251 epidemiology - Chapter 14 Principles of Disease and...

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Unformatted text preview: Chapter 14 Principles of Disease and Epidemiology Principles of Disease and Epidemiology Pathology Study of disease Etiology Study of the cause of a disease Pathogenesis Development of disease Infection Colonization of the body by pathogens Disease An abnormal state in which the body is not functionally normally Transient microbiota may be present for days, weeks, or months Normal microbiota permanently colonize the host Symbiosis is the relationship between normal microbiota and the host Normal Microbiota and the Host In commensalism, one organism is benefited and the other is unaffected. In mutualism, both organisms benefit. In parasitism, one organism is benefited at the expense of the other. Some normal microbiota are opportunistic pathogens. Normal Microbiota and the Host: Figure 14.2 Locations of normal microbiota on and in the human body Normal Microbiota and the Host: Microbial antagonism is competition between microbes. Normal microbiota protect the host by: occupying niches that pathogens might occupy producing acids producing bacteriocins Probiotics are live microbes applied to or ingested into the body, intended to exert a beneficial effect. Normal Microbiota and the Host: Koch's Postulates are used to prove the cause of an infectious disease. Kochs Postulates Figure 14.3.1 Koch's Postulates are used to prove the cause of an infectious disease. Kochs Postulates Figure 14.3.2 Classifying Infectious Diseases Symptom A change in body function that is felt by a patient as a result of disease Sign A change in a body that can be measured or observed as a result of disease....
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This note was uploaded on 01/16/2012 for the course BIOLOGY 251 taught by Professor Lancebowen during the Fall '10 term at Truckee Meadows Community College.

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251 epidemiology - Chapter 14 Principles of Disease and...

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