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View full size image. Viruses may be causing more cancers than previously thought, according to a new study. Scientists know that a few cancers, such as cervical cancer, are caused by viruses, because researchers have isolated the viral genomes from the cancerous cells. But some viruses may take a hit and run approach â inducing cancer and then vanishing before the disease is caught, the researchers say.
Eighty percent of all infection-caused cancers were in less developed regions, where vaccines and treatments for these infections may be harder to come by, and sometimes the numbers are shocking: in China, more than a quarter of cancer cases were infectious in origin.y Veronique Greenwood | May 9, 2012 3:03 pm. Where viruses and bacteria cause cancer. Strictly speaking, cancer is not contagious. But a fair number of cancers are clearly caused by viral or bacterial infections: lymphomas can be triggered by the Epstein-Barr virus, which also causes mononucleosis.