There are six families of animal viruses capable of directly causing cancers in either animals or humans. These viruses are generally termed as tumor viruses. These tumor Viruses replicate their machinery into host cells and lead to abnormalities causing tumors and different cancers. Viruses that can lead to human cancers are HPV, Epstein-Barr virus (EBV), Kaposi's sarcoma-associated herpesvirus (KSHV), Oncovirus, etc.
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