A condition similar to egg-drop svndrome-1976 (EDS-76) occurred in S layer and broiler breeding flocks in 4 counties in Taiwan from Aptilto Oct. 1982, and it was diagnosed as EDS-76 by virological investigations. Egg production fell suddenly when the hen were 24-41 weeks of age, and the depression lasted 4-12 weeks. Production reduced 6 to 25%. Depressed egg production was accompanied by the laying of shell-less, soft-shelled, and thin-shelled
Sumrna- eggs associated with loss of egg-shell pigment. @Seven isolates of hemagglutinating adenovinis were isolated from cloacal swabs and faeces of infected hens. One isolate, cloned and named TN stan. had the same antigeriicitv in serologic test and same biological and physico chemical properties as the JPA-l strain of EDS-76 virus.
This is th efirst report on the outbreaks of EDS-76 in Taiwan and the isolation of the etiological virus.