Seasonal Influenza Vaccine Effectiveness, 2014-2015

Español
Related Pages
Table. Description of patients by Age
Age Number % Total
6 months-8 years 2,419 26
9-17 years 1,342 14
18-49 years 2,848 31
50-64 years 1,496 16
65+ years 1,206 13
Table. Description of patients by Gender
Gender Number % Total
Male 3,923 42
Female 5,288 58
Table. Description of patients by Race/ethnicity
Race Number % Total
White, non-Hispanic 6,888 74
Black, non-Hispanic 688 7
Hispanic 840 9
Other, non-Hispanic 872 9
On This Page

Table. Influenza virus type and subtype among influenza-positive patients
Virus Type Number % Total
Influenza A 1,840 82
H3N2 1,817 81
H1N1 4 <1
Not subtyped 19 <1
Influenza B 395 18
B Yamagata 340 15
B Victoria 47 2
Lineage not determined 8 <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

Top of Page
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 2,233 (49) 7,078 (55) 19% (10 to 27)
6 mos–8 473 (39) 1,946 (52) 25% (6 to 40)
9–17 392 (35) 950 (41) 25% (2 to 42)
18–49 642 (42) 2,206 (45) 7% (-12 to 33)
50–64 378 (61) 1,118 (66) 20% (-3 to 38)
≥65 348 (79) 858 (85) 32% (3 to 52)
Table. Influenza vaccine effectiveness for all vaccine types, against Influenza A (H3N2) viruses
Age group (years) Influenza positive Total Influenza positive (% Vaccinated) Influenza negative Total Influenza negative (% Vaccinated) Adjusted VE % Adjusted 95% CI
All ages 1,817 (52) 7,078 (55) 6% (-5 to 17)
6 mos–8 396 (40) 1,946 (52) 20% (-3 to 37)
9–17 306 (39) 950 (41) 7% (-26 to 31)
18–49 531 (44) 2,206 (45) -6% (-31 to 24)
50–64 281 (63) 1,118 (66) 12% (-19 to 34)
≥65 303 (82) 858 (85) 12% (-29 to 40)
Table. Influenza vaccine effectiveness for all vaccine types, against Influenza B/Yamagata lineage viruses
Age group (years) Influenza positive Total Influenza positive (% Vaccinated) Influenza negative Total Influenza negative (% Vaccinated) Adjusted VE % Adjusted 95% CI
All ages 340 (38) 7,078 (55) 55% (43 to 65)
6 mos–8 60 (30) 1,946 (52) 54% (17 to 74)
9–17 60 (15) 950 (41) 77% (51 to 89)
18–49 90 (29) 2,206 (45) 55% (27 to 73)
50–64 90 (58) 1,118 (66) 24% (-20 to 52)
≥65 40 (58) 858 (85) 74% (45 to 87)
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
A H3N2
2-17 490 (20) 1,682 (22) -5% (-40 to 21)
B Yamagata
2-17 98 (6) 1,682 (22) 76% (43 to 90)
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
A H3N2
2-17 554 (29) 2,067 (36) 13% (-10 to 30)
B Yamagata
2-17 108 (16) 2,067 (32) 66% (41 to 80)
Top of Page
Page last reviewed: October 3, 2019
Content source: Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (NCIRD)