West Nile virus (WNV) is a mosquito-borne virus that can be transmitted to humans. Most people who become infected experience no immediate symptoms or have very mild illness (fever, headaches, body aches). However, the virus can result in serious neurological illness such as encephalitis (inflamation of the brain) which can pose long-term complications and even cause death.

There is no cure for West Nile virus. There is no vaccine against catching it.

West Nile virus is transmitted to people through the bite from an infected mosquitoes. There are many species of mosquitoes, most of which are only nuisance mosquitoes. The main carriers of WNV in Saskatchewan are Culex tarsalis mosquitoes which are most active during July, August and early September.

The risk of West Nile virus varies from year to year, depending on the mosquito population. The risk is higher if you are active and spend lots of time outside on the farm, at the cottage, camping, hiking, gardening or golfing. Early mornings and late evenings are periods of greatest mosquito activity. The elderly and those with certain medical conditions are at higher risk of developing the severe form of WNV. If you are exposed to infected mosquitoes, you are at risk. Whenever you're outside, take preventative measures.

Pregnant women are not at increased risk of getting West Nile virus.

Insect repellents such as DEET can be used by pregnant women, but you may feel more comfortable with other measures, such as protective clothing and avoiding times and places where mosquitoes are most active. There are no reported adverse effects from the use of repellents containing DEET in pregnant or breastfeeding women.

Pregnant women with symptoms of infection should see a health professional.

Once you have had a West Nile Virus infection, you are likely to have immunity for a number of years.

Because 80% of people who contract the virus do not experience symptoms, it's not easy to know whether you have developed an immunity.

Any immunity you may have will wane in later years. Therefore, it is recommended you continue to take preventative measures, even if you have been infected in the past.