A study of mumps in Alberta, Canada, confirmed the benign outcome in most cases, but indicated the potential of mumps vaccination for reducing hospital admissions for aseptic meningitis. Generally a mild infectious disease. Complications, such as neurological disorders and thrombocytopenia, may occur but are rare. A history of rubella should therefore not be accepted without serological evidence of previous infection. The incubation period is 14-21 days, and the period of infectivity is from 1 week before until 4 days after the onset of the rash.
Infection is spread by respiratory droplets.
Some infected infants may appear normal at birth, but defects, especially sensorineural deafness, may be detected later. In 1992 and 1993, rubella epidemics were reported in those States where rubella was notifiable. Outbreaks usually occur in spring and early summer. Must be stored in the dry state at 2-8deg. C or colder and protected from light.