Figure 8
From: Impaired immune responses in the lungs of aged mice following influenza infection
Anti-Influenza Neutralizing Antibodies. Anti-influenza neutralizing antibodies titers were assayed in sera samples by HAI assay. Aged animals (black circles) developed antibodies at neutralizing titer (1:40 -- dotted line) quicker than aged mice (white squares). The arithmetic mean (± SEM) of the sera HAI titer at each time point was plotted. Six mice per time point were assayed, except at days 7 and 15, where 10 mice were assayed. Stars indicate statistical difference between aged and naïve animals. *P < 0.05. **P < 0.01. ***P < 0.001.