<prompt> In a village of 100 children, 60 are immunized against measles. One child travelled and returned with measles and infected other 26 children. What is the secondary attack rate -67275080  <response>: Ans. is a i.e., 67 Total children 100 o Immunized children 60 o Primary case 1 o Total no. of susceptible contacts 100 - 601 39 o No. of Susceptible developed disease 26 26 SAR ___ x 100 67 39 