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.
Precautions are required until 5 days after onset of swelling.
For information regarding diagnosis, please see the following resources:
Public Health Ontario Mumps Website
OAHPP Diagnostic Test Recommendations