Abstract
Rotavirus particles were demonstrated by electron microscopy in the feces of lambs with diarrhea. Rotavirus antigen was synthesized in cell cultures infected with filtrates of the diarrheic feces, but the virus was not adapted to grow serially in cell cultures. An antigenic relationship between rotaviruses from lambs, pigs, and calves was demonstrated by immunofluorescence. Colostrum-deprived lambs were infected with the lamb rotavirus, and the virus was passaged in lambs. Viral replication occurred in the villous epithelial cells of the small intestine, and the virus was excreted in the feces up to 78 h postinfection. Diarrhea was not observed in the experimentally infected lambs.
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