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Mumps is an acute illness caused by the mumps virus that is spread primarily by respiratory droplets (droplet spread) produced when an infected person coughs or sneezes. Mumps is most easily spread 48 hours before the symptoms begin. Most adults born before 1957 have been infected naturally and are probably immune. Immunization is the best way to prevent mumps. Mumps protection is provided in the combination MMR vaccine together with measles and rubella.

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