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US Flu VE Data for 2018-2019

Interim Estimates - MMWR

Reference: Doyle (2019)

Description of patients enrolled in the US Flu VE Network, 2018-2019

Age

Age Number % Total
6 months-8 years 807 25
9-17 years 292 9
18-49 years 1098 34
50-64 years 595 18
65+ years 462 14

Gender

Gender Number % Total
Male 1336 41
Female 1917 59

Race/ethnicity

Race Number % Total
White, non-Hispanic 2191 68
Black, non-Hispanic 381 11
Hispanic 328 10
Other, non-Hispanic 343 11

Influenza virus type and subtype among influenza-positive patients, US Flu VE Network, 2018-2019

Virus Type Number % Total
Influenza A 394 97
H3N2 101 25
H1N1pdm09 293 73
Not subtyped 62 15
Influenza B 9 2
B Yamagata
B Victoria
Lineage not determined
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Influenza vaccine effectiveness for all vaccine types, 2018-19

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 486 (43) 2789 (57) 47% (34 to 57)
6 mos–17 173 (34) 926 (56) 61% (44 to 73)
18–49 166 (35) 932 (43) 37% (9 to 56)
≥ 50 126 (65) 931 (72) 24% (-15 to 51)

Influenza A(H1N1) viruses

Age group (years) Influenza positive
Total
Influenza positive
(% Vaccinated)
Influenza negative
Total
Influenza negative
(% Vaccinated)
Adjusted VE % Adjusted 95% CI
All ages 293 (43) 2789 (57) 44% (13 to 64)
6 mos–17 106 (35) 926 (56) 62% (40 to 75)
18–49 113 (34) 932 (43) 45% (14 to 64)
≥ 50 74 (68) 931 (72) 8% (-59 to 46)

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 101 (42) 2789 (57) 44% (13 to 64)
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