Topic 13 Chp13_HostMicrobeP

Topic 13 Chp13_HostMicrobeP - Chapter 13 Microbe-Human...

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Unformatted text preview: Chapter 13 Microbe-Human Interactions Contact with Microbe through Portal of Entry Each portal is ‘defended’ by nonspecific and specific host defenses “Natural” Portals of Entry [Pathogen has ‘evolved’ w/ natural portals] Inhalation [respiratory tract] Ingestion [alimentary tract] Sexual contact [genitourinary tract] Wounds [skin] Insect bites [skin] “Manmade” portals of entry Parenteral exposure- Surgery- Hypodermic needles - Catheters Tissue transplant- Blood - Solid organ Cosmetic choices- Body piercing- Tattoos Outcome of Host-Microbe Encounter = “Balancing act” Host defenses hold microbe’s growth in check. Microbe successfully evades host defenses; its growth damages host. Microbe + Human = Symbiotic relationships Normal (resident) microflora • Commensalism • Mutualism Pathogens • Parasitism- microbe benefits- animal harmed- animal (i.e., human) becomes diseased Will microbial exposure result in disease?...
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This note was uploaded on 01/23/2010 for the course BIO 307D taught by Professor Moore during the Fall '09 term at University of Texas.

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Topic 13 Chp13_HostMicrobeP - Chapter 13 Microbe-Human...

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