Epidemiology & Prevention USMLE Step 1 Practice Question
After a wedding reception, 96 guests are interviewed about acute gastroenteritis. Of the 60 guests who ate the shrimp appetizer, 36 became ill. Of the 36 guests who did not eat the shrimp appetizer, 6 became ill. Which of the following is the attack rate among those who ate the shrimp appetizer?
Answer choices
- A6/36
- B42/96
- C36/60Correct answer
- D36/96
- E60/96
- F30/60
See the full explanation
Get the correct-answer rationale, why each distractor is wrong, the underlying mechanism, and high-yield associations — plus adaptive practice that targets your weak areas — with a free MedBoardPRO account.