An illness with acute onset of unilateral or bilateral tender, self-limited swelling of the paraotid or other salivary gland, lasting greater than or equal to 2 days, and without other apparent cause
Probable: a case that meets the clinical case definition, has noncontributory or no serologic or virologic testing, and is not epidemiologically linked to a confirmed or probable case.
Confirmed: a case that is laboratory confirmed or that meets the clinical case definition and is epidemiologically linked to a confirmed or probable case. A laboratory-confirmed case does not need to meet the clinical case definition.