Growth kinetics of APMV-3 strain Netherlands and Wisconsin in the brains of 1-day-old chicks in comparison with neurotropic APMV-1 strain Beaudette C (BC) and lentogenic strain LaSota. Fifteen 1-day-old chicks were inoculated with 0.05 mL of 1:10 dilution of 2⁸ HA units of APMV-1 strain BC or APMV-1 strain LaSota or APMV-3 strain Netherlands or Wisconsin via the intracerebral route. Brain tissue was collected by sacrificing three birds from each group on 1, 2, 3, 4 and 5 days post inoculation, except that in the case of NDV BC all remaining birds died of infection on day 3 and were assayed at that time point. Each time point represents the geometric mean of the individual virus titers of three birds.