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6 Cards in this Set

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Describe the two main modes for entry of Yersinia pestis into the host and the differences in the subsequent disease process.
There are two different modes of entry of Yersinia Pestis into the host, that of bubonic plague and that of pneumatic plague. In bubonic plague Y.pestis enters the host by a bite from an infected flea, which travels to the nearest lymph node and is spread from there, while in pneumatic plague enters the host through the aerosol mechanism and enters directly into the lungs. Pneumatic plague spreads much quicker,with a 100% mortality rate in the first day; bunonic is much slower.
What are teh etiologic agent, reservoir and vector for Lyme disease? What causes the most problematic damage to the host?
The etiologic agent of Lyme disease is Borrelia burgdorferi. The reservoirs are deer and field mice. and the vector is a tick. The etiologic agent, Borrelia burgdorferi, causes the most damage to the host.
What is the etiologic agent of tuberculosis?
The etiologic agent of tuberculosis is Mycobacterium tuberculosis.
How does the bacterium avoid killing by phagocytes?
The bacterium avoid killing by phagocytosis by resistance to oxidative killing, inhibition of phogosome-lysosome fusion, and inhibition of diffusion of lysosomal enzymes.
How has HIV I contributed to the recent increases in tuberculosis morbidity and the spread of multiple drug resistance?
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Compare and contrast the mechanisms of "antigenic variation" by Neisseria gonorrhoeae with "antigenic drift" and "antigenic shift" by influenza virus.
In the 'antigenic variation' of Neisseria gonorrhoeae programmed recommbination of pil genes alter the pilus. In the Influenza virus, 'antigenic drift' causes the accumulation of mutations and 'antigenic shift', the multipartite genome makes packaging of hybrid viral DNA possible; causes more sickness and quicker package; no herd immunity.