Early Adaptive Humoral Immune Responses and Virus Clearance in Humans Recently Infected with Pandemic 2009 H1N1 Influenza Virus
Figure 5
Time course of HI titers against homologous and heterologous virus strains in week of H1N1 infection.
a) HI titers against 2009 H1N1 grouped by days since of illness; b) Longitudinal kinetic of HI titers against 2009 H1N1 in 73 subjects. Paired two samples from each subject, including one was collected within 3 days after the illness onset and the other was collected during day 4–10, were determined for their HI titers in parallel and compared; c) HI titers against H3 in 25 paired subjects infected with 2009 H1N1.