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Seasonal Influenza Vaccine Effectiveness, 2012-2013

Table. Description of patients by Age
Age Number % Total
6 months-8 years 1,509 23
9-17 years 981 15
18-49 years 2,267 35
50-64 years 1,040 16
65+ years 655 10

Table. Description of patients by Gender
Gender Number % Total
Male 2,654 41
Female 3,798 59

Table. Description of patients by Race/ethnicity
Race Number % Total
White, non-Hispanic 4,866 76
Black, non-Hispanic 512 8
Hispanic 541 8
Other, non-Hispanic 520 8

Table. Influenza virus type and subtype among influenza-positive patients
Virus Type Number % Total
Influenza A 1,381 60
H3N2 1,292 56
H1N1 52 2
Not subtyped 36 2
Influenza B 933 40
B Yamagata 582 25
B Victoria 303 13
Lineage not determined 50 2

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 2307 (34) 4145 (50) 49% (43 to 55)
6 mos–8 555 (31) 954 (53) 57% (45 to 67)
9–17 420 (27) 561 (38) 39% (18 to 54)
18–49 739 (30) 1528 (41) 39% (26 to 50)
50–64 370 (38) 670 (62) 65% (54 to 74)
≥65 223 (69) 432 (75) 26% (-10 to 50)

Table. Influenza vaccine effectiveness for all vaccine types, 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 1292 (40) 4,145 (50) 39% (29 to 47)
6 mos–8 242 (35) 954 (53) 51% (32 to 64)
9–17 178 (31) 561 (38) 24% (-12 to 49)
18–49 478 (31) 1,528 (41) 34% (16 to 48)
50–64 228 (46) 670 (62) 52% (33 to 65)
≥65 166 (74) 432 (75) 11% (-41 to 43)

Table. Influenza vaccine effectiveness for all vaccine types, 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 582 (24) 4145 (50) 66% (58 to 73)
6 mos–17 323 (21) 1515 (47) 68% (57 to 76)
≥18 259 (27) 2630 (52) 65% (53 to 75)

Table. Influenza vaccine effectiveness for all vaccine types, Influenza B/Victoria lineage viruses

Age group (years) Influenza positive Total Influenza positive (% Vaccinated) Influenza negative Total Influenza negative (% Vaccinated) Adjusted VE % Adjusted 95% CI
All ages 303 (32) 4145 (50) 51% (36 to 63)
6 mos–17 190 (33) 1515 (47) NR NR
≥18 113 (31) 2630 (52) 58% (35 to 73)
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