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Lecture 38.docx

2 Pages

Natural Science
Course Code
NATS 1670
Motti Anafi

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Human Virology Viruses are the most common cause of acute infections in humans What are viruses? • Obligate intracellular parasites o They cannot perform metabolism on their own. • Viruses are simple Darwinian machines. They survive because they make huge amount of mutants. Selection removes the non-fittest. • Many viral diseases can be viewed as a failure of the virus to adapt to its host. The Origins of Virology • A hieroglyphic found in 3700 BC, Memphis ancient Egypt. Typical clinical signs of paralytic poliomyelitis • Ramesses V’s preserved mummy shows that he died of smallpox at about the age of 35 in 1143 BC. • The Chinese suffered from small pox in 1000 BC, China. They realized they can do something about it. Variolation. • 1519 A.D Smallpox was transferred from Europe to the Americas • The Year 1796. Edward Jenner vaccinated a boy against smallpox boy, with material from a cowpox lesion. • The Year 1892. Dmitri Iwanowski, showed that extracts from diseased tobacco plants can transmit disease to other plants by infectious agent smaller than a bacteria. • The 1918 Spanish Flu
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