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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.
The symptoms of mumps normally appear 2-3 weeks after the patient has been infected, however almost 20% of people with the virus do not suffer any signs or symptoms at all. The main symptom of mumps is painful and swollen parotid (salivary) glands, which cause the person's cheeks to puff out.umps is an extremely contagious viral infection that usually affects children. The condition has a number of symptoms, the most common one being swelling of one or both of the salivary glands on the sides of the face.