Five cases of dual isolations of different serotypes of avian paramyxo
viruses (APMV) from domestic and wild birds are described: one case of
mixed infection by APMV-1 and AFMV-4 and four cases of infection by A
PMV-1 and APMV-2 serotypes. The double infection was proven by consecu
tive isolations of two viruses from allantoic fluid samples derived fr
om single swabs after their respective treatment by antisera against e
ach suspected virus. The finding of double APMV infection in poultry f
arms appears to be important for epizootiology and pathogenesis of APM
V-caused diseases. (C) 1997 Elsevier Science B.V.