Chickenpox is caused by a virus, the varicella-zoster virus.
Chickenpox spreads from person to person by direct contact or through the air by coughing or sneezing. It is highly contagious. It can also be spread through direct contact with the fluid from a blister of a person infected with chickenpox, or from direct contact with a sore from a person with shingles.
Mumps is caused by a virus.
Mumps spreads from person to person through the air. It is less contagious than measles or chickenpox.
The incubation period of mumps is 14-18 days, but can range from 14-25 days.
Individuals with mumps usually first feel sick with such nonspecific symptoms as headache, loss of appetite, and low-grade fever.