US Flu VE Data for 2019-2020

Description of patients enrolled in the US Flu VE Network, 2019-2020
Age
Age Number % Total
6 months-8 years 2006 23
9-17 years 1193 13
18-49 years 3260 37
50-64 years 1350 15
65+ years 1035 12
Sex
Sex Number % Total
Male 3678 42
Female 5165 58
Unknown 1 <1
Race/ethnicity
Race Number % Total
White, non-Hispanic 6293 71
Black, non-Hispanic 800 9
Hispanic 835 9
Other, non-Hispanic 895 10
Unknown 21 <1

Preliminary end of season influenza vaccine effectiveness for all vaccine types

Preliminary end of season 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 2723 1158 (43) 6121 3414 (56) 39 (32, 45)
6 mos–8 645 271 (42) 1361 763 (56) 33 (17, 45)
9–17 471 158 (34) 722 327 (45) 37 (17, 51)
18–49 1057 395 (37) 2203 1001 (45) 35 (24, 45)
50–64 351 184 (52) 999 624 (62) 42 (24, 56)
≥65 199 150 (75) 836 699 (84) 37 (5, 58)
Preliminary end of season influenza vaccine effectiveness for all vaccine types, Influenza A(H1N1)pdm09 viruses
Age group (years) Influenza positive
Total
Influenza positive
(% Vaccinated)
Influenza negative
Total
Influenza negative
(% Vaccinated)
Adjusted VE % Adjusted 95% CI
All ages 1405 686 (49) 6121 3414 (56) 31 (22, 40)
6 mos–8 276 132 (48) 1361 763 (56) 22 (-4, 42)
9–17 132 53 (40) 722 327 (45) 29 (-8, 53)
18–49 577 246 (43) 2203 1001 (45) 28 (10, 41)
50–64 273 144 (53) 999 624 (62) 45 (25, 60)
≥65 147 111 (76) 836 699 (84) 38 (0, 62)

 

Preliminary end of season influenza vaccine effectiveness for all vaccine types, against influenza B/Victoria viruses
Age group (years) Influenza positive
Total
Influenza positive
(% Vaccinated)
Influenza negative
Total
Influenza negative
(% Vaccinated)
Adjusted VE % Adjusted 95% CI
All ages 1210 427 (35) 6121 3414 (56) 44 (35, 51)
6 mos–8 348 132 (38) 1361 763 (56) 38 (18, 53)
9–17 329 103 (31) 722 327 (45) 39 (17, 55)
18–49 434 132 (30) 2203 1001 (45) 44 (29, 58)
50–64 57 29 (51) 999 624 (62) 39 (-8, 65)
≥65 42 31 (74) 836 699 (84) 42 (-24, 73)

 

Influenza virus type and subtype among influenza-positive patients, US Flu VE Network, 2019-2020
Virus Type Number % Total
Influenza A 1,504 55
H3N2 29 1
H1N1pdm09 1,405 51
A, Not subtyped 70 3
Influenza B 1,229 45
B Yamagata 6 <1
B Victoria 1,210 44
Lineage not determined 13 <1

** Flannery, et al, 2019