Seasonal Influenza Vaccine Effectiveness, 2013-2014

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Table. Description of patients by Age
Age Number % Total
6 months-8 years 1,125 20
9-17 years 625 11
18-49 years 2,168 39
50-64 years 1,096 20
65+ years 623 11
Table. Description of patients by Gender
Gender Number % Total
Male 2,367 40
Female 3,632 60
Table. Description of patients by Race/ethnicity
Race Number % Total
White, non-Hispanic 4,330 78
Black, non-Hispanic 407 7
Hispanic 434 8
Other, non-Hispanic 398 7
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Table. Influenza virus type and subtype among influenza-positive patients
Virus Type Number % Total
Influenza A 1,127 94
H3N2 105 9
H1N1 1022 85
Not subtyped – –
Influenza B 70 6
B Yamagata 54 5
B Victoria 15 1
Lineage not determined 1 <1

Coinfections present include: 5 cases coinfected with Influenza A (H3N2) and Influenza B Yamagata; 1 case coinfected with Influenza A (H3N2) and Influenza B Yamagata (lineage not determined); 1 case coinfected with Influenza A (not subtyped) and Influenza B Yamagata; 3 cases coinfected with Influenza B Yamagata and Influenza B/Victoria

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Table. Influenza vaccine effectiveness for all vaccine types, against influenza A or B viruses
Age group (years) Influenza positive Total Influenza positive (% Vaccinated) Influenza negative Total Influenza negative (% Vaccinated) Adjusted VE % Adjusted 95% CI
All ages 1,197 (33) 4,440 (55) 52% (44 to 59)
6 mos–8 171 (32) 954 (54) 45% (20 to 63)
9–17 110 (26) 515 (43) 53% (23 to 72)
18–49 545 (24) 1,623 (44) 54% (41 to 64)
50–64 269 (40) 827 (66) 59% (43 to 70)
≥65 102 (70) 521 (83) 50% (16 to 71)
Table. Influenza vaccine effectiveness for all vaccine types, against influenza A (H1N1) viruses
Age group (years) Influenza positive Total Influenza positive (% Vaccinated) Influenza negative Total Influenza negative (% Vaccinated) Adjusted VE % Adjusted 95% CI
All ages 1,022 (31) 4,440 (55) 54% (46 to 61)
6 mos–8 151 (30) 954 (54) 48% (22 to 66)
9–17 79 (23) 515 (43) 54% (16 to 75)
18–49 476 (24) 1,623 (44) 53% (39 to 64)
50–64 235 (37) 827 (66) 64% (48 to 74)
≥65 81 (67) 521 (83) 59% (25 to 77)
Table. Influenza vaccine effectiveness for Live Attenuated Influenza Vaccines in children, against influenza A or B viruses
Age group (years) Influenza positive Total Influenza positive (% Vaccinated) Influenza negative Total Influenza negative (% Vaccinated) Adjusted VE % Adjusted 95% CI
2-17 212 (16) 773 (17) 7% (-46 to 40)
2-8 120 (18) 418 (17) -36% (-151 to 27)
9-17 92 (13) 355 (17) 41% (-21 to 72)
Table. Influenza vaccine effectiveness for Inactivated Influenza Vaccine in children, against influenza A or B viruses
Age group (years) Influenza positive Total Influenza positive (% Vaccinated) Influenza negative Total Influenza negative (% Vaccinated) Adjusted VE % Adjusted 95% CI
2-17 222 (16) 1,113 (39) 60% (41 to 73)
2-8 124 (17) 663 (43) 59% (30 to 76)
9-17 98 (15) 450 (33) 6% (27 to 79)
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Page last reviewed: October 3, 2019
Content source: Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (NCIRD)