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Mumps is spread from person to person by droplets sprayed from the respiratory tract of infected persons, and it is highly contagious. The incubation period of the disease varies from 15 to 21 days.
In some cases, the incubation period can be as short as 12 days or as long as 25 days. A person is not contagious during the early mumps incubation period. A person is most contagious about three days prior to the onset of the swelling of the salivary glands (called parotitis) to nine days after the onset of symptoms.