During a food-borne outbreak, 20 of 100 people who ate at a community meal become ill. What is the attack rate among those who ate the meal?
Correct answer: C. 20 percent
- A. 5 percent
- B. 10 percent
- C. 20 percent
- D. 50 percent
Explanation
Attack rate equals the number of ill people divided by the number exposed, multiplied by 100. The calculation is 20 ÷ 100 × 100 = 20 percent, which helps compare illness among exposed groups.
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About Communicable Diseases
Communicable diseases are studied through the chain of infection, including the agent, reservoir, mode of transmission, portal of entry and susceptible host. Coverage includes isolation, disinfection, immunization, surveillance and outbreak control, with attention to diseases such as tuberculosis, malaria, hepatitis, polio and diarrheal infections.
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