Serum antibody responses against APMV serotypes 1–9 in infected micea.

All the values are averages from three independent experiments.aMice in groups of 3 were inoculated as in Table 1. Serum samples were collected before inoculation and 14 dpi.bThe hemagglutination inhibition (HI) titer is expressed as the reciprocal of the highest serum dilution causing complete inhibition of four HA units of NDV.- = not detected.