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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.
Symptoms of mumps. The symptoms of mumps usually develop 14 to 25 days after becoming infected with the mumps virus (this delay is known as the incubation period). The average incubation period is around 17 days. Swelling of the parotid glands is the most common symptom of mumps.The parotid glands are a pair of glands responsible for producing saliva.They're located in either side of your face, just below your ears.he average incubation period is around 17 days. Swelling of the parotid glands is the most common symptom of mumps. The parotid glands are a pair of glands responsible for producing saliva. They're located in either side of your face, just below your ears.