West Nile Virus 2026: Early Season Detected in Texas, Louisiana & California | Virus Watcher
10 Active OutbreaksWest Nile Virus is showing early 2026 season activity across multiple states before the typical transmission season begins. Positive mosquito pools have been confirmed in Texas (San Antonio, Frisco), Louisiana (New Orleans), and six California counties. Human cases have already been confirmed in Colorado. Peak transmission season runs July through September — and an above-average season is projected for 2026. Most infections are mild or asymptomatic, but about 1 in 150 infected people develop severe, potentially fatal brain inflammation.
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What is West Nile Virus?
West Nile Virus arrived in the U.S. in 1999 and has since become the leading mosquito-borne disease in the country. It's transmitted by Culex mosquitoes that bite infected birds. While 80% of infected people have no symptoms, severe cases can cause encephalitis or meningitis with long-term neurological effects. Age over 60 significantly increases risk of severe disease.
Symptoms
- Mild (West Nile fever): Fever, headache, body aches, joint pain, vomiting, diarrhea, rash
- Severe: High fever, severe headache, stiff neck, disorientation, tremors, seizures
- Neurological: Muscle weakness, vision loss, paralysis, coma
- Long-term effects: Fatigue, memory problems, muscle weakness (can persist months/years)
Transmission
Transmitted through bites of infected Culex mosquitoes. Rarely through blood transfusion, organ transplant, mother to fetus, or breastfeeding. NOT spread person-to-person through casual contact.
Contagious Period: Not contagious person-to-person; can be in blood of infected person during illness
Prevention
- Use EPA-registered insect repellents (DEET, picaridin, IR3535, oil of lemon eucalyptus)
- Wear long sleeves and pants at dawn/dusk when mosquitoes most active
- Install/repair window and door screens
- Use air conditioning when possible
- Eliminate standing water (buckets, flower pots, bird baths, gutters)
- Change water in pet bowls, birdbaths weekly
- Treat or drain swimming pools, fountains
- Community mosquito control programs (spraying, larvicides)
- Avoid outdoor activities at dawn/dusk during peak season
Live West Nile Virus Global Case Map
6 countries with reported activity. Updated from real-time surveillance data.
United States — State Detail
1 state with reported activity. Click a state for detailed surveillance.
Active Outbreaks & Recent Cases
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Data sources: BEACON, ProMED, WHO, CDC, and 50+ national health agencies
✓ Live data updated in real-time from global health sources
Mosquito pool in Buda tests positive for West Nile Virus
AUSTIN (KXAN) -- A mosquito trap in Buda has tested positive for West Nile virus, according to the Hays County Development Services Mosquito Surveillance Program.
The positive sample was collected in the 78610 ZIP code and marks the fifth West Nile virus-positive mosquito pool identified in Hays County this year. County officials said no human cases of West Nile virus have been reported in Hays County so far.
Statewide, the Texas Department of State Health Services has reported 905 positive mos
📰 17 news sources reporting on this story.
Deadly virus found in holiday hotspots loved by Brits as 'red alert' issued
Mosquitoes carrying deadly West Nile virus have been detected in the Spanish regions of Fuengirola and Mijas - both of which are visited by thousands of Brits each year
Two popular Spanish holiday hotspots are on red alert after several people were struck down by the potentially deadly West Nile virus.
Mosquitoes which carry the disease have been detected in Fuengirola and Mijas, both visited by thousands of Brits every year. Health chiefs say the insects were found in traps installed in both m
📰 63 news sources reporting on this story.
West Nile Virus turns deadly in California as officials issue update
California has recorded its first West Nile virus death of 2026 after a Kings County resident died from the mosquito-borne illness, health officials announced Monday.
The death comes weeks after Kings County confirmed its first human case of the 2026 season, according to KGPW.
The infection was detected almost two weeks later than the county's first case in 2025.
"We are saddened to report that a Kings County resident has passed away due to West Nile Virus," Rose Mary Rahn, director of the Kin
📰 19 news sources reporting on this story.
New virus warning for Brits travelling to Europe 'no vaccine'
The World Health Organisation has issued a warning over a fast-growing outbreak
Brits heading to some of Europe's most popular sunshine hotspots this summer are being urged to take extra care, after health chiefs warned a fast-growing West Nile virus outbreak is spreading across the continent. The World Health Organisation (WHO) says recurring heatwaves are creating ideal conditions for infected mosquitoes to thrive, helping the virus reach new areas just as millions travel during the busiest ho
📰 23 news sources reporting on this story.
West Nile virus found in two mosquito traps in DeKalb County, health officials say
Dan Raby, the senior digital producer for CBS News Atlanta, has been covering everything happening around Georgia for more than a decade.
Mosquitoes found in two traps in DeKalb County have tested positive for the West Nile virus, officials say.
Officials with DeKalb Public Health say the positive traps were found in two different ZIP codes: 30088 in unincorporated DeKalb and Redan, and 30360 in Doraville.
There have been no reported human cases of infection in the county in 2026, the agency r
📰 84 news sources reporting on this story.
Los Angeles County reports first human West Nile virus case of 2026
Los Angeles County public health officials announced Monday the first confirmed human case of West Nile virus in the county this year, involving an Antelope Valley resident who was hospitalized after developing a severe neurological illness.
The patient began experiencing symptoms in late June and was diagnosed with West Nile virus encephalitis, according to the Los Angeles County Department of Public Health.
Los Angeles County Health Officer Dr. Muntu Davis urged residents to take precautions
📰 24 news sources reporting on this story.
Long Beach officials confirm first California case of human West Nile virus in 2026
Dean Fioresi is a web producer for CBS Los Angeles. He covers breaking news throughout Southern California. When he's not writing about local events, he enjoys focusing on sports and entertainment.
Long Beach city officials have confirmed California's first human case of West Nile virus in 2026.
In a news release shared Friday, the Long Beach Department of Health and Human Services said that the person was hospitalized with "neuroinvasive illness" and has since been recovering at home.
"While
📰 17 news sources reporting on this story.
'Be prepared, but don't be scared': West Nile virus detected in Lake County mosquitoes
It's been quite the start to the summer season -- weeks of dangerous heat, hazardous air quality due to Canadian forest fires, a parasite causing "explosive diarrhea" sweeping Illinois and, in Lake County, the first detection of the West Nile virus.
But while the mosquito-borne virus can pose serious risks for people, especially those with pre-existing conditions, Michael Adam, director of environmental health at the Lake County Health Department, said some basic precautions can keep residents h
📰 38 news sources reporting on this story.
West Nile virus detected in mosquitoes trapped in Fulton County neighborhood, health board reports
Dan Raby, the senior digital producer for CBS News Atlanta, has been covering everything happening around Georgia for more than a decade.
A group of mosquitos caught in an area of Atlanta have tested positive for West Nile virus, the Fulton County Board of Health reports.
Authorities say the positive test result was reported in a mosquito trap in the Grant Park neighborhood of Atlanta.
"Mosquitoes can be dangerous if infected and may pose a serious health risk to people in our area. We want to
📰 20 news sources reporting on this story.
How Chicago Health Department is protecting against West Nile virus
The Chicago Department of Public Health is taking steps to prevent West Nile virus in the area.
Health officials said they are spraying a chemical used to control mosquitoes in outdoor residential and recreational areas, specifically in the Pullman and South Deering neighborhoods and near O'Hare Airport.
Spraying will take place from dusk on Wednesday and Thursday until around 1 a.m.
This is just one of the ways CDPH aims to control West Nile virus in the city.
The Health Department also lays
📰 24 news sources reporting on this story.
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Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-08-07
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