Professor Paul W. Ewald proposed stealth infections as the cause of cancers and heart disease in his popular 2000 book, Plague Time. At that time, he reported that less than 5 percent of human cancers are known to be caused by something other than an infectious agent. The role of viruses in causing some cancers is well established. For cervical cancer, we already have a vaccine available. For many other types of cancer, infectious agents are suspect. Most of these infectious agents are viruses, but bacteria, fungi, and protozoa are also possibilities.
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