Chlamydia - Statistics and Incidence Rate

Chlamydia is the most common sexually transmitted infection in Canada. It is caused by bacteria that are transmitted through unprotected oral, vaginal or anal sex. It can also be passed on from mother-to-child during childbirth.

Although there are signs and symptoms for chlamydia, some people will not have any of them. You can still pass on the infection if you don't have any signs or symptoms. Symptoms differ in males and females.

Chlamydia in Niagara

  • A significantly higher number of Chlamydia cases were reported in February and March of 2016 compared to the historical three year average(Figure 1)
  • 972 cases of Chlamydia have been reported up to the end of September 2016.
  • From 2006 to 2013 the incidence rate of Chlamydia has continued to rise in both Niagara and Ontario (Figure 2)
  • While on the rise, Niagara has consistently been below the provincial incidence rate for Chlamydia (Figure 2)

Figure 1. Number of confirmed Chlamydia cases in the Niagara region by month, compared to historical 3 year average and 95% confidence interval (2013-2015)

*Confirmed cases reported Sources: Integrated Public Health Information System [2010-2015], extracted October 25, 2016 by Niagara Region Public Health.

Figure 2. Incidence rate of Chlamydia by year, for Niagara region and Ontario

Sources: Integrated Public Health Information System [2006-2013], extracted July 17, 2015; Population Estimates, IntelliHealth, Ministry of Health and Long-Term Care [2015], extracted April 17, 2015.

Ontario data: Ontario Ministry of Health and Long-Term Care, Integrated Public Health System database, extracted by Public Health Ontario [April 20, 2015].


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