Toronto doctors urge vaccination amid spread of 'killer' disease

The city's public health unit and doctors are urging people to get vaccinated against a potentially fatal bacterial disease amid a rise in cases. 

Toronto Public Health (TPH) has reported 14 confirmed cases of invasive meningococcal disease (IMD) so far this year, more than double the previous average of six cases per year. 

"This is a substantial increase and we're not even halfway through the year already," Toronto's associate medical officer of health Dr. Vinita Dubey said in an interview.

She also noted that a strain of the disease called W-135, which is not usually common in Canada, has already proven deadly.

"We've had one child and one adult who have died. These are very tragic deaths," Dubey said.

IMD is a rare but life-threatening bacterial infection that can infect the brain and spinal cord, causing meningitis, and the bloodstream, causing septicemia. Teens and infants are most likely to become infected and up to 10 per cent of all patients with IMD die, according to Health Canada.

Dubey said all five strains of IMD — A, B, C, Y and W-135 — tend to spread in Canada, but the W-135 variant in particular has hospitalized everyone who has had it recently in Toronto. 

"The strain is called a hypervirulent strain, meaning that it can make you very sick," she said. "It comes on quickly and it progresses quickly."

The W-135 strain usually makes up 20 per cent of all cases in Toronto, but that's increased to half this year, according to TPH.

Dr. Allison McGeer, an infectious diseases specialist at Toronto's Mount Sinai Hospital, said the W-135 variant is commonly found in Saudi Arabia, which causes concern among health providers before and after the Hajj pilgrimage every year.

"The Hajj has so many people grouped together and meningococcal vaccines have been relatively expensive, and so they're out of reach of many countries in the world," McGeer said.

TPH is encouraging people returning from Saudi Arabia to watch for IMD symptoms, such as fever and headache, and to avoid sharing food and drinks as a precaution. Dubey said someone may carry the bacteria for weeks or months before it causes severe disease.

Ontario residents aged 18 to 38, including newcomers, who have not received IWD vaccines when they were in school, are eligible for a publicly funded meningococcal vaccine that protects against most strains of the disease. 

Toronto-based family physician Dr. Vivien Brown, who also sits on the board of Immunize Canada, said the vaccine that protects against meningococcal B is not publicly funded.