[The virus of Carre's disease in cattle and the rabbit: serological study and relation to immunity to bovine plague].
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Mucosal scrapings from the large intestine of two goats that had died from peste des petits ruminants (PPR) in separate outbreaks in Nigeria were examined for viruses. A mixed viral infection of PPR virus (morbillivirus) and adenovirus was confirmed in both goats. The adenoviruses did not conform to any of the ovine and bovine serotypes recognised; the two isolates were considered different serotypes. It is concluded that, although the role of adenoviruses in the epizootiology of PPR in Nigeria is difficult to appraise, they are probably commensals. This is believed to be the first report of the isolation of adenoviruses from goats.
2 Egyptian goats and Boscat rabbits were experimentally inoculated with peste des petits ruminants (PPR) local Egyptian strain (PPR, Egypt 87). The inoculated animals contracted the disease with minor clinical manifestations, accompanied by rise of neutralizing antibodies to PPR virus. Virus was isolated from ocular and nasal secretions, buffy coat, spleen, and liver. No contact infection was observed between inoculated and healthy goats.
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In order to study the pathomorphology and immunohistochemistry of peste des petits ruminants, four goats and two sheep were inoculated intranasally with the Malig-Yemen strain of peste des petits ruminants virus. The animals developed fever, nasal discharge, oral erosions, cough and diarrhea. One goat and one sheep died and one moribund goat was killed. Three animals survived the infection. At necropsy, erosive stomatitis, pneumonia and gastroenteritis were found. Histopathologically the pneumonocytes and epithelial cells of the ileum had eosinophilic cytoplasmic and nuclear inclusions. By an indirect immunoperoxidase method, the nuclei and cytoplasm of the ileal epithelial cells of one goat contained positively (brown) stained antigen, which corresponded to viral nucleocapsids by electron microscopy. Virus appeared to be released through the microvilli of the epithelial cells. We also confirmed the formation of giant cells due to peste des petits ruminants virus.
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The Rabbit bovipest virus selectively destroys the lymphoid B line in the Rabbit. Estrogens inhibit this destruction when they are administered before the infection which leads are to think that they act on membrane sites of the lymphocytes.
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