Serum antibody responses in rhesus macaques infected with the indicated APMV.^*

*This is continuation of the experiment described in Tables? 2 and 3. Serum samples were collected before inoculation on day 0, and after inoculation on days 21 and 28. †The hemagglutination inhibition (HI) titer is expressed as the mean reciprocal log2 (± standard errors of the mean) of the highest serum dilution causing complete inhibition of four HA units of the indicated APMV, except for APMV-5, which was evaluated by neuraminidase inhibition (NI) assay. All the values are averages from three independent experiments. The mean serum HI titers in all the day 0 serum samples were 0. ‡The serum neutralizing antibody titers were expressed as mean reciprocal log2 of the serum dilution resulting in complete neutralization of infection in 50% of the wells (mean ± standard errors of the mean). The limit of detection is 0. The mean neutralizing antibody titers in all the day 0 serum samples were 0. §The antibody response to APMV-5 was evaluated by NI assay as described in Materials and Methods. The NI titer is expressed as the mean reciprocal log2 (± standard errors of the mean) of the highest serum dilution causing neuraminidase inhibition.