Question 1 Endemic means that a disease: a. Occurs clearly in excess of normal expectancy b. Is habitually present in human populations c. Affects a

Question 1 Endemic means that a disease: a. Occurs clearly in excess of normal expectancy b. Is habitually present in human populations c. Affects a large number of countries simultaneously d. Exhibits a seasonal pattern e. Is prevalent among animals Table who ate egg salad & who did not eat egg salad 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 Total number of persons who ate each specified combination of food items & 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 Question 2 What is the sore throat attack rate in persons who ate both egg salad & tuna? a. 60/75 b. 70/200 c. 60/133 d. 60/275