Virus isolation from the indicated tissue harvested from mice 3 dpi with APMV serotypes 1 to 9*.

*Mice in groups of 3 were inoculated with 50 ìl of allantoic fluid containing 27 HA units of each APMV serotype except serotype 5, which contained 3×103 PFU/ml of cell culture harvested virus. The control group was inoculated with normal allantoic fluid. Tissues were harvested 3 dpi and homogenized, and clarified supernatant fluid was inoculated into 9-day-old embryonated eggs and tested for virus 4 days later by HA assay.+ = each + indicates isolation of virus from one mice.- = no virus was isolated.ND = not detected.