VIRUSES - In the early 1892 a virus was proved to cause a...

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VIRUSES     As nineteenth century microbiologists worked to isolate causative agents of various diseases, in  some cases they found that they seemed to be unable to find an associated microbe to grow in lab  media. However, they could filter infectious material from one host through a filter designed to  trap bacteria, and then use the filtered material to cause the disease in a healthy susceptible  animal. Some believed that these causative agents must be very tiny bacteria, but others  suspected that a completely different pathogen was involved. Pasteur called this unknown agent  by the name virus, meaning Latin for poison. Sometimes, because whatever it was could pass  through filters, it was called a filterable virus. 
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Unformatted text preview: In the early 1892, a virus was proved to cause a plant disease, tobacco mosaic disease. The first animal disease proved to be caused by a virus was foot and mouth disease in 1898. In 1901, Walter Reed proved that a virus was responsible for a human disease, yellow fever. We now know that many diseases of plants, domestic animals and humans are caused by viruses. We probably have not yet identified all viruses that affect humans. Several newly discovered viruses include HIV (AIDS virus), Hantavirus in the form that occurs in the American Southwest, Venezuelan hemorrhagic fever, and Ebola fever virus....
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