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Journal of Virology, January 2005, p. 944-954, Vol. 79, No. 2
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.2.944-954.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Development of a Rotavirus-Shedding Model in Rhesus Macaques, Using a Homologous Wild-Type Rotavirus of a New P Genotype

Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio,¹ Tulane National Primate Research Center, Covington, Louisiana²

Received 22 June 2004/ Accepted 1 September 2004

Although there are several reports on rotavirus inoculation of nonhuman primates, no reliable model exists. Therefore, this study was designed to develop a rhesus macaque model for rotavirus studies. The goals were to obtain a wild-type macaque rotavirus and evaluate it as a challenge virus for model studies. Once rotavirus was shown to be endemic within the macaque colony at the Tulane National Primate Research Center, stool specimens were collected from juvenile animals (2.6 to 5.9 months of age) without evidence of previous rotavirus infection and examined for rotavirus antigen. Six of 10 animals shed rotavirus during the 10-week collection period, and the electropherotypes of all isolates were identical to each other but distinct from those of prototype simian rotaviruses. These viruses were characterized as serotype G3 and subgroup 1, properties typical of many animal rotaviruses, including simian strains. Nucleotide sequence analysis of the VP4 gene was performed with a culture-grown isolate from the stool of one animal, designated the TUCH strain. Based on both genotypic and phylogenetic comparisons between TUCH VP4 and cognate proteins of representatives of the reported 22 P genotypes, the TUCH virus belongs to a new genotype, P[23]. A pool of wild-type TUCH was prepared and intragastrically administered to eight cesarean section-derived, specific-pathogen-free macaques 14 to 42 days of age. All animals were kept in a biocontainment level 2 facility. Although no diarrhea was observed and the animals remained clinically normal, all animals shed large quantities of rotavirus antigen in their feces after inoculation, which resolved by the end of the 14-day observation period. Therefore, TUCH infection of macaques provides a useful nonhuman primate model for studies on rotavirus protection.

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