polyoma virus

(redirected from mouse parotid tumor virus)
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pol·y·o·ma vi·rus

a small naked virus with double-stranded circular DNA (genus Polyomavirus, family Papovaviridae) that normally occurs in inapparent infections in laboratory and wild mice, but after growth on tissue culture is capable of producing parotid tumors in mice and sarcomas in hamsters as well as tumors in other laboratory animals.