Legionella is a bacterium that lives in water and can cause Legionnaires' disease or Pontiac fever in humans. Pontiac fever causes flu-like symptoms and most people recover quickly. Legionnaire's disease is more severe and can cause flu-like symptoms, but also pneumonia. Treatment is with antibiotics.

Legionellosis in Niagara

  • Six cases of Legionellosis were reported up to the end of September 2016.
  • From 2012 to 2013, the incidence rate for Legionellosis seemed to be on the rise for both Niagara and Ontario. In 2014, both Niagara and Ontario saw a decline, with Niagara above the province. (Figure 1).

Figure 1. Incidence rate of Legionellosis by year, for Niagara region and Ontario (2006-2014).

Probable and confirmed cases reported.
Sources: Integrated Public Health Information System [2006-2015], extracted October 25, 2016 by Niagara Region Public Health; Population Estimates, IntelliHealth, Ministry of Health and Long-Term Care [2016], extracted September 29, 2016 by Niagara Region Public Health.
Ontario data: Ontario Ministry of Health and Long-Term Care, Integrated Public Health System database, extracted by Public Health Ontario [October 25, 2016].

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