Seasonal Influenza Vaccine Effectiveness, 2016-2017

Table. Description of patients by Race/ethnicity
Race Number % Total
White, non-Hispanic 5,337 76
Black, non-Hispanic 550 8
Hispanic 607 9
Other, non-Hispanic 571 8
Table. Influenza virus type and subtype among influenza-positive patients
Virus Type Number % Total
Influenza A 1,399 68
H3N2 1,342 66
H1N1 26 1
Not subtyped 31 1
Influenza B 648 32
B Yamagata 577 28
B Victoria 63 3
Lineage not determined 8 <1

2Coinfections are present in this dataset: 5 co-infections with more than one influenza virus type/subtype

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 2403 (42) 5040 (52) 40% (32 to 46)
6 mos–8 338 (28) 1181 (49) 57% (43 to 68)
9–17 403 (30) 608 (40) 36% (15 to 52)
18–49 528 (38) 1637 (43) 19% (0 to 34)
50–64 447 (46) 915 (58) 40% (24 to 53)
≥65 327 (76) 699 (80) 20% (-11 to 43)
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 1342 (45) 5040 (52) 33% (23 to 41)
6 mos–8 190 (32) 1181 (49) 49% (28 to 64)
9–17 259 (29) 608 (40) 33% (7 to 52)
18–49 351 (39) 1,637 (43) 13% (-11 to 32)
50–64 304 (49) 915 (58) 31% (9 to 47)
≥65 238 (77) 699 (80) 21% (-15 to 45)
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 577 (37) 5040 (52) 52% (42 to 61)
6 mos–8 113 (20) 1181 (49) 73% (54 to 84)
9–17 122 (32) 608 (40) 37% (1 to 60)
18–49 137 (34) 1637 (43) 30% (-3 to 53)
50–64 129 (41) 915 (58) 63% (42 to 76)
≥65 76 (70) 699 (80) 34% (-24 to 65)
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 577 (37) 5040 (52) 52% (42 to 61)
6 mos–8 113 (20) 1181 (49) 73% (54 to 84)
9–17 122 (32) 608 (40) 37% (1 to 60)
18–49 137 (34) 1637 (43) 30% (-3 to 53)
50–64 129 (41) 915 (58) 63% (42 to 76)
≥65 76 (70) 699 (80) 34% (-24 to 65)