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Investigation of an outbreak of prolonged febrile illness in medical center personnel at the University of Rochester School of Medicine and Dentistry revealed lymphocytic choriomeningitis (LCM) virus to be the causative agent. Syrian or golden hamsters (Mesocricetus auratus) were found to be the only animals involved in maintaining the virus and were the source of human infections. Isolations of LCM virus were made from autopsy specimens of 13 of 46 (28%) golden hamsters. Virus isolations were made from 22 of 28 (79%) frozen specimens of 11 tumor lines transplanted repeatedly in golden hamster cheek pouches. No virus isolations were made from 86 autopsied laboratory mice, laboratory rats, Chinese hamsters (Cricetulus griseus), or laboratory rabbits or from 10 tumor cell lines transplanted in laboratory mice. Complement-fixation testing of 301 animal sera from the vivarium also revealed involvement primarily of golden hamsters. The probable source of virus introduction into the Rochester facilities was found to be two LCM-contaminated tumor lines sent from a biological supplier to Rochester in 1969.
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