Giardiasis - Statistics and Incidence Rate

Giardiasis is an infection that is caused by a parasite. It is usually found in areas that do not have good sanitation, including institutions and day care centres. Children under 5 and parents of these children are at the highest risk of infection.

Signs and symptoms of infection will differ depending on how long the infection is in the body. The infection can be passed on from hand to mouth during the entire time an individual is infected.

Giardiasis in Niagara

  • The number of Giardiasis cases reported has been similar to the 5 year monthly average up to the end of September 2016 (Figure 1).
  • 18 cases of Giardiasis have been reported up to the end of September 2016.
  • From 2008 to 2011 Niagara was below the provincial incidence rate for Giardiasis. In 2012 & 2013, local outbreaks pushed Niagara above the provincial incidence rate (Figure 4). In 2014, Niagara‚Äôs incidence rate was slightly below the provincial incidence rate. (Figure 2)..

Figure 1. Number of confirmed Giardiasis cases in the Niagara region by month, compared to the historical 5 year average and 95% confidence interval (2011-2016).

Probable and confirmed cases reported. Sources: Integrated Public Health Information System [2010-2016], extracted October 25, 2016 by Niagara Region Public Health.

Figure 2. Incidence rate of Giardiasis 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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