Toronto Public Health is investigating what health officials say is now a community outbreak.

On Tuesday, the Toronto District School Board confirmed that two of its students were infected with the mumps virus, bringing the total of confirmed cases among students to three.

Despite the three cases found, one in each of three schools, Dr. Vinita Dubey, an associate medical officer with Toronto Public Health, said the virus has mainly affected 18- to 35-year-olds who frequented bars in part of the city’s west end. The affected area is west of Yonge St., east of Lansdowne Ave. and south of Bloor St. W.

Toronto normally averages about four cases of mumps per year. The largest mumps outbreak on record was in 2009, according to public health officials, when 33 cases were confirmed.

The highly contagious virus spreads through coughing, sneezing and coming into contact with a person’s saliva. Symptoms include swollen saliva glands, loss of appetite, tiredness and headaches.

Health officials are urging parents and children to check their immunization records and ensure they are up to date on their vaccinations. Two doses of the mumps vaccine are recommended for all individuals born in 1970 or later.