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Seasonal Influenza Vaccine Effectiveness, 2011-2012

Table. Description of patients by Age
Age Number % Total
6 months-8 years 1,490 31
9-17 years 666 14
18-49 years 1,549 32
50-64 years 682 14
65+ years 384 8

Table. Description of patients by Gender
Gender Number % Total
Male 2,417 51
Female 2,354 49

Table. Description of patients by Race/ethnicity
Race Number % Total
White, non-Hispanic 3,350 70
Black, non-Hispanic 502 11
Hispanic 425 9
Other, non-Hispanic 494 10

Table. Influenza virus type and subtype among influenza-positive patients
Virus Type Number % Total
Influenza A 550 81
H3N2 440 65
H1N1 pdm09 110 16
Not subtyped – –
Influenza B 131 19
B Yamagata 64 9
B Victoria 64 9
Lineage not determined 3 <1
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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 681 (31) 4090 (49) 47% (36 to 56)
6 mos–8 190 (34) 1300 (56) 45% (20 to 62)
9–17 111 (23) 555 (37) 58% (27 to 76)
18–49 231 (25) 1318 (37) 44% (21 to 60)
50–64 96 (33) 586 (53) 54% (23 to 72)
≥65 53 (60) 331 (77) 43% (-18 to 72)

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 440 (35) 4090 (49) 39% (23 to 52)
6 mos–8 140 (36) 1300 (56) 45% (16 to 64)
9–17 73 (29) 555 (37) 52% (7 to 75)
18–49 130 (29) 1318 (37) 33% (-5 to 57)
50–64 59 (39) 586 (53) 39% (-13 to 67)
≥65 38 (63) 331 (77) 42% (-37 to 76)

Table. Influenza Vaccine Effectiveness by Virus Type and Subtype

Age group (years) Influenza positive (% Vaccinated) Influenza negative % Vaccinated VE 95% CI
Influenza A 550 32 4,090 49 44 (31 to 55)
H3N2 440 35 4,090 49 39 (23 to 52)
H1N1 110 21 4,090 49 65 (44 to 79)
Influenza B 131 27 4,090 49 58 (35 to 73)
B Yamagata 64 28 4,090 49 66 (38 to 81)
B Victoria 64 25 4,090 49 52 (8 to 75)
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