstration of the Laboratory Performance Information Exchange System. R.N. Taylor, T.L. Hearn, H.W. Muir, W.O. Schalla, and R.O. Valdiserri. [Demonstrated on June 20-24, 1990 at Sixth International AIDS Conference at San Francisco, California]

Evaluation of the Performance of Laboratories that Test for Human T-lymphotropic Virus Antibodies. S.O. Blumer, W.O. Schalla, G.D. Cross, A.R. Gerber, J.S. Hancock, and T.L. Hearn. [Presented on March 4-7, 1991 at the 6th ASTPHLD Consensus Conference in Kansas City, Missouri]

Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention and Prevention. A.R. Gerber, G.D. Cross, W.O. Schalla, J.S. Hancock, S.O. Blumer, and T.L. Hearn. [Presented on March 4-7, 1991 at the 6th ASTPHLD Consensus Conference in Kansas City, Missouri]

Inter-shipment Reproducibility of Laboratories Participating in a Performance Evaluation Program. G.D. Cross, W.O. Schalla, S.O. Blumer, J.S. Hancock, A.R. Gerber, and T.L. Hearn. [Presented on March 4-7, 1991 at the 6th ASTPHLD Consensus Conference in Kansas City, Missouri]

What Do Human T-lymphocyte Immunophenotyping Reports Contain? Results of a Case-Series. K.M. Peddecord, A.S. Benenson, D.P. Francis, D.J. Hewitt, R.S. Garfein, L.K. Hofherr, A.R. Gerber, G.D. Cross, and W.O. Schalla. [Presented in March 4-7, 1991 at the 6th ASTPHLD Consensus Conference in Kansas City, Missouri]

Assessment of Human T-lymphotropic Virus Types I and II Antibody Testing. S.O. Blumer, W.O. Schalla, G.D. Cross, T.L. Hearn, D.A. Howerton, and R.O. Valdiserri. [Presented in May 1991 at the American Society for Microbiology Meeting in Dallas, Texas]

Human Immunodeficiency Virus Type 1 (HIV-1) Antibody Testing: Analytic Sensitivity and Analytic Specificity of Enzyme Immunoassay (EIA) Results. G.D. Cross, W.O. Schalla, S.O. Blumer, T.L. Hearn, and R.O. Valdiserri. [Presented in May 1991 at the American Society for Microbiology Meeting in Dallas, Texas]

Update on Western Blot Testing: Performance Evaluation of Laboratories that Test for Human Immunodeficiency Virus Type 1 (HIV-1) Antibodies. W.O. Schalla, G.D. Cross, S.O. Blumer, J.S. Hancock, A.R. Gerber, H.W. Muir, and T.L. Hearn. [Presented on June 16-21, 1991 at the VII International Conference on AIDS in Florence, Italy]

Analytic Sensitivity and Specificity of Enzyme Immunoassay Results in Testing for Human Immunodeficiency Virus Type 1 (HIV-1) Antibody. G.D. Cross, W.O. Schalla, S.O. Blumer, R.N. Taylor, A.R. Gerber, T.L. Hearn, and R.O. Valdiserri. [Presented on June 16-21, 1991 at the VII International Conference on AIDS in Florence, Italy]

Correlation Between Laboratory Personnel Parameters and the Quality of HIV-1 Antibody Testing in U.S. Laboratories. T.L. Hearn, R.O. Valdiserri, C.A. Johnson, J.S. Hancock, R.E. Schwartz, and A.R. Gerber. [Presented on June 16-21, 1991 at the VII International Conference on AIDS in Florence, Italy]

Analysis of Indeterminate Human T-lymphotropic Virus Type I (HTLV-I) Western Blot Interpretations Reported for HTLV-Type II Infected Individuals. S.O. Blumer, W.O. Schalla, G.D. Cross, J.S. Hancock, H.W. Muir, and T.L. Hearn. [Presented on June 16-21, 1991 at the VII International Conference on AIDS in Florence, Italy]

Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention and Prevention. A.R. Gerber, G.D. Cross, W.O. Schalla, J.S. Hancock, H.W. Muir, T.L. Hearn, and R.O. Valdiserri. [Presented on June 16-21, 1991 at the VII International Conference on AIDS in Florence, Italy]

Analytic Specificities and Sensitivities of Indirect Immunofluorescence Results in Testing for Human Immunodeficiency Virus Type 1 (HIV-1) Antibody for 1988 to 1990. R.N. Taylor, G.D. Cross, S.O. Blumer, A.R. Gerber, W.O. Schalla, and T.L. Hearn. [Presented on June 16-21, 1991 at the VII International Conference on AIDS in Florence, Italy]

Performance Evaluation for CD4+ Cell Testing. W.O. Schalla. [Presented on October 11, 1991 at CDC AIDS Update]

Accuracy and Precision of T-Lymphocyte Immunophenotyping: Results of a Blind Inter-laboratory Survey. K.M. Peddecord, R.S. Garfein, D.P. Francis, G.D. Cross, W.O. Schalla, A.S. Benenson, and L.K. Hofherr. [Presented March, 1992 at the 7th ASTPHLD Conference on Human Retrovirus Testing in Chicago, Illinois]

Shopping for a TLI Reference Laboratory - Criteria for Selecting the Best. D.P. Francis, K.M. Peddecord, A.F. Back, R.S. Garfein, L.K. Hofherr, A.S. Benenson, G.D. Cross, and R.N. Taylor. [Presented March, 1992 at the 7th ASTPHLD Conference on Human Retrovirus Testing in Chicago, Illinois]

Testing for HTLV Antibody: Results of the Centers for Disease Control HTLV Survey Questionnaire. S.O. Blumer, W.O. Schalla, J.S. Hancock, A.L. Glaude, and R.J. Fehd. [Presented March, 1992 at the 7th ASTPHLD Conference on Human Retrovirus Testing in Chicago, Illinois]

Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention and Prevention. G.D. Cross, W.O. Schalla, J.S. Hancock, and T.L. Hearn. [Presented March, 1992 at the 7th ASTPHLD Conference on Human Retrovirus Testing in Chicago, Illinois]

Accuracy and Precision of T-Lymphocyte Immunophenotyping: Results of a Blind Inter-Laboratory Survey. K.M. Peddecord, R.S. Garfein, D.P. Francis, A.S. Benenson, L.K. Hofherr, J.L. Cross, G.D. Cross, and W.O. Schalla. [Presented April, 1992 at the 5th National Forum on AIDS in Atlanta, Georgia]

Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention and Prevention. G.D. Cross, W.O. Schalla, J.S. Hancock, and T.L. Hearn. [Presented April, 1992 at the 5th National Forum on AIDS in Atlanta, Georgia]

Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention and Prevention. C.L. Collins, G.D. Cross, W.O. Schalla, J.S. Hancock, and T.L. Hearn. [Presented in June, 1992 at the VIII International Conference on AIDS in Amsterdam, The Netherlands.]

T-Lymphocyte Immunophenotyping (TLI): Characteristics of Laboratories Enrolled in the CDC Model Performance Evaluation Program. W.O. Schalla, G.D. Cross, S.O. Blumer, T.L. Hearn, and C.L. Collins. [Presented March 3-5, 1993, at the 8th ASTPHLD Conference on Human Retrovirus Testing in Atlanta, Georgia]

Serologic Testing for HIV-1: Western Blot (WB) Testing and Inconsistent Interpretation of WB Results in a Model Performance Evaluation Program (MPEP). S.O. Blumer, W.O. Schalla, J.H. Handsfield, J.S. Hancock, G.D. Cross, and T.L. Hearn. [Presented March 3-5, 1993, at the 8th ASTPHLD Conference on Human Retrovirus Testing in Atlanta, Georgia]

Performance Evaluation of Laboratories Conducting T-Lymphocyte Immunophenotyping in Support of Early HIV-1 Intervention and Management of HIV-1-Infected Patients. G.D. Cross, W.O. Schalla, J.H. Handsfield, S.O. Blumer, and T.L. Hearn. [Presented March 3-5, 1993, at the 8th ASTPHLD Conference on Human Retrovirus Testing in Atlanta, Georgia]

Results of T-Lymphocyte Immunophenotyping and Blind Proficiency Testing. K.M. Peddecord, A.S. Benenson, L.K. Hofherr, D.P. Francis, R.S. Garfein, R.N. Taylor, W.O. Schalla, G.D. Cross, J. Rau, and J.L. Cross. [Presented March 3-5, 1993 at the 8th ASTPHLD Conference on Human Retrovirus Testing in Atlanta, Georgia]

Serologic Testing for HIV-1: Status of Western Blot (WB) Testing and Inconsistent Interpretation of WB Testing Results in a Model Performance Evaluation Program (MPEP) - 1989-1992. S.O. Blumer, W.O. Schalla, J.H. Handsfield, J.S. Hancock, G.D. Cross, and T.L. Hearn. [Presented June 7-11, 1993 at the IX International Conference on AIDS in Berlin, Germany]

HIV/AIDS: Characteristics of Laboratories Enrolled in a T-Lymphocyte Immunophenotyping (TLI) Model Performance Evaluation Program (MPEP) and Their Testing Practices. W.O. Schalla, G.D. Cross, S.O. Blumer, T.L. Hearn, and C.L. Collins. [Presented June 7-11, 1993 at the IX International Conference on AIDS in Berlin, Germany]

Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping (TLI) in Support of Early HIV-1 Intervention and Management of HIV-1-Infected Patients. G.D. Cross, W.O. Schalla, J.H. Handsfield, S.O. Blumer, T.L. Hearn, and C.L. Collins. [Presented June 7-11, 1993 at the IX International Conference on AIDS in Berlin, Germany]

Clinician Practices in Ordering T-Lymphocyte Immunophenotyping (TLI) and Use of TLI Results in the Care and Management of HIV-1 Infected Patients. C.L. Collins, W.O. Schalla, G.D. Cross, T.L. Hearn, and S.O. Blumer. [Presented June 7-11, 1993 at the IX International Conference on AIDS in Berlin, Germany]

CD4+ T-Lymphocyte Testing in the Nation's Laboratories. T.L. Hearn. [Presented June 23, 1993 at the National Conference on T-Lymphocyte Immunophenotyping in Atlanta, Georgia]

Clinician Usage of CD4+ T-Lymphocyte Testing. C.L. Collins. [Presented June 23, 1993 at the National Conference on T-Lymphocyte Immunophenotyping in Atlanta, Georgia]

Performance Evaluation and Proficiency Testing: Model Performance Evaluation Program. W.O. Schalla. [Presented June 24, 1993 at the National Conference on T-Lymphocyte Immunophenotyping in Atlanta, Georgia]

Serologic Testing for HIV-1: Western Blot (WB) Testing and Inconsistent Interpretation of WB Results in a Model Performance Evaluation Program. S.O. Blumer. [Presented September 1-3, 1993 at the Consortium for Retrovirus Serology Standardization meeting in Tempe, Arizona]

Description of Lab-Link Computer Based Electronic Information System. R.N. Taylor. [Presented September 1-3, 1993, at the Consortium for Retrovirus Serology Standardization meeting in Tempe, Arizona]

Objectives of the MPEP and Recent Data from the TLI Survey Questionnaire and Specimen Testing Results. W.O. Schalla. [Presented September 15-18, 1993 at the Clinical Applications of Cytometry Annual Meeting in Charleston, South Carolina]

Testing for HIV-1 Antibody (Ab): Discrepancies in Western Blot (WB) Interpretations Reported in a Model Performance Evaluation Program (MPEP). J.H. Handsfield, W.O. Schalla, S.O. Blumer, and T.L. Hearn. [Presented October 24-28, 1993 at the APHA 121st Annual Meeting in San Francisco, California]

CD4+ Cell Counts Versus Percentages: What Should We Use? K.M. Peddecord, A.S. Benenson, L.K. Hofherr, D.P. Francis, R.S. Garfein, R.N. Taylor, W.O. Schalla, G.D. Cross, J. Rau, and J.L. Cross. [Presented October 24-28, 1993 at the APHA 121st Annual Meeting in San Francisco, California]

Testing Practices of Laboratories that Test for HIV Infection: Identification of Trends in the Testing Process. W.O. Schalla, S.O. Blumer, L.A. Cooper, R.J. Fehd, T.L. Hearn, and C.L. Collins. [Presented December 12-16, 1993, at the First National Conference on Human Retroviruses and Related Infections in Washington, DC]

HIV-1 Western Blot (WB) Testing: Errors in Interpretation of WB Testing Results in a Model Performance Evaluation Program (MPEP). S.O. Blumer, W.O. Schalla, J.H. Handsfield, J.S. Hancock, and T.L. Hearn. [Presented December 12-16, 1993, at the First National Conference on Human Retroviruses and Related Infections in Washington, DC]

Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping (TLI) in Support of HIV-1 Infected Patient Intervention and Management. G.D. Cross, W.O. Schalla, R.N. Taylor, J.H. Handsfield, T.L. Hearn, and C.L. Collins. [Presented December 12-16, 1993, at the First National Conference on Human Retroviruses and Related Infections in Washington, DC]

Compliance of Laboratories Performing T-Lymphocyte Immunophenotyping by Flow Cytometry with CDC and NCCLS Guidelines. R.N. Taylor, G.D. Cross, W.O. Schalla, and J.H. Handsfield. [Presented December 12-16, 1993, at the First National Conference on Human Retroviruses and Related Infections in Washington, DC]

Testing Trends in the T-Lymphocyte Immunophenotyping (TLI) Laboratory: Data from a National Performance Evaluation (PE) Program. W.O. Schalla, G.D. Cross, R.N. Taylor, J. Hall-Dean, T.L Hearn, and C.L. Collins. [Presented December 12-16, 1993, at the First National Conference on Human Retroviruses and Related Infections in Washington, DC]

Blind Proficiency Studies for T-Lymphocyte Immunophenotyping. D.P. Francis, K.M. Peddecord, A.S. Benenson, L.K. Hofherr, R.S. Garfein, J. Rau, Q. Xie, D.B. Scarf, G.D. Cross, and W.O. Schalla. [Presented December 12-16, 1993, at the First National Conference on Human Retroviruses and Related Infections in Washington, DC]

Report Content of HIV-1 Antibody Testing Results. K.M. Peddecord, A.S. Benenson, L.K. Hofherr, D.P. Francis, R.S. Garfein, J. Rau, Q. Xie, D.B. Scarf, R.N. Taylor, and W.O. Schalla. [Presented December 12-16, 1993, at the First National Conference on Human Retroviruses and Related Infections in Washington, DC]

Algorithm for HIV-1 Antibody Testing: Data from a Model Performance Evaluation Program. W.O. Schalla. [Oral Program presentation March 2-4, 1994, at the 9th ASTPHLD Conference on Human Retrovirus Testing in Reno, Nevada]

Intershipment Reproducibility of HIV-1 Western Blot Results Reported in Five Paired Shipment Periods by Laboratories Participating in the Centers for Disease Control and Prevention (CDC) Model Performance Evaluation Program. S.O. Blumer, J.H. Handsfield, and W.O. Schalla. [Presented March 2-4, 1994, at the 9th ASTPHLD Conference on Human Retrovirus Testing in Reno, Nevada]

Evaluation of Laboratory Performance of T-Lymphocyte Immunophenotyping (TLI) In Support of HIV-1 Infected Patient Care and Management. G.D. Cross, W.O Schalla, R.N. Taylor, and J.H. Handsfield. [Presented March 2-4, 1994, at the 9th ASTPHLD Conference on Human Retrovirus Testing in Reno, Nevada]

Quality Assurance in HIV-Antibody Testing. W.O. Schalla. [Presented January 17-20, 1995 at the VI Meeting of the Laboratory Directors of National Reference Laboratories in the Americas, Vancouver, British Columbia, Canada.]

Split Patient Specimens: Achieving A More Accurate Measure of HIV-Antibody Testing Performance. W.O. Schalla, S.O. Blumer, R.N. Taylor, T.L. Hearn, E.E. Gaunt, S.K. Seilkop, and D. A. Holzworth. [Presented January 29-February 2, 1995 at the Second National Conference on Human Retroviruses and Related Infections in Washington, DC]

Variable Hematology Results Due To Specimen Alterations Encountered in Developing A Protocol For A T-Lymphocyte Immunophenotyping Proficiency Testing Program. G.D. Cross, W.O. Schalla, R.N. Taylor, E.E. Gaunt, R.D. Cohn, S.K. Seilkop, and D.A. Holzworth. [Presented January 29-February 2, 1995 at the Second National Conference on Human Retroviruses and Related Infections in Washington, DC]

Trends In Compliance of Laboratories Performing T-Lymphocyte Immunophenotyping by Flow Cytometry With CD4-Cell Testing Guidelines. R.N. Taylor, G.D. Cross, W.O. Schalla, and J.H. Handsfield. [Presented January 29-February 2, 1995 at the Second National Conference on Human Retroviruses and Related Infections in Washington, DC]

Does The Current Level of Laboratory Reliability of CD4+ Absolute Counts Merit the Current Level of Physician Confidence In This Test? K.M. Peddecord, D.P. Francis, A.S. Benenson, L.K. Hofherr, S. Pery, Q. Xie, D.S. Scharf, R.N. Taylor, G.D. Cross, and W.O. Schalla. [Presented January 29-February 2, 1995 at the Second National Conference on Human Retroviruses and Related Infections in Washington, DC]

The CDC Model Performance Evaluation Program for HIV-1 Antibody Testing. T.L. Hearn. [Presented January 30, 1995 at the WHO Consultation Meeting On The Coordination of Quality Assessment Programmes For HIV Testing, Geneva, Switzerland]

Blind Performance Evaluation: Achieving A More Accurate Measure of HIV-Antibody Testing Performance. W.O. Schalla, S.O. Blumer, R.N. Taylor, T.L. Hearn, E.E. Gaunt, S.K. Seilkop, and D.A. Holzworth. [Presented March 6-9, 1995 at the 10th Annual Conference On Human Retrovirus Testing (ASTPHLD) in Reno, Nevada]

Performance of Laboratories Testing HIV-1 Seroconversion Samples in the CDC Model Performance Evaluation Program August 1994 Survey Panels. S.O. Blumer and W.O. Schalla. [Presented March 6-9, 1995 at the 10th Annual Conference On Human Retrovirus Testing (ASTPHLD) in Reno, Nevada]

Variable Hematology Results Due To Specimen Alterations Encountered in Developing A Protocol For A T-Lymphocyte Immunophenotyping Proficiency Testing Program. G.D. Cross, W.O. Schalla, R.N. Taylor, E.E. Gaunt, R.D. Cohn, S.K. Seilkop, and D.A. Holzworth. [Presented March 6-9, 1995 at the 10th Annual Conference On Human Retrovirus Testing (ASTPHLD) in Reno, Nevada]

Trends In Compliance Of Laboratories Performing T-Lymphocyte Immunophenotyping By Flow Cytometry With CD4-Cell Testing Guidelines. R.N. Taylor, G.D. Cross, W.O. Schalla, and J.H. Handsfield. [Presented March 6-9, 1995 at the 10th Annual Conference On Human Retrovirus Testing (ASTPHLD) in Reno, Nevada]

Does The Current Level of Laboratory Reliability of CD4+ Absolute Counts Merit the Current Level of Physician Confidence In This Test? K.M. Peddecord, D.P. Francis, A.S. Benenson, L.K. Hofherr, S. Pery, Q. Xie, D.S. Scharf, R.N. Taylor, G.D. Cross, and W.O. Schalla. [Presented March 6-9, 1995 at the 10th Annual Conference On Human Retrovirus Testing (ASTPHLD) in Reno, Nevada]

Results Of A Telephone Survey Of Local Health Departments On Laboratory Use For The HIV-1-Infected Patient. L.K. Hofherr, D.P. Francis, K.M. Peddecord, A.S. Benenson, J.A. Drew, R.N. Taylor, and W.O. Schalla. [Presented March 6-9, 1995 at the 10th Annual Conference On Human Retrovirus Testing (ASTPHLD) in Reno, Nevada]

Reliability of Absolute CD4 Counts Between Laboratories: Results From A Pilot Study. G.D. Cross, W.O. Schalla, R.N. Taylor, M.T. Siragusa, R.D. Cohn, E.E. Gaunt, and D.A. Holzworth. [Presented at the Clinical Cytometry Tenth Annual Meeting, August 16-19, 1995, Charleston, South Carolina]

Use of Multiple Response Analysis To Characterize Physician=s Use of CD4+ Counts in Clinical Management of HIV+ Patients. S. Perry, K.M. Peddecord, L.K. Hofherr, A.S. Benenson, D.P. Francis, R.N. Taylor, and W.O. Schalla. [Presented October 14-17, 1995 at the Society for Medical Decision Making 17th Annual Meeting, Tempe, Arizona]

Determination of CD4+ Absolute Counts: Some Factors Affecting Hematology Analyzer Results. W.O. Schalla, G.D. Cross, R.N Taylor, M.T. Siragusa, R.D. Cohn, M.J. Borowitz, R.A. Bray, P.E. Hurtubise, A.L. Jackson, J.A. Koepke, A. Landay, J.K.A. Nicholson, W.J. Rickman, G.T. Stelzer. [Presented at the December 12-13, 1995, at the 2nd National Conference on CD4+ T-Lymphocyte Immunophenotyping, Atlanta, Georgia]

Centers for Disease Control and Prevention (CDC) Model Performance Evaluation Program (MPEP): Enzyme Immunoassay and Western Blot Testing Errors. W.O. Schalla. [Presented March 6-8, 1996 at the 11th Annual Conference On Human Retrovirus Testing (ASTPHLD), Orlando, Florida]

Local Health Officer Opinions of Future HIV-Related Demands Upon Local Health Departments. C.E. Rigdon, L.K. Hofherr, D.P. Francis, K.M. Peddecord, A.S. Benenson, R.N. Taylor, W.O. Schalla. [Presented March 6-8, 1996 at the 11th Annual Conference On Human Retrovirus Testing (ASTPHLD), Orlando, Florida]

Performance of Laboratories Using Rapid and/or Simplified Methodology to Test for HIV-1 Antibody in Six CDC Model Performance Evaluation Program Surveys. S.O. Blumer, W.O. Schalla, R.J. Fehd. [Presented March 6-8, 1996 at the 11^th Annual Conference On Human Retrovirus Testing (ASTPHLD), Orlando, Florida]

Characterization of Laboratory Practice in CD4+ T-Cell Testing Laboratories by On-Site Observation. R.N. Taylor, G.D. Cross, W.O.Schalla, M.T. Siragusa. [Presented January 28 - February 1, 1997 at the Third National Conference on Human Retrovirus and Related Infections, Washington, DC]

Intra-Shipment Reproducibility of HIV-1 Western Blot (WB) Results Reported in Ten Shipment Periods by Laboratories Participating in the Centers for Disease Control (CDC) Model Performance Evaluation Program (MPEP). S.O. Blumer, W.O. Schalla, R.J. Fehd. [Presented January 28 - February 1, 1997 at the Third National Conference on Human Retrovirus and Related Infections, Washington, DC]

Results of a Telephone Survey of Local Health Departments on Laboratory Use for the HIV-1 Infected Patient. L.K. Hofherr, D.P. Francis, K.M. Peddecord, A.S. Benenson, C.E. Rigdon, R.N. Taylor, W.O. Schalla. [Presented February 25-28, 1997 at the 12th Annual Conference on Human Retrovirus Testing]

Inter-Shipment Reproducibility of HIV-1 Testing Results Reported by Laboratories Participating in the Centers for Disease Control (CDC) Model Performance Evaluation Program (MPEP). S.O. Blumer, W.O. Schalla, R.J. Fehd. [Presented February 25-28, 1997 at the 12th Annual Conference on Human Retrovirus Testing, Houston, Texas]

Using Quality Control Material is Associated With Reduced Errors In HIV Antibody Testing. J.R. Astles, H.B. Lipman, T.L. Hearn, W.O. Schalla, S.O. Blumer, R.J. Fehd, C. Smith. [Presented February 25-28, 1997 at the 12th Annual Conference on Human Retrovirus Testing, Houston, Texas]

Laboratory Performance in Human T-Lymphotropic Virus Types I/II (HTLV-I/II) Analyses. L.O. Williams, S.O. Blumer, W.O. Schalla, P.H. Robinson, J.H. Handsfield, R.J. Fehd, J.S. Hancock, H.B. Lipman, T.L. Hearn. [Presented May 4-8, 1997 at the 97th Annual Meeting of the American Society for Microbiology; Miami, Florida]

Quality Assurance in HIV Antibody Testing. W.O. Schalla. [Presented at the 3^rd International HIV/AIDS Conference, Seoul, Korea, November 19-21, 1997]

Analysis of Results Reported By Laboratories Participating in the CDC Model Performance Evaluation Program for HIV-1 RNA Determinations. W.O. Schalla. [Presented March 3, 1997 at the Consortium for Retrovirus Serology Standardization Annual Meeting, La Jolla, CA]

Analysis of p24 Antigen Testing Results Reported to the CDC Model Performance Evaluation Program By Laboratories Participating in the June 1997 Survey. S.O. Blumer, W.O. Schalla., T.L. Hearn, and R.J. Fehd. [Presented March 4, 1997 at the 13^th Annual Conference on Human Retrovirus Testing, San Diego, CA]

Analysis of Results Reported By Laboratories Participating in the CDC Model Performance Evaluation Program for HIV-1 RNA Determinations. W.O. Schalla., S.O.Blumer, T.L. Hearn, and R.J. Fehd. [Presented March 4, 1997 at the 13^th Annual Conference on Human Retrovirus Testing, San Diego, CA]

Results of a Survey Examining HIV Viral Report Content. D.P. Francis, K.M. Peddecord, A.S. Benenson, L.K. Hofherr, C. Rigdon, J.R. Astles, and W.O. Schalla. [Presented March 4, 1997 at the 13^th Annual Conference on Human Retrovirus Testing, San Diego, CA]

Results of a Telephone Survey of Laboratory Practices for Viral Load Testing. D.P. Francis, L.K. Hofherr, K.M. Peddecord, A.S. Benenson, C. Rigdon, J.R. Astles, and W.O. Schalla. [Presented March 4, 1997 at the 13^th Annual Conference on Human Retrovirus Testing, San Diego, CA]

Comparison of Absolute CD4 T-Cell Counts, Multi-Platform vs. Single Platform Methods: Results From a Performance Evaluation Program. G.D. Cross, J.H. Handsfield, and W.O. Schalla. [Presented August 19-22, 1998 at the Clinical Applications of Cytometry, 13^th Annual Meeting, Charleston, SC]

Evaluation of Laboratory Performance in Determining HIV-1 RNA Levels Present in CDC Performance Evaluation Samples. S.O. Blumer, W.O. Schalla, T.L. Hearn, and R.J. Fehd. [Presented June 28-July 3, 1998 at the 12^th World AIDS Conference, Geneva, Switzerland]

Comparison of Absolute CD4 and CD* T-Cell Results Measured By Multi-Platform and Single Platform Methods. G.D. Cross, J.H. Handsfield, and W.O. Schalla. [Presented September 16-18, 1998 at the CDC Conference on the Laboratory Science of HIV]

Analysis of p24 Antigen Testing Results Reported to the CDC Model Performance Evaluation Program By Laboratories Participating in the June 1997 and March 1998 Surveys. S.O. Blumer, W.O. Schalla., T.L. Hearn, and R.J. Fehd. [Presented September 16-18, 1998 at the CDC Conference on the Laboratory Science of HIV]

Evaluation of Laboratory Performance in Determining HIV-1 RNA Levels Present in CDC Performance Evaluation Samples. S.O. Blumer, W.O. Schalla, T.L. Hearn, and R.J. Fehd. [Presented September 16-18, 1998 at the CDC Conference on the Laboratory Science of HIV]