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Topic 17 Chp13_EpidemiologyP

Topic 17 Chp13_EpidemiologyP - Introduction to Epidemiology...

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Unformatted text preview: Introduction to Epidemiology Epidemiology: Study of disease transmission within populations Microbes transmitted from their natural reservoir to new host through various routes. . Pathogens have evolved an “Exit Plan” Direct contact Indirect contact Biological vectors vs. Mechanical vectors Pathogen replicates to high numbers in biological vector as part of microbe’s life cycle . . . Pathogens do NOT replicate in mechanical vectors Vocabulary describing disease in populations Morbidity rate measures diseased people- Incidence: new disease cases/time- Prevalence: total disease cases/time- Note: illness must be detected/reported Surveillance [passive vs. active] HIV surveillance is ‘active’ Mortality rate measures number of deaths Disease Rate as a Measure of an Epidemic Morbidity rate Prevalence = Total no. of cases Total no. of people in population Incidence = Total no. of new cases Total no. of people in population...
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Topic 17 Chp13_EpidemiologyP - Introduction to Epidemiology...

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