<prompt> True about measles is all exceptKopliks spots appear as rash disappearsIt is prevented by both active and passive immunizationOtitis media and meningitis are the most common complicationsTB is aggravated in post measles  <response>: Measles Rubeola: Incubation period: 10-14 days. Causative agent: RNA Paramyxovirus so for only one serotype known Source of infection: Cases Carriers are not known to occur Period of communicability: 4 days before and 5 days after the appearance of the rash. Rash is retroauricular in origin Measles has no second attacks life long immunity is seen Secondary attack rate of measle is 80 Measles shows a cyclical trend: Increases every 2-3 years. Blood cell type predominantly infected in Measles: Monocyte. Pathognomic clinical feature: Koplik spots on buccal mucosa opposite Lower 2nd molar Pathognomic microscopic feature: Wahin Finkedly cells Multinucleated giant cells MC complication of measles in young children: Otitis media. SSPE: Subacute sclerosing pan Encephalitis. Is a rare complication of measles: 1 per 10000-100000 cases of Measles 7-10 years after initial infection Epidemic of measles occur: If propoion of susceptible children is 40 If measles is introduced in a virgin community it infects 90 of children. Eradication of measles: Requires a vaccination coverage 96 Baby measles Exanthem subitum-roseola infantum: Sixth disease 3 day fever Ref: Park 25th edition Pgno: 159 