Week 1 HW 1.docx - QUESTION 1 1 Gordis Chapter 2 pages...

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QUESTION 1 1. Gordis Chapter 2 pages 35-36. Questions 1-5. Endemic means that a disease Occurs clearly in excess of normal expectancy Is habitually present in human populations Exhibits a seasonal pattern Is prevalent among animals 1 points QUESTION 2 1. The first table shows the total number of persons who ate each of two specified food items that were possibly infective with group A streptococci. The second table shows the number of sick persons (with acute sore throat) who ate each of the various specified combinations of the food items. Total Number of Persons Who Ate Each Specified Combination of Food Items Ate Tuna Did Not Eat Tuna Ate Egg Salad 75 100 Did not Eat Egg Salad 200 50 2. Total Number of Persons Who Ate Each Specified Combination of Food Items and Who Later Became Sick ( with Acute Sore Throats) Ate Tuna Did Not Eat Tuna Ate Egg Salad 60 75 Did not Eat Egg Salad 70 15 3. 4. 1. What is the sore throat attack rate in persons who ate both egg salad and tuna? 60/75 70/200 60/135 60/275 None of the above
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1 points QUESTION 3 1. The first table shows the total number of persons who ate each of two specified food items that were possibly infective with group A streptococci. The second table shows the number of sick persons (with acute sore throat) who ate each of the various specified combinations of the food items. According to the results shown in the preceding tables, which of the following food items (or combinations of food items) is most likely to be infective? Total Number of Persons Who Ate Each Specified Combination of Food Items Ate Tuna Did Not Eat Tuna Ate Egg Salad 75 100 Did not Eat Egg Salad 200 50 2. Total Number of Persons Who Ate Each Specified Combination of Food Items and Who Later Became Sick ( with Acute Sore Throats) Ate Tuna Did Not Eat Tuna Ate Egg Salad 60 75 Did not Eat Egg Salad 70 15 3. Tuna only Egg Salad only Neither tuna nor egg salad Both tuna and egg salad Cannot be calculated from the data given 1 points QUESTION 4 1. In the study of an outbreak of an infectious disease, plotting the epidemic curve is useful because: It helps to determine what type of outbreak (e.g., single-source, person-to-person) has occurred It shows whether herd immunity has occurred It helps to determine the median incubation period. a and c a, b, and c 1 points QUESTION 5 1. Which of the following is characteristic of a single-exposure, common- vehicle outbreak?
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Frequent secondary cases Increasing severity with increasing age Explosive Cases include both people who have been exposed and those who were not exposed All of the above 1 points QUESTION 6 1. 1. At an initial examination in Oxford, Mass., migraine headache was found in 5 of 1,000 men aged 30 to 35 years and in 10 of 1,000 women aged 30 to 35 years. The inference that women have a two times greater risk of developing migraine headache than do men in this age group is: Gordis Epidemiology Chapter 3 Pages 56-57 Correct Incorrect, because a ratio has been used to compare male and female rates Incorrect, because of failure to recognize the effect of age in the two groups
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