Table 2.
Responses to Influenza A(H1N1) Virus, Influenza A(H3N2) Virus, Influenza B Virus From the B/Victoria-Like Lineage (B/Vic), and Influenza B Virus From the B/Yamagata-Like Lineage (B/Yam) Among Individuals With Responses to B/Vic or B/Yam
| Response,a No. (%) | ||||
|---|---|---|---|---|
| Variable | A(H1N1) | A(H3N2) | B/Vic | B/Yam |
| B/Vic responders (n = 18) | 7 (39) | 14 (78) | 15 (83) | 0 (0) |
| B/Yam responders (n = 23) | 11 (48) | 21 (91) | 0 (0) | 23 (100) |
B/Vic or B/Yam responders were defined on the basis of the presence of HI serum antibodies against viruses of the corresponding lineage and the absence of antibodies against viruses of the opposing lineage. The highest HI titers obtained with representative A(H1N1), A(H3N2), B/Vic, and B/Yam strains from the relevant seasons are shown.
Abbreviation: Hi, hemagglutination inhibition.
a
Defined as individuals with an HI titer of ≥40 to the specified influenza A or B virus.