A fourth person in the Montreal region has been diagnosed with measles and a restaurant on Décarie Boulevard has been added to the list of locations where people could have contracted the disease, Quebec's health ministry said Monday.

Pizza Pita, situated near Plamondon Avenue, is now on a list that includes pharmacies, coffee shops, buses and stores where someone infected with measles spent time.

In total, three people in Laval were infected after coming into contact with the first victim, who contracted the disease during a trip out of the country at the end of June.

All but one of the 11 at-risk locations currently on the list are in Laval.

Pharmacie Proxim, 5020, boulevard des Laurentides, Laval, June 29, 10:30 a.m. to 11:45 a.m.

Pharmacie Daniel Pilon, 1110, boulevard Vanier, Laval, June 29, 9 a.m. to 11:15 a.m

Corridor and common areas near entrance 2 at CF Carrefour Laval, June 26, 4 p.m. to 9:30 p.m.

Second Cup café near entrance 2 at CF Carrefour Laval, June 26, 4 p.m. to 9:30 p.m.

Dollorama, 2077, boulevard des Laurentides, Laval, June 26, 4:50 p.m. to 6:20 p.m.

Pizza Pita Décarie 6415, boulevard Décarie, Montréal, June 26, 4 p.m. to 6 p.m.

STL 70 bus, which left Cartier metro station at 3:18 p.m. in the direction of Montmorency metro station, June 26, 3:30 p.m. to 5 p.m.

Laval Excellence gymnastics club, 1555, boulevard Martin Est, Laval, June 26, 12 p.m. to 4:30 p.m.

STL 20 bus, which left Cartier metro station at 12:22 p.m. in the direction of the Notre-Dame/Montgolfier terminus (Chomedey), then left the Notre-Dame/Montgolfier terminus at 12:55 p.m. in the direction of Cartier metro station, Laval,June 26, 12:15 p.m. to 1 p.m.

STL 70 bus (same vehicle as the previous 20 bus), which left Montmorency metro station at 11:07 a.m. in the direction of Cartier metro station, Laval, June 26, 11:30 a.m. to 12:15 p.m.

Restaurant L'Œufrier, 1702, boulevard des Laurentides, Laval, June 26, 7 a.m. to 8:40 a.m.

Exposure periods are determined based on the time a contagious person spent at the location, with an extra hour added to take into account any virus that stays in the air.

You can also consult the updated list of locations on the public health website.

Symptoms include fever, redness

The main symptoms of this highly contagious disease are severe fever, followed by redness on the body.

Babies under one year of age, people with weakened immune systems and pregnant women who are not adequately vaccinated are most at risk of complications.

Over the last couple months, Montreal public health has been working with several clinics and hospitals to prevent a possible measles outbreak.

People are being told to call Info-Santé by dialling 811 with health concerns, and, if necessary, they will be referred to the nearest place where they can go for evaluation and treatment.

The measles vaccine is the most effective way to avoid contracting measles, officials say, but anti-vaccination movements have contributed to outbreaks of the disease.