<prompt> Which of the following statements is true about the epidemological determinants of measles ?Measles virus survives outside the human body for 5 daysCarriers are impoant sources of infectionSecondary attack is less than that of rubellaIncidence of measles is more in males than females  <response>: 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. 