Scientists have grappled with the idea that viruses could cause human cancer for at least 70 years, but only within the last 10 years have they accorded it widespread respectability. The idea was suspect for so long because cancer in humans simply did not behave like other diseases of viral origin. It did not appear to be infectious, and there were no confirmable isolations of a causative virus. During that time, however, a comparative handful of pioneers accumulated evidence that proved that viruses did in fact cause cancer in animals. So the recurring question was: If viruses can cause cancer in animals, then why not in humans?
KeywordsCervical Cancer Genital Herpes Infectious Mononucleosis Photodynamic Inactivation Defective Virus
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