According to the Department of Public Health and Environment, the Mead resident became ill on July 27 and was hospitalized the next day.
West Nile virus, spread by the bite of an infected mosquito, can affect a person's nervous system.
Last year, Toronto Public Health did not record the first lab-confirmed case of West Nile virus until August 25.
Vaccines are not yet available for use in humans to tackle the mosquito-borne virus. "It's extremely important to avoid getting bit by mosquitoes".
The vector index, which measures human risk for infection, remains lows in Weld County, but health officials say that could change in the coming weeks.
Most people infected with the virus do not show symptoms, although more severe symptoms may occur, including fever, headaches, body aches, fatigue, nausea, vomiting, and sometimes swollen lymph glands or a skin rash.
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"If there is a four-fold increase in the antibody count in the second sample, only then can we say it is a West Nile infection".
Most infected people don't exhibit any symptoms but if you do you should see a healthcare professional immediately. Do not forget to drain water from tires, cans, flowerpots, clogged rain gutters, rain barrels, toys and puddles.
"Until the hard frosts of fall set in, Halton residents should continue to protect themselves against mosquito bites and remove mosquito breeding sites", said Dr. Daniela Kempkens, Halton Region Acting Medical Officer of Health.
Dusk and dawn is when mosquito activity is highest.
DEET is an effective ingredient to look for in insect repellents. Long sleeves and trousers if possible.