Which of the following statements is true about the epidemological determinants of measles ?

Ans. is 'c' i.e., Secondary attack rate is less than that of rubella SAR of some impoant infectious diseases o Measles 80% o Rubella 90 - 95% o Chicken pox - 90% o Peussis - 90% o Mumps - 86% About other options o The measles virus cannot survive outside the human body for any length of time. But it retains infectivity when stored at sub - zero temprature. The only source of infection is a case of measles, carriers are not known to occur. Incidence of measles is same in males and females.