PH 101 Cheat Sheet.docx - Lecture 1 Epidemiology is the...

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Lecture 1: - Epidemiology is the study of how disease is spread in population - John Snow - English physician who studied cholera - the Broad Street pump making ppl sick b/c of the water - dad of Epidemiology - Snow’s Approach - find patterns, examine exceptions, observations to interventions - Prevention: - Primary : controlling risk factors - Secondary : prevention of disease symp. - Tertiary : showing clinical signs & symp. Lecture 2: - Epidemiological Triad - Host: organism w/ disease - Environment: external factor - Agent: microbe causing disease (virus) - Vector: organism that transmit to human - Chain of Transmission - Direct: person to person - Indirect: airborne, foodborne, vector tran. - Endemic: normal disease occurrence - Epidemic: abnormal disease occurrence - Pandemic: epidemics all around the world - Outbreaks: sudden excess of diseases - Attack Rate # of sick ppl # of ppl who could become sick - used when disease occurrence increases in a short time - Highly effective vaccines = freeloaders Lecture 3: - Passive surveillance : ppl go to hospital - Active surveillance: medical go to ppl - Early Diagnosis: - Technically it’s feasible - Morbidity: disease in a population - Mortality: death in a population - Ratio: numerator doesn’t have to be in denominator - Proportion: it’s a ratio but the numerator is in the denominator - Rate: numerator is the # of new events, denominator is the at risk population at the time - Incidence (NEW CASES) New disease cases in the pop. per unit time Susceptible ppl in the pop. per unit time -

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