From: Asymptomatic ratio for seasonal H1N1 influenza infection among schoolchildren in Taiwan
Vaccine strain
Seroconversion number (%)
A/New Caledonia/20/99 (H1N1)
80 (31.37)
A/California/7/2004 (H3N2)
31 (12.17)
B/Shanghai/361/2002 (B)
4 (1.57)