Incubation period is defined as the time from being infected to the appearance of symptoms. After becoming infected with the variola virus (the virus that causes smallpox), the virus begins to multiply within the body and the symptoms develop once enough viruses are present.
The incubation period of smallpox is about 12 to 14 days, but the symptoms can begin as early as 7 days or as late as 17 days after infection with the virus.
The expected duration of smallpox lasts about five weeks. This includes;
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