A makeshift clinic has been set up at a west-end daycare after health officials discovered an adult infected with the measles virus visited the facility.

Toronto Public Health warned parents that children who attended the West End YMCA daycare may be at risk of contracting the virus, according to parents at the daycare Monday morning.

Parents said that TPH recently learned that an adult who has the measles visited the facility located at 931 College St., just west of Ossington Avenue, during the last month.

The adult with the virus is one of six people who are known to be infected in Toronto. Four of the patients are adults and two are children. TPH says it is still investigating whether there are any connections among the cases in Toronto.

Children are usually given a first dose of the measles-mumps-rubella vaccine at 12 months, and a second dose between the ages of 4 and 6. Some of the younger children at the daycare may not be fully vaccinated. The parents of those children were urged to speed up the vaccination process.

"It's not like it's harmful to get the vaccine earlier, and because they have been exposed to case of measles, it's important to ensure that they are protected," said Dr. Vinita Dubey, an associate medical officer of health with TPH.

A statement issued by the YMCA of Greater Toronto said that there were currently no confirmed case of measles in its facilities.

On Friday, Toronto District and Toronto Catholic District school boards sent letters home with students and emailed notes to parents that provided more information on the virus and vaccinations.

The letter told parents that if there is a measles exposure at a Toronto school, those without vaccinations will not be allowed to attend the school until the outbreak is over.

TPH spokesperson Lenore Bromley told CTV Toronto in a statement that representatives follow up with individuals who have been exposed in schools and daycare centres.

Bromley said that people in those settings are "more likely to not be fully immunized and are at a higher risk of developing severe illness," because of their young age.

"We know that measles is circulating in Toronto and that is why we are encouraging everyone to check their vaccine records and make sure individuals and their families are up to date."