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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.he mumps vaccine is the general method for preventing mumps; it can come on its own or as part of the MMR vaccine. The MMR vaccine also defends the body from rubella and measles. The MMR vaccine is given to an infant when they are just over one year old and again as a booster just before they start school.