<prompt> A 2 year old unimmunized child present to a primary health center with fever since 5 days. Mother also give a history of rash staing behind ear- pinna a day before coming to OPD. On examination, child is having running nose and congested eyes. Most probable diagnosis is:-MeaslesMumpsRubellaChicken pox  <response>: MEASLES:- Incubation period: 10 - 14 days Causative agents: RNA paramyxovirus Sources of infection: cases carriers are not known to occur Period of communicability :4 days before 5 days after the appearance of rash Rash: Retro - auricular origin Measles has no second attacks life long immunity seen Pathognomic clinical feature of measles: Koplik spots on buccal mucosa opposite lower 2nd molar Other clinical features: Coryza, fever, Red eye, Cough MC complication of measles in young children: Otitis media. 