“…In 1974, an acute fatal disease affecting caged budgerigars was reported in Kunitachi, Tokyo, Japan, and an avian paramyxovirus (APMV) classified in the fifth serogroup of APMV, namely, strain APMV-5/budgerigar/Japan/Kunitachi/74 (Kunitachi), was isolated from a dead budgerigar ( 1 ). In 1975, similar diseases affecting budgerigars were reported throughout Japan, and a paramyxovirus, strain APMV-5/budgerigar/Japan/TI/75 (TI), was isolated from a dead budgerigar ( 2 ). To date, there are only four reports in the world on APMV-5 infections ( 3 , 4 ).…”