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What is Typhus? Chills Cough High Fever Joint Pain Low BP Severe Headache/Muscle Pain Stupor Delirium Rash that begins on chest and spreads to limbs (but not palms of hands or soles of feet)
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What causes Typhus? Rickettsia prowazekii: epidemic typhus Rickettsia typhi : endemic (murine) typhus Gram (-), non-motile, obligate intracellular parasite, aerobic bacteria
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Fun Fact: Rickettsia prowazekii and the origin of mitochondria Andersson et al (1998) Similar functional profile of genome to mitochondria Similar ATP production mechs Possible insight into endosymbiosis
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History of Typhus Commonly found in prisons/crowded areas Lends to its common name of “Jail Fever”
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Where Does Typhus Occur?
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How Does Typhus Spread? Two modes of transmission: Epidemic typhus – Lice to humans Endemic typhus – Fleas to humans
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Rickettsia-Host Cell Interaction Entry: Interaction with Outer Membrane Protiens Phagocytosis
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Escape from Phagosome and Spread to Other Cells Lysing of Phagosomal Membrane Divide by Binary Fission Spread due to burst of cell Lack Actin- Polymerization machinery
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Natural Defense and Rickettsial Survival
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When Things Go Bad
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Diagnosis Should be made based on clinical findings Complete blood count to check for anemia/low platelets Test for increased levels of typhus antibodies
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Treatment Easily treated with a mix of broad- spectrum antibiotics Most common include doxycycline, tetracycline and chloramphenicol. Originally, vaccine dangerous to produce, now just not worth it
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Prognosis Infrequent relapses Without treatment, death resulted in 10- 60% of cases for epidemic typhus <2% for endemic typhus Prompt treatment leads to prompt recovery
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Prevention Good Hygiene Avoid areas where one may encounter rats/fleas and lice. Bathe regularly Use insecticides Wash clothes regularly
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References Anderson et al. “The genome sequence of Rickettsia prowazekii and the origin of mitochondria”. Nature 396. (1998) pg 133-140. Immunopaedia.org, 2010. Web. 4 April 2012. http://www.immunopaedia.org.za/index.php?id=257 http://www.immunopaedia.org.za/index.php?id=257 Mayer, Gene. Microbiology and Immunology. Columbia, SC: The Board of Trustees of the University of South Carolina, 2010. Parola, Philippe and Didier Raoult. Rickketsial Diseases. Informa Healthcare, 2007. “Rickketsia”. Wikipedia, The Free Encyclopedia. Wikimedia Foundation Inc. 21 Feb 2012. Web. 4 April 2012. “Typhus”. Wikipedia, The Free Encyclopedia. Wikimedia Foundation, Inc. 30 March 2012. Web. 4 April 2012.
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