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Seasonal Influenza Vaccine Effectiveness, 2017-2018

Table. Description of patients by Age
Age Number % Total
6 months-8 years 504 24
9-17 years 399 19
18-49 years 732 34
50-64 years 291 14
65+ years 186 9

3Missing 16 subjects data

Table. Description of patients by Gender
Gender Number % Total
Male 820 39
Female 1,308 61

Table. Description of patients by Race/ethnicity
Race Number % Total
White, non-Hispanic 1,215 57
Black, non-Hispanic 208 10
Hispanic 554 26
Other, non-Hispanic 151 7

Table. Influenza virus type and subtype among influenza-positive patients
Virus Type Number % Total
Influenza A 2,152 69
H3N2 1,790 58
H1N1 326 10
Not subtyped 36 <1
Influenza B 970 31
B Yamagata 917 30
B Victoria 39 <1
Lineage not determined 14 <1

3Flannery et. Al, 2018

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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 3097 (42) 5538 (54) 40% (34 to 46)
6 mos–8 616 (33) 1380 (55) 53% (42 to 62)
9–17 529 (31) 584 (38) 29% (8 to 46)
18–49 966 (33) 1893 (43) 35% (23 to 46)
50–64 571 (53) 938 (62) 33% (17 to 47)
≥65 415 (75) 743 (80) 20% (-9 to 41)

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 1790 (45) 5538 (54) 24% (15 to 33)
6 mos–8 337 (39) 1380 (55) 37% (17 to 52)
9–17 335 (35) 584 (38) 10% (-23 to 35)
18–49 581 (38) 1,893 (43) 14% (-6 to 30)
50–64 298 (56) 938 (62) 25% (0 to 44)
≥65 239 (75) 743 (80) 17% (-22 to 44)

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 917 (41) 5538 (54) 49% (40 to 46)
6 mos–8 130 (34) 1380 (55) 46% (19 to 64)
9–17 161 (28) 584 (38) 39% (9 to 59)
18-49 268 (25) 1893 (43) 57% (42 to 68)
50-64 216 (50) 938 (62) 45% (24 to 60)
≥165 142 (75) 743 (80) 29% (-12 to 55)
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