A village has a total of 100 under-five children. The coverage with measles vaccine in this age group is 60%. Following the occurrence of a measles case in a child after a visit outside, twenty six children developed measles. The secondary attack rate ofmeasles is -: (A) 25%, (B) 40%, (C) 50%, (D) 65%
Answer is D. Ans. is 'd' i.e., 65 %