There are now 119 confirmed cases of measles in Quebec, a jump from 32 cases reported at the end of February, health officials said Wednesday.
A student from a Joliette elementary school in the Lanaudière region attended the school for one day while infectious, exposing staff and students to the virus.
There are 114 students and 51 staff members at the school who have been identified as not fully vaccinated.
Health officials said that parents and staff members have been notified of the exposure, and that vaccinations will be offered at the school Thursday morning.
Those who deny vaccination will be required to stay home for two weeks.
The level of contact that students had with the infected party varies, says Dr. Joane Désilets, adding that "immunization against measles… is the best protection against the disease and its complications."
There are no known cases of measles in Quebec outside of the Lanaudière community, located northeast of Montreal. Of the 119 measles cases, all were unvaccinated.
Measles is an infectious, airborne disease that is highly contagious. Symptoms include a blotchy, red rash, cough and fever, and begin seven to 14 days after a person is exposed.
The measles vaccination is administered to infants in Quebec at 12 and 18 months, as part of the province's immunization schedule.
All 119 cases are connected to a measles outbreak in California's Disneyland, which began in December 2014, according to the California Department of Public Health.