Pathology of egg drop syndrome in layer chickens
2007
Ogawa, A.(Chiba-ken. Government Office (Japan)) | Aoki, F. | Matsumoto, A. | Murakami, S. | Ashizawa, T. | Kinoshita, T. | Kubo, M.
Thin-shelled eggs, loss of egg-shell pigment and decreases in egg production were reported from 2 layer chicken farms in Chiba prefecture, Japan from April to May 2005. Uterine edema and shell-1ess eggs in oviduct were observed at necropsy. In uterus, intense edema of lamina propria mucosa and submucosa, atrophy or absent of tubular glands, severe polyvasculitis, infiltration of mononuclear cells in entire mucosa and intranuclear inclusion bodies in superficial epithelial cells were observed histopathologically. Virus particles of about 70nm in diameter were detected in these intranuclear inclusion bodies by electron microscopy. From these results, this case was diagnosed as egg drop syndrome (EDS). For diagnosis of EDS, chickens should be examined pathologically within 7 to 14 days after appearance of symptoms such as egg drop, soft-shell or shell-1ess eggs, and loss of egg-sell pigment.
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