Which of the following statements is true about the epidemological determinants of measles -
<p> Measles epidemiologic determinants:- AGENT FACTORS:- 1. Agent-RNA paramyxovirus. Only one serotype . The virus cannot survive outside the human body for any length of time. 2. Source-case of measles. 3. Infective material-Secretions of nose,throat and respiratory tract. 4. Communicability- 4 days before the appearance of rash to 4 days after. 5. Secondary attack rate-infection confers life long immunity. HOST FACTORS:- 1. Age- affects viually everyone. More incidence seen in children between 6 months-3years. 2. Sex- equal incidence. 3. Immunity- one attack provides life long immunity. Infants protected upto 6 months of age. 4. Nutrition-severe in malnourished children. Possibly due to poor cell mediated immunity. {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.147}</p>
Communicable diseases
Measles virus survives outside the human body for 5 days
Carriers are impoant sources of infection
Secondary attack is less than that of rubella
Incidence of measles is more in males than females
Secondary attack is less than that of rubella