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lecture 3 Epidemiology of Infectious Diseases

lecture 3 Epidemiology of Infectious Diseases -...

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Epidemiology of Infectious Diseases: Principles and Examples Lecture 3
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Epidemiology of infectious disease Human history has been punctuated by epidemics - -sudden outbreaks of infectious disease This has led directly to the science of epidemiology : the study of disease within populations Major task of Health Departments and the Centers for Disease Control (CDC)
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First Study First ever studied for epidemiological purposes – London cholera outbreak 1854 Father of epidemiology – John Snow John Snow, 1854 Cartoon of Broad  Street Pump in  London – source of  cholera outbreak  1854
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Methodology Incidence : # of new diseased people during a span of time (indicates spread of disease) Prevelance : total number of diseased people at any time (includes both old and new cases) Morbidity : # diseased people during a set period of time in relation to total population Mortality : # deaths of diseased people during a set period of time
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Methodology: Notifiable Diseases those diseases that health care workers must report to public health officials
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Frequency Patterns Sporadic diseases occur with no predictable pattern Endemic diseases occur with a constant frequency within certain populations (Example: mumps) Epidemics occur when the cases of a certain disease increases significantly Pandemics such as influenza and AIDS sometimes occur. Epidemics that spreads worldwide.
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