Outbreaks of swollen head syndrome (SHS) were observed in two broiler
and two broiler-breeder farms in Taiwan. The disease was characterized
by oedematous swelling of the head, especially surrounding the eyelid
s, the neck and wattles. Avian pneumovirus and Escherichia coli were i
solated from birds in all four farms. In addition, Staphylococcus aure
us and infectious bursal disease virus were each isolated from one far
m. A serological survey of 398 birds from 11 broiler breeder farms sho
wed 86.4% (344) of them had ELISA antibodies against turkey rhinotrach
eitis virus.