The following is an example of what kind of study? Participants are recruited based on exposure status as ascertained through historical records (medical records or other records from the past), disease status is determined after recruitment, and risk of disease among the exposed is then compared with risk in the unexposed. a) Ecological study b) cross-sectional study c) case control study d) cohort study e) randomized control trial

The following is an example of what kind of study? Participants are recruited based on exposure status as ascertained through historical records (medical records or other records from the past), disease status is determined after recruitment, and risk of disease among the exposed is then compared with risk in the unexposed. a) Ecological study b) cross-sectional study c) case control study d) cohort study e) randomized control trial

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Calculating Incidence versus Prevalence The picture represents 10 new cases of illness over about 15 months in a population of 20 persons. Each horizontal line represents one person. The down arrow indicates the date of onset of illness. The solid line represents the duration of illness. The up arrow and the cross represent the date of recovery and date of death, respectively. The picture New: Cases of Illness from October 1, 2004–September 30, 2005 Question: Calculate the incidence rate from October 1, 2004, to September 30, 2005, using the midpoint population (population alive on April 1, 2005) as the denominator. Express the rate per 100 population.
You are studying a population of wild coyotes and notice that every three years there is an epidemic of bacterial disease. Which of the following is the most likely explanation for this periodic cycling of the disease ? A) New coyotes, which are suceptible to the disease, are continously born into the population B) Coyotes are dying from other causes over time. C) During an outbreak the proportion of coyotes who are infected slowly falls as they recover D) Coyotes from other populations who have already been infected and recovered from diseases immigrate into the study population
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