When a person inhales the virus, it takes between 10 and 21 days for her to develop the disease. This is the incubation period.
While this represents the complete range, the average incubation period is 14 to 16 days. The first sign of the disease when the virus becomes active might not be the rash. In some people, swollen glands and flu-like symptoms are precursors to the red spots.
To learn more you should go to a medical professional.
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