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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.
1 FACT: Mumps is most contagious from one to two days before to five days after the onset of infection in the salivary glands (parotitis). 2  FACT: About two to three out of every 10 adolescent or adult men who have mumps may experience painful swelling of the testicles.ymptoms usually appear between 12 and 25 days after a person has been exposed to the mumps virus. As many as 30 to 40 percent of infected people will not have symptoms and nearly 50 percent will have non-specific or mostly respiratory symptoms, with or without infection in the salivary glands.