Distribution and Incidence

Serologic surveys as well as recorded outbreaks have demonstrated the existence of mumps throughout the world. Mumps is not a reportable disease in most countries, is underreported even in countries where it is a notifiable disease, and may be clinically inapparent in 30 to 40 percent of infections. In populated areas where mumps is both endemic and epidemic, over 80 percent of the adult population will show serologic evidence of prior infection. In remote or island populations where mumps is not endemic, a significant proportion of the population can be susceptible which may lead to large outbreaks when the mumps virus is introduced from the outside.

In some countries, such as the United States, where mumps is a reportable disease and mumps vaccine has been extensively used (often in combination with measles and rubella vaccine), there have been impressive declines in reported cases of mumps.

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