Communicable 2 days before to 5 days after onset of swelling.
Incubation period is 12-25 days after exposure.
Mumps exposure: Droplet precautions should begin 10 days after first contact and continue through 26 days after last exposure.
Confirmed Mumps: Precautions are required until 5 days after onset of parotid swelling.
Mumps Exposure in susceptible patients: Droplet/contact precautions from 10 days after the first contact (exposure) through 26 days after last exposure to index case.
For information regarding diagnosis, please see the following resources: