Top 5 western states for West Nile Virus activity

If you think the only threat mosquitoes pose are itchy bites, think again. These pests can spread serious diseases, including West Nile virus (WNV), a zoonotic infection that causes both mild and severe illness in human cases. They pick up the virus by feeding on infected birds, and can pass it to people through a single bite. Dead birds are often the first sign of local WNV infection and are a focus of public health surveillance programs.

Residents of the western U.S. should take the proper precautions to avoid West Nile Virus and reach out to your local Wester Exterminator as soon as you see signs of an infestation. Below we rank the states that we service for West Nile Virus activity based on 2023 data from the Centers for Disease Control and Prevention.

Where are you most likely to get the West Nile virus?

You’re most likely to get West Nile virus in areas where infected mosquitoes are active, especially during warmer months. This includes places with standing water, overgrown vegetation, and humid conditions. Risk is higher in regions that report regular mosquito activity, and reducing exposure to mosquito bites and treating outdoor areas can help lower your chances.

Have you seen an increase of mosquitoes around your home or business? Get in touch with the mosquito control experts at Western by calling 800-937-8398 or contacting us online.

What states have the most cases of West Nile virus in the US?

Some states report more West Nile virus cases than others, mostly due to climate, mosquito activity, and population density. Warmer regions with longer mosquito seasons tend to see higher numbers. Below we rank the states that we service for West Nile Virus activity (WNV cases) based on 2023 outbreak data from the Centers for Disease Control and Prevention.

5. Utah

Utah starts off our list with eight total cases of West Nile Virus in 2023. Several bird species that are known to carry West Nile Virus are found in the Beehive State, such as the American robin and bald eagle. Melting snow can result in standing water, a condition conducive to mosquito breeding and survival. If you live in areas like Salt Lake City, you’ll want to watch out for mosquito activity on your property and take action at the first sign of an infestation.

4. Oregon

The Beaver State comes in at number four, with 17 cases of West Nile Virus in 2023. Oregon sees most of its mosquito activity near water sources such as the Columbia River, Bonneville Dam, and Willamette Valley. Like Utah, melting snow provides mosquitoes with optimal breeding grounds. Cities like Portland and Roseburg with large populations may experience higher levels of West Nile Virus.

3. Idaho

Idaho comes in at number three on our list, with 36 West Nile Virus reported in 2023. The gem state is home to many bird species susceptible to West Nile Virus, such as the American crow and common raven. Melting snow in parts of Idaho leaves behind stagnant water, providing good conditions for mosquitoes. If you reside in cities like Boise or Twin Falls, stay alert for mosquitoes and try to eliminate any sources of standing water at your home or business.

2. Arizona 

Mosquitoes breed year-round in Arizona, with a total of 82 cases of West Nile Virus in 2023. Popular cities in Arizona, such as Phoenix, can see more mosquito activity than most, making it essential to protect yourself from mosquito-borne diseases. In the Copper State, dry conditions lead to frequent lawn and crop watering. The water from this can create puddles, the perfect place for mosquitoes to breed. And, of course, monsoon season hits Arizona in the summer months, which leads to more standing water and larger quantities of mosquitoes, increasing the chance of West Nile virus infection.

1. California

The highest number of West Nile virus cases can be found in the Golden State of California. In 2023, California reported 409 total cases of West Nile Virus. California has a high population, providing plenty of opportunities for a blood meal. Standing water that pools in low areas after spring rains and any abandoned water containers on your property both give mosquitoes a greater opportunity to breed. Whether you live in Los Angeles, Sacramento, or another California city, it’s key to get ahead of mosquito issues to prevent further problems.

West Nile Virus symptoms

In most cases, people who have West Nile virus do not actually experience symptoms. Some may deal with a fever and symptoms like headaches, joint pain, and rash. These signs may last a few days or stretch out over a few weeks, depending on the person’s health. While many recover fully, some people may continue to feel tired and weak long after the virus has cleared.  If you think you may have West Nile Virus, contact a medical professional as soon as possible.

What populations are most at risk for West Nile virus?

While anyone can get infected, people over 60 years old or who have weakened immune systems are at a higher risk of contracting the virus. This includes individuals with cancer, kidney disease, or diabetes. According to the CDC, around one out of 150 people infected with the virus are likely to develop a secondary illness that affects the central nervous system, such as meningitis.

West Nile Virus prevention

Follow these proactive steps to lower your risk of mosquito bites:

• Fix holes in screens on doors and windows
• Eliminate standing water, such as in flowerpots and rain gutters
• Wear long-sleeved shirts when outdoors during high mosquito activity
• Avoid being outside during dusk and dawn
• Use an EPA-registered mosquito repellent when outdoors

How to get rid of mosquitoes

If you have a mosquito infestation, contact your local Western Exterminator office to help eliminate the mosquitoes before they get worse. Our technicians know how to get rid of mosquitoes and can provide an effective treatment solution. Your technician will also give recommendations on how to get rid of standing water at your property. Contact us today to learn more about our mosquito control services and take the necessary precautions to protect your family.