Word: viruses
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Dates: during 1920-1929
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...cultures of a microorganism found in the gall. He is convinced that human cancers are caused by a similar infection, though no active parasite, either bacterium or protozoon, has yet been found. Many investigators of plant and animal cancer have caused cancer experimentally in varied ways-by injecting a virus from the growths, by painting rats with irritating substances, and by nematodes (microscopic worms), tape worms, other parasites. In short, Dr. Smith's theory is that at least some cancer is caused by the irritation of parasites acting upon organs unable to withstand it on account of inherited...