Chapter 7 - Control of Microbial Growth Chapter 7 History...

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Control of Microbial Growth Chapter 7
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History Humans vs. Microbes infections diseases plagues epidemics pandemics
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Nursery Rhyme Ring- a - ring of rosies Pocketful of posies Achoo ! Achoo ! We all fall down.
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Bubonic Plague or the Black Death Epidemic swept thru Europe in the Middle Ages (13th and 14th centuries) 40 million people were killed About 1/3 of the population of the continent Etiological agent: Yersinia pestis Gram (-) rod 2 Vectors Rat Flea
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Yersinia pestis - Gram (-) bacillus Vectors - Rat and Flea
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Bubonic Plague Infection 1. Flea bite with Yersinia pestis 2. Bacteria multiply in the bloodstream Bacteremia 3. Bacteria localize in lymph nodes, especially axillary and groin areas
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4. Hemorrhaging occurs in lymph nodes, resulting in “black and blue” swellings or Buboes (hence the name Bubonic Plague or Black Death)
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Bubonic Plague Infection 5. If untreated, about 50 % Mortality Rate 6. If bacteria spread to the lungs, it becomes Pneumonic Plague and is now highly contagious (Almost a 99 % Mortality Rate)
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Nursery Rhyme Ring - a - ring of rosies, A pocketful of posies Achoo ! Achoo !
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Chapter 7 - Control of Microbial Growth Chapter 7 History...

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