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Hamster Polyomavirus Infection in a Pet Syrian Hamster (Mesocricetus auratus)

Abstract

An approximately 8-week-old pet Syrian hamster (Mesocricetus auratus) with a 1-week history of dyspnea, hyporexia, and ataxia was submitted for necropsy. On gross examination, the hamster had multiple abdominal adhesions and enlargement of the mesenteric lymph node. Histologic evaluation revealed multicentric lymphoma of the liver, jejunum, mesenteric lymph node, testicular fat pad, and epididymis. Based on the hamster's age and the type and distribution of the lymphoma, a presumptive diagnosis of hamster polyomavirus–induced lymphoma was made. A specific polymerase chain reaction (PCR) was developed, which confirmed the diagnosis. An in situ PCR demonstrated hamster polyomavirus DNA within lymphocytes of the multicentric lymphoma and renal tubular epithelial cells and within clusters of enterocytes in the jejunum. These data are consistent with environmental dissemination of hamster polyomavirus virions through the renal tubular epithelium and into the urine and with fecal shedding of hamster polyomavirus virions; however, additional studies will be needed to confirm these observations.

Key words: Hamster polyomavirus; in situ PCR; lymphoma; Mesocricetus auratus; polyomavirus; Syrian hamsters.

Request reprints from Dr. J. H. Simmons, RADIL, Veterinary Medicine Building Room E108, 1600 East Rollins Road, Columbia, MO 65211 (USA). E-mail: simmonsjh{at}missouri.edu.

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