Health Unit Concludes Legionnaires’ Disease Investigation

Source Of Bacteria Has Not Been Found

An investigation into an increase in Legionnaires’ disease cases in Barrie has concluded.

The Simcoe Muskoka District Health Unit (SMDHU) announced the investigation on December 11th, 2019 after five cases of the disease were reported.

The health unit says it has been more than a month since the onset of the last case, and none of the cooling towers within a wide radius of the cases were found to be the source of infection. As a result the investigation into the increase in Legionnaires’ disease has ended

The SMDHU says ” despite an intensive investigation, they have been unable to determine the source or sources of the bacteria. This is not unusual in Legionnaires’ disease investigations, in which finding a common environmental source of the bacteria is known to be difficult and complicated.”

Related:Five Cases Of Legionnaires’ Disease In Barrie


People can develop Legionnaires’ disease when they inhale aerosolized water droplets containing the bacteria. People cannot get Legionnaires’ disease by drinking water and it cannot be passed from person to person. Most people exposed to the bacteria do not become ill.

Those at increased risk of the disease are people over the age of 50, smokers, or those with certain medical conditions, including weakened immune systems, chronic lung disease or other chronic health conditions.

For more, see www.smdhu.org or call Health Connection at 705-721-7520 or 1-877-721-7520, weekdays from 8:30 a.m. to 4:30 p.m.