West Nile Virus - Statistics and Incidence Rate

West Nile virus is most commonly spread from the bite of a mosquito infected with the virus. Uncommonly, individuals who receive infected blood through transfusion and organs/tissues through transplantation can become infected as well.

While the virus can cause severe disease, most infected individuals have no symptoms or mild symptoms. West Nile virus has numerous signs and symptoms including fever, body aches, rash, inflammation of the brain, vomiting, and muscle weakness.

West Nile Virus in Niagara

  • Less than five cases reported in 2015.
  • From 2010 to 2013, Niagara has had a higher incidence rate of West Nile Virus cases compared to the province. In 2014, Niagara was below the provincial incidence rate (Figure 1).

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

Probable and confirmed cases reported.
Sources: Integrated Public Health Information System [2006-2015], extracted March 31, 2016 by Niagara Region Public Health; Population Estimates, IntelliHealth, Ministry of Health and Long-Term Care [2015], extracted April 17, 2015 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 [April 20, 2015].

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