Infectivity period of measles is:: (A) 2 days before and 4 days after appearance of rash, (B) 4 days before and 5 days after appearance of rash, (C) 4 days before and 1 days after appearance of rash, (D) Entire incubation period
Answer is B. Infectivity period :-:Period of communicability is the time during which an infectious agent may be transferred directly or indirectly from an infected person to another person Measles patients are infectious from 4 days before to 5 days after the onset of rash. Infectivity period of other diseases:- Chicken pox patients are infectious from 2 days before 5 days after the onset of rash. Mumps patients are infectious from 1 week before to 2 weeks after the onset of parotitis. Rubella patients are infectious from 1 week before to 1 week after the onset of rash.