If 20 new cases occur in a population at risk of 1000 during a defined period, what is the attack rate?

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Prepare for the USAF Public Health Operations Block 1 Test. Use flashcards and multiple choice questions with detailed explanations. Achieve confidence and readiness for your examination!

Multiple Choice

If 20 new cases occur in a population at risk of 1000 during a defined period, what is the attack rate?

Explanation:
Attack rate is the proportion of a population at risk that develops the disease during a defined period, expressed as a percentage. Here, 20 new cases occur among 1,000 people at risk, so attack rate = (20/1000) × 100% = 2%. This shows the risk within that specific population over that time frame. The other options would correspond to different counts (for example, 200 cases would be 20%, 2 cases would be 0.2%), or an impossible percentage over 100%.

Attack rate is the proportion of a population at risk that develops the disease during a defined period, expressed as a percentage. Here, 20 new cases occur among 1,000 people at risk, so attack rate = (20/1000) × 100% = 2%. This shows the risk within that specific population over that time frame. The other options would correspond to different counts (for example, 200 cases would be 20%, 2 cases would be 0.2%), or an impossible percentage over 100%.

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