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What is the incubation period of smallpox, i.e., the time from exposure until the first symptoms occur?

April 26, 2017exposure incubation occur period smallpox symptoms time

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What is the incubation period of smallpox, i.e., the time from exposure until the first symptoms occur?

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7-17 days (the average is 10-12 days). Initially, there is a febrile prodrome with fever, headache, and backache. Rash starts ~ 3-4 days after the start of this febrile prodrome. Patients are NOT contagious until the rash appears.