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Seasonal Influenza Vaccine Effectiveness, 2013-2014

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

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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