<prompt> Measles is said to be infectious4 days before appearance of rashAfter 4 days of rash4 days before and 5 days after rash appearanceOnly during the incubation period  <response>: Measles transmission Measles case is infective 4 days before to 5 days after appearance of rash More commonly seen in winters and early spring in India Incubation period : 10-14 days Only one type of vaccine Live attenuated Ref: Park 25th edition Pgno : 159-162 