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For centuries, people believed that an unseen force called “miasma” or ‘bad air’ caused plagues and deaths. When hit by waves of the Plague, many towns hired Plague ‘doctors’, who wore a special costume. The beak-like pouch held herbs that were thought to protect the 'doctors' against the ‘miasma’. A wooden cane stick was used to examine the patients without direct touching. Right notions, but wrong conclusions. The ‘miasma’ theory later vaporized to give way to the germ theory of disease.
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His lenses were remarkably good, and gave magnifications of up to 300x (1676)
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He observes that milkmaids who got cowpox infections were spared from smallpox. Takes cowpox lesion material from a milkmaid and vaccinates a young boy, James Phipps. Six weeks later, he exposes the boy to pus from a smallpox victim. Luckily (especially for the kid), Jenner’s hypothesis was correct – James Phipps did not get smallpox!
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Childbearing women were always at risk for childbed/puerperal fever, but the incidence increased when women started delivering babies in hospitals. Noticing that women in wards managed by doctors were four times more likely to develop the disease than in wards managed by midwives, Semelweis reasoned that doctors, who went to the wards after performing autopsies, were actually transferring the 'poison' (now we know it is bacteria) to the delivery rooms.
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At that time, there was no consensus on what caused cholera, and treatments were completely random. Using meticulous reasoing, graphs and maps, Snow showed that Cholera was
caused by contaminated water, and not by "miasma" or 'foul air'.
Extra extra: Two excellent sources (and a must read for anyone interested in infectious diseases) about John Snow: (1) http://www.ph.ucla.edu/epi/snow.html and (2) “The medical detective” by Sandra Hempel. -
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He develops the method of 'pasteurization' to destroy unwanted microbes in wine. His contributions places the germ theory of disease on a firm scientific footing. He demonstrated the basis of parasitic diseases in silk worms, determined the cause of rabies and developed a vaccine for it, and developed immunization methods to prevent chicken cholera. Pasteur also discovered anaerobiosis, and developed a vaccine for anthrax.
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Koch pioneered the methods for preparing microscopic slides and photographing bacteria, and developed the technique for isolating pure bacterial cultures by streaking them on solid plates. In 1890, he presented the eponymously named 'Koch's postulates' for determining whether a given organism caused a specific disease. Koch is awarded the Nobel Prize for Medicine in 1905 (Source: Gut Microbes, July/August 2011).
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Lederberg & Tatum receive the Nobel Prize in 1958, (with George Beadle).
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To prove this, Barry Marshall ingested a culture of H. pylori, and developed disease symptoms in five days.
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