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West Nile virus continues to loom even as temperatures drop

Collegian | unknown
Mosquito transmitting a vector-borne disease.

As the end of summer approaches and fewer bugs are visible, remain vigilant, and keep the bug spray close by, as the risk of West Nile virus still looms.

First appearing in Colorado in 2002, the West Nile virus has had many cases over the years, with this year having a spike in cases.


Kori Wilford, communications and technology manager for the Larimer County Department of Health and Environment, said that as of Tuesday, there are 53 reported cases and 16 hospitalizations in Larimer County, with a majority being from Fort Collins.

Even as temperatures drop, the Larimer County Health Department is still prepared to see cases rise over the next month.

“We do continue to see cases through October because if someone got infected in August when the mosquitoes were really prevalent, it might take a few weeks before they start seeing symptoms or before they get tested,” Wilford said.

Symptoms of West Nile virus vary, though the main symptoms one can expect would be a headache, fever, stiffness in the neck and disorientation. These symptoms can signify an early infection of meningitis or encephalitis, both of which should be met with immediate medical attention.

“Most people don’t actually have symptoms,” Wilford said. “About 80% don’t show any symptoms at all, (and) another percentage has real mild symptoms — they might have a headache (or) some fatigue, but otherwise they can recover at home. About 1% of people who get West Nile virus have what we call Neuroinvasive West Nile Disease, and that is something that can be more serious where people are having neurological symptoms (and) really severe headaches — they might need to be hospitalized.”

The West Nile virus has no cure. Most of the treatment given to someone who is hospitalized includes making them more comfortable with fluids, painkillers and overall supportive care.

When it comes to preventative care, Wilford mentions the four D’s of preventing mosquitoes: dusk/dawn, dress, drain and DEET spray.

“We always talk about the four D’s — that stands for dusk and dawn, meaning that’s when the mosquitos are most active,” Wilford said. “So we recommend avoiding being outside during dusk and dawn or using a good repellent. We recommend DEET, which is another one of the four D’s. Wearing long sleeves … is another D, and then (the fourth D is) drain. We really encourage folks to drain any standing water around their house.”

This is a zoonotic disease, which is contracted by vectors who carry the disease and spread it. The vectors are culex mosquitoes who spend a lot of time around the water.


“The type of mosquito that transmits West Nile virus are culex mosquitoes, and those particular mosquitoes really love to breed just in shallow, warm water,” Wilford said. “So even a wheelbarrow or a flowerpot that has been sitting outside can be a pretty significant breeding ground for those culex mosquitoes.”

Keep an eye out for mosquitoes as summer comes to a close, and begin to prepare for next year. Spread the word to family and friends about how to prevent water buildup and keep mosquitoes away from you. As with many diseases, those who are immunocompromised are more at risk.

“We always appreciate people letting their friends and family know,” Wilford said. “West Nile can impact anyone, but we see folks who get the sickest usually over 60, and so younger people can let their parents know (and) their neighbors know.”

Reach Ayla Sanchez at or on Twitter @CSUCollegian.

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About the Contributor
Ayla “AJ” Sanchez is an editor for the news desk at The Collegian starting the fall semester of 2023. She hopes to bring accurate and positive news to The Collegian and get coverage on the things that matter to Colorado State University and Fort Collins as a whole. Sanchez is new to CSU and The Collegian, having no experience in news writing before joining. A transfer from the Community College of Denver, Sanchez hopes to learn more about university life and the traditions surrounding CSU. Her goal is to thrive in this new environment and make a new start for herself. Sanchez is a double major in journalism and political science with a minor in history. Her goal is to become a representative of Colorado to bring change within the state and the country as a whole. She hopes to gain experience while at CSU that will help her reach her goal. Outside of work and school, Sanchez loves to hike, visit various bodies of water — City Park’s lake being her favorite — and walk to 7-Eleven for a nice cold Slurpee. She's excited for the winter since building snowmen and snowball fights are her favorite activities. Sanchez is excited for the kick-off of the new school year and to be one of this year's news editors.

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