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1 Department of Microbiology
and2 Department of Physiology, University of Birmingham, Birmingham B15 2TT
and3 Institute of Child Health, Francis Road, Birmingham B16 8ET, U.K.
Mice that did not contain antibodies to rotavirus were orally infected with murine rotavirus (EDIM strain) and observed over 7 days. As judged by ELISA, only the small intestine was infected, not the colon. The infection was biphasic, viral antigen peaks being observed at 48 h and approximately 120 h post-infection. Clinically evident diarrhoea was maximal at 72 h. Virus in the upper, middle and lower regions of the small intestine was mainly tissue-associated; most virus was found in the middle small intestine. Two peaks (48 h and 120 h post-infection) of virus antigen were observed in the colon, but these corresponded to luminal, not tissue-associated viral antigen. Only enterocytes in the upper two-thirds of villus epithelia were infected as judged by fluorescent-antibody analysis and transmission electron microscopy. Scanning electron microscopy revealed morphological appearances not hitherto correlated with the progress of the infection: villus tips were convoluted, corresponding to the shedding of virus-infected cells but the lower regions of infected villi were shrunken and considerably narrowed compared to tips.
Keywords: murine rotavirus, diarrhoeal disease, intestinal infection
Received 25 April 1986;
accepted 7 August 1986.
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