<prompt> Most common life threatening complication of measles is:CroupMeningoencephalitisOtitis mediaPneumonia  <response>: 1. Measles: RUBEOLA- Incubation period varies from 8 to 12 days. Measles is a highly contagious febrile illness. 2. Complications of measles: Complications include otitis media, bronchopneumonia, laryngotracheobronchitis croup, and diarrhea. Bronchopneumonia is the most serious condition and is responsible for 60 of deaths caused by measles virus. CNS complications of measles are: Postmeasles encephalomyelitis Measles inclusion body encephalitis MIBE Subacute sclerosing panencepthalitis SSPE: It is a chronic degenerative complication of measles. Encephalitis is a degenerative complication and occurs approximately in one of every 1000 patients. Measles causes death mostly in children younger than 5 years. It develops within 2 weeks of onset of rash. It represents an autoimmunity response against the myelin basic protein. 