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The period between becoming infected and the start of plague symptoms is called the plague incubation period. The bubonic plague incubation period is typically two to six days. The primary pneumonic plague incubation period is usually one to three days.
An incubation period is the period of time between when a person is first infected and when symptoms appear. When a person becomes infected with norovirus, the virus begins to multiply within the small intestine. After approximately 1 to 2 days, norovirus symptoms can appear.