US Flu VE Data for 2018-2019

Interim Estimates - MMWR

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Reference: Flannery, et al, 2019

Description of patients enrolled in the US Flu VE Network, 2018-2019
Age
Age Number % Total
6 months-8 years 2428 24
9-17 years 1261 13
18-49 years 3256 33
50-64 years 1766 18
65+ years 1301 13
Gender
Gender Number % Total
Male 4018 40
Female 5994 60
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Race/ethnicity
Race Number % Total
White, non-Hispanic 6845 69
Black, non-Hispanic 1142 11
Hispanic 947 10
Other, non-Hispanic 1023 10
Influenza virus type and subtype among influenza-positive patients, US Flu VE Network, 2018-2019
Virus Type Number % Total
Influenza A 2699 98
H3N2 1350 48
H1N1pdm09 1325 48
Not subtyped 32 1
Influenza B 64 2
B Yamagata 22 1
B Victoria 41 1
Lineage not determined 1 <1

** Flannery, et al, 2019

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Influenza vaccine effectiveness for all vaccine types, Against influenza A or B viruses

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 2763 (48) 7249 (56) 29 (21, 35)
6 mos–8 years 751 (40) 1677 (58) 48 (37, 58)
9–17 489 (44) 772 (41) 7 (-20, 28)
18–49 821 (39) 2435 (44) 25 (10, 37)
50–64 442 (60) 1324 (63) 14 (-10, 33)
≥65 260 (82) 1041 (83) 12 (-31, 40)
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 1325 (42) 7249 (56) 44 (37, 51)
6 mos–8 years 389 (33) 1677 (58) 59 (47, 69)
9–17 115 (41) 772 (41) 24 (-18, 51)
18–49 442 (34) 2435 (44) 43 (28, 55)
50–64 255 (54) 1324 (63) 30 (6, 48)
≥65 124 (81) 1041 (83) 16 (-41, 51)

 

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 1350 (53) 7249 (56) 9 (-4, 20)
6 mos–8 years 335 (49) 1677 (58) 24 (1, 42)
9–17 355 (46) 772 (41) 3 (-30, 28)
18–49 351 (44) 2435 (44) 3 (-25, 24)
50–64 176 (69) 1324 (63) -20 (-74, 18)
≥65 133 (82) 1041 (83) 13 (-46, 48)

 

Influenza vaccine effectiveness for all vaccine types, Influenza B viruses
Age group (years) Influenza positive
Total		 Influenza positive
(% Vaccinated)		 Influenza negative
Total		 Influenza negative
(% Vaccinated)		 Adjusted VE % Adjusted 95% CI
All ages 64 (48) 7249 (56) 34 (-12, 62)

 

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