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Santa Elena is a seacoast community with a population of 99,000. Its residents can be divided into three age groups: 25-44, 45-64, and 65+, each comprising one third of the population. In 1990, 100 cases of hepatitis A occurred in Santa Elena and were traced to the consumption of contaminated oysters. Of these 100 cases, 20 between the ages of 25 and 44, 10 between the ages of 45 and 64, and 5 over the age of 64 ultimately proved fatal. Prior to 1990, Santa Elena had never reported a case of hepatitis A. (Knapp and Miller, 1992)5. There were 6000 deaths in Cook County, which had a population of 2.5 million in 1991. Here is a description of the causes of death 1250 leukemia . 1750 stroke . 250 pneumonia 250 Hodgkins disea 2500 myocardial infarction Calculate the cause-specific mortality rate for acute myocardial infarction in Cook County 6. The proportionate mortality for leukemia in #5 above is In Bergen County, there were 500 HIV-positive people of whom 5 died within a year after their initial diagnosis. The case-fatality for HIV is what in Bergen County? Number of cases and deaths from influenza in a Texas County in 1991 Age Group 1-30 31-60 61+ Total Cases 10 50 30 90 Deaths Population 30 20 5,000 1,000 a. Calculate the crude mortality rate for influenza in this town b. Calculate the age-specific mortality rate for people 31-60 years 1,000 C. What age group has the highest case fatality?

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