Pathogenicity and Distribution of Egg-Drop Syndrome-1976 Virus (JPA-1) in Inoculated Laying Hens

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Abstract
Rhode Island Red laying hens that lacked hemagglutination-inhibition antibody were inoculated orally with the JPA-1 strain of adenovirus isolated from a flock affected with egg-drop syndrome-1976 in Japan and observed for 80 days. Of 16 inoculated hens, 15 laid abnormal eggs (shell-less, soft-shelled, cracked and those with loss of pigmentation) from 8 days postinoculation (PI). Egg-production rate fell from 94 to 50%, 13-16 days PI. When the abnormal eggs were excluded, egg production was 17%; it recovered slowly, reaching 67% by the end of the experiment. The virus was recovered from various organs of inoculated hens 3-7 days PI. Fluorescent virus antigens were observed in the epithelial and desquamated cells from the uterus and isthmus 10 and 14 days PI.

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