system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A couple has 4 children, all unvaccinated for Measles. A child got Measles on 5 August 2015. Two other children developed Measles by 15 August 2015. Secondary attack rate is:
assistant
The correct answer is  In the given question, One primary case given rise to two secondary cases Total susceptible = 3 (4 children minus primary case) SAR = No. of secondary cases/ Total susceptibles X 100 So, SAR = 2/3 X 100= 66.6%