Find out the facts on the West Nile virus and things you can do to protect yourself and your family this summer. West Nile Virus is only one of many diseases around the world that are spread by mosquitoes. Most people infected with West Nile virus show mild flu-like symptoms or no symptoms at all.

In the summer of 2007, the Prairie Diagnostic Services (PDS) laboratory in Saskatoon had a substantial increase in the number of confirmed cases of West Nile virus (WNV) disease. For the 4 western provinces and Ontario, the number of tests for the presence of WNV increased from 107 in 2005 and 88 in 2006 to 132 in 2007 by August 28. Author information: (1)Centre for Biotechnology, Brock University, St. Catharines, Ontario, Canada. Horses can also be early indicators of West Nile virus in a region. The first human case of West Nile virus infection in Canada was reported in Ontario in 2002. In the 1990s, outbreaks of West Nile virus encephalitis were reported in Algeria, the Czech Republic, France, Romania, Russia, and Israel. Public Health Agency of Canada (PHAC): West Nile virus surveillance data for Canada external icon; CDC Disease Maps. West Nile virus in Ontario, Canada: a twelve-year analysis of human case prevalence, mosquito surveillance, and climate data. 10.1371/journal.pone.0183568 [ PMC free article ] [ PubMed ] [ CrossRef ] [ Google Scholar ]

The true number of West Nile virus infections in Canada is likely greater.Mosquito surveillance depends on the level of anticipated or current West Nile virus activity in a particular area.In areas where West Nile virus has not been found, surveillance of mosquitoes focuses on:In areas where West Nile virus has already been found, mosquitoes may still be tested for West Nile virus. About 80% of those who contract the virus may not show symptoms at all. The risk of becoming infected with the West Nile virus is greatest during mosquito season. By 2003, West Nile virus had spread to 7 Canadian provinces: Nova Scotia, New Brunswick, Quebec, Ontario, Manitoba, Saskatchewan, and Alberta. 10 deaths were linked to West Nile virus, and more than 1300 Canadians became ill after being infected. West Nile Virus and Other Domestic Nationally Notifiable Arboviral Diseases – United States, 2018. MMWR reports . Exposure to WNV can be prevented by reducing mosquito development sites (i.e., standing water) and using personal protection against mosquitoes.

Learn about West Nile virus, its causes, symptoms, risks, treatment, prevention and surveillance. Scientists do not know why some people recover quickly while others face long-term health problems. Worried about being exposed to the West Nile virus?

"West Nile virus is an infection spread primarily by the northern house mosquito that, in a small number of cases, can cause serious illness," OPH …

Less than 1% of those infected with the virus develop severe illness, but for some, especially those who are ill or have a weak immune system, it can result in neurological (brain and nerve) effects, paralysis, or death.

West Nile virus in Ontario, Canada: A twelve-year analysis of human case prevalence, mosquito surveillance, and climate data Bryan V. Giordano1,2, Sukhdeep Kaur3, Fiona F. Hunter1,2,3,4* 1 Centre for Biotechnology, Brock University, St. Catharines, Ontario, Canada, 2 Centre for Vector-Borne West Nile Virus (WNV) first arrived in Ontario, Canada in 2001 and has since spread throughout most of the province, causing disease in humans. How many human cases of West Nile virus are reported annually?

It is characterized by fever, headache, muscle aches, nausea, vomiting, and sometimes swollen lymph glands or a skin rash on the chest, stomach, and back. Provincial, national, and local authorities will keep track of the virus as it appears in birds, horses, mosquitoes, and humans. In 2013, there were 115 reported clinical cases. Figure 6. Local veterinarians should be contacted for guidance on appropriate vaccination products and strategies.All veterinary laboratories in Canada are required to In First Nations communities, First Nations and Inuit Health regional staff advise:They are advised on emerging needs for West Nile virus public health control measures.To get information about specific West Nile activity in their community, First Nations residents can contact their:This includes information on surveillance activities and case counts. 10 deaths were linked to West Nile virus, and more than 1300 Canadians became ill after being infected. In 2004, there were no deaths linked to West Nile virus in Canada, with 25 human clinical cases. One view is that the virus had a spell of "good luck" - strong genes, bird hosts with no natural defenses against a foreign invader, and the favourable environmental conditions of the long and dry summers.How it spreads so efficiently to humans is also still unclear. West Nile Virus (WNV) is transmitted through the bite of an infected mosquito. (See "Mosquitoes spreading disease" for tips. That year, 426 Canadians became ill after being infected with the virus. Among those 25, there were 6 confirmed cases of West Nile fever and 9 confirmed cases of West Nile virus neurological syndromes.

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