<prompt> All of the following statement regarding measles are true except -a Rash appears first on legb Koplik spot are seen on retinac Long term complication may be seen in form of SSPEd Caused by RNA viruse I-P is 2-3 daysabcbcdcdeabe  <response>: Measles Measles is caused by a RNA virus of paramyxovirus.Measles in also known as rubellaThe only source of infection is a case of measles, carriers are not known to occur.Infective period 4 days before and 5 days after the appearance of rash.Infective material Secretions of nose, throat and respiratory tractAge group 6 month to 3 years.Immunity One attack of measles generally confers lifelong immunity. Transmission Droplet infection through respiratory tractInfection through conjunctiva.Incubation period 10 days from exposure to onset of fever.14 days from exposure to appearance of rash.7 days for live vaccine of measles.Clinical manifestations1 Prodromal stageBegins 10 days after the infection and lasts until day 14.Characterized by fever, coryza with sneezing and nasal discharge, redness of the eyes, lacrimation and photophobia.A day or two before the appearance of rash, Kopliks spots appear on buccal mucosa opposite the 1st and 2nd lower molars.Kopliks spots are pathognonzonic of measles.2 Eruptive phaseMaculopapular rash which begins behind the ear and spread rapidly in a few hour over the face and neck extends doWn the body.3 Post measles stageWeight loss Growth retardation DiarrheaCancrum oris Reactivation of pulmonary TB Candidiasis 