Social & Preventive Medicine General c9b780c9 True about measles are all except ? A Koplik's spots is pathognomonic B Source is a case C Infectivity is low D Affect age group 1 to 3 years High-Yield Explanation Ans. is 'c' i.e., Infectivity is low Measles has high infectivity with secondary attack rate of 80%. Other options are correct.