Viruses in the aetiology of cancer.
D002051:Burkitt Lymphoma / Q000209:etiology; D006564:Herpesviridae; D004854:Herpesvirus 4, Human; D007938:Leukemia / Q000209:etiology*; D009369:Neoplasms / Q000209:etiology*; D009858:Oncogenic Viruses; D012190:Retroviridae