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J Virol. 1990 January; 64(1): 361-368

Extramucosal spread and development of hepatitis in immunodeficient and normal mice infected with rhesus rotavirus.

Department of Pediatrics, School of Medicine, State University of New York, Buffalo.

ABSTRACT

The pathogenic profiles of two heterologous animal rotaviruses, rhesus rotavirus strain MMU 18006 and bovine rotavirus strain WC3, were evaluated in mice with severe combined immunodeficiency (SCID mice) and normal BALB/c mice. Control animals were inoculated with homologous murine strain EDIM 5099 or a tissue culture-adapted murine rotavirus. Heterologous infection with rhesus rotavirus resulted in hepatitis in 84% of SCID and 21% of BALB/c mice, with mortality rates of 27 and 0%, respectively. Surviving SCID animals developed chronic liver disease, while symptoms in BALB/c mice resolved in 2 to 4 weeks after onset. Histopathologic examination revealed a diffuse hepatitis with focal areas of parenchymal necrosis. Rotavirus was detected in liver tissue from 100% of 29 SCID and 85% (11 of 13) BALB/c animals tested by cell culture infectivity, immunofluorescence, or electron microscopy. No extramucosal spread of virus or hepatitis was observed after infection with heterologous bovine strain WC3 or homologous murine rotaviruses. This finding of a novel rotavirus-induced disease manifestation suggests altered tissue tropism in a heterologous host for a group of viruses previously shown to replicate exclusively in the gut mucosa. The implications of our observations suggest that in human vaccine trials utilizing heterologous rotavirus strains, special attention should be paid to children with immunodeficiency disorders, and screening for hepatic function should be included in vaccine protocols.

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