Viruses and tumours.
D000818:Animals; D002051:Burkitt Lymphoma / Q000209:etiology; D006224:Cricetinae; D006801:Humans; D007938:Leukemia / Q000209:etiology*; D008223:Lymphoma / Q000209:etiology*; D009369:Neoplasms / Q000209:etiology*; D014780:Viruses