Wild house mice (Mus musculus) from one trapping area in southern California had a much higher incidence of spontaneous lymphoma and a markedly higher incidence of murine type C virus particles and group-specific antigen in their spleens than did wild mice of comparable age from several other areas. This association strongly supported an etiologic role for the indigenous type C virus in naturally occurring murine lymphoma.
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Gardner et al. (1973) studied this question.