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The Latest Breaking News from West Nile

West Nile Cases Climb to 143 Nationally as CDC Data Show the Season Entering Its Peak Weeks

CDC surveillance reports 143 West Nile cases nationally through Aug. 4, up from 113 a week earlier, as peak transmission weeks begin.

Medical Daily

Where have all the mosquitoes gone? Parts of the US are seeing a huge drop — and that has experts worried

Mosquito levels are down 50 percent across some western and Midwest states - but the West Nile virus caseload has hit a 22-year high

The Independent UK

North Dakota Confirms First Human West Nile Case as Five Counties Report Positive Mosquitoes

A Cass County resident was hospitalized with West Nile virus, North Dakota's first human case of 2026, with positive mosquitoes in five counties.

Medical Daily

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CDC Reports West Nile Caused Most U.S. Arboviral Disease in 2024 as Powassan Reached a Record High

A CDC surveillance report counted 1,955 arboviral cases in 2024. West Nile dominated, and tick-borne Powassan hit a record 60 cases.

Medical Daily

California Reports Its First West Nile Death of 2026 in Kings County as Statewide Surveillance Numbers Climb

Kings County confirmed California's first West Nile death of 2026. Statewide mosquito surveillance shows why human case counts understate the spread.

Medical Daily

Maryland Confirms Its First West Nile Case of 2026 but Will Not Say Which County the Patient Lives In

Maryland confirmed its first 2026 West Nile case in the Capital Region but withheld the county. Here is the local mosquito data that is public.

Medical Daily

Utah Mosquito Samples Testing Positive for West Nile Have Jumped From 39 to 296 in a Single Season

Utah has 296 West Nile-positive mosquito samples this season, up from 39 at the same point last year. What that number measures.

Medical Daily

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West Nile Virus Turns Up in Stratford Mosquitoes as Connecticut Enters Peak Human Case Months

West Nile virus was found in Stratford mosquitoes as Connecticut enters peak months for human cases. Here is what residents should do now.

Medical Daily

Santa Clara County Reports Its First Two West Nile Cases of 2026, but Officials Cannot Say Where the Patients Were Infected

Santa Clara County confirmed two West Nile cases, but both patients traveled during the incubation period, so local transmission is unconfirmed.

Medical Daily

West Nile Virus Turns Up in Bay Township Mosquitoes as Ohio Logs 62 Positive Samples

Ottawa County, Ohio, detected West Nile virus in mosquitoes in Bay Township. What a positive mosquito pool means and the prevention step people skip.

Medical Daily

Some Counties Cannot Afford to Track Mosquitoes, and the CDC Says Its Own Counts Are Incomplete

The CDC says West Nile underreporting is inherent, and Washington monitors mosquitoes in only a few counties due to a lack of resources.

Medical Daily

Tulare County Warns of Two Mosquito Viruses at Once After Confirming Its First West Nile Case

Medical Daily

California West Nile Cases Are Running at Double Last Year's Pace as Three Valley Counties Report First Infections

California has six confirmed West Nile cases, double last year's pace. Tulare, Kings and Fresno counties report their first human infections of 2026.

Medical Daily

Tarrant County's First West Nile Patient of the Year Has the Severe Neuroinvasive Form of the Illness

Tarrant County confirmed its first 2026 West Nile case, and it is the severe neuroinvasive form. What Fort Worth area families should watch for now.

Medical Daily

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Medical Daily

Three Central Valley Counties Confirm Their First West Nile Cases as Mosquito Samples Test Positive Statewide

Fresno, Kings and Tulare counties confirmed their first 2026 West Nile cases as California logged 670 positive mosquito samples.

Medical Daily

Fresno County Found Its First West Nile Case of 2026 in a Blood Bank, Not a Clinic

Fresno County's first 2026 West Nile case was found through blood donor screening, not a clinic visit. What that reveals about hidden transmission.

Medical Daily

National West Nile Surveillance Lags By Weeks, So Check Maricopa County Data Instead Of Federal Dashboards

CDC updates West Nile counts every one to two weeks and counts cases by residence, not exposure. Here is where to find better local data.

Medical Daily

New Mexico Confirms First Two West Nile Cases of 2026 in Bernalillo and Otero Counties

New Mexico confirms its first two West Nile cases of 2026. A Bernalillo County woman is hospitalized. Peak season runs August through September.

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Medical Daily

West Nile Virus Deaths Rise in Arizona as 2026 Season Tracks at 5 Times the Historical Baseline

The 2026 West Nile virus season has recorded four deaths in Arizona and 48 national cases by late June, nearly five times the historical average. Peak season is still ahead.

Euronews

West Nile virus: 21 cases in Greece as it spreads across Europe

Italy, Spain, Romania and North Macedonia also reported locally acquired cases of West Nile virus infection.

Medical Daily

Phoenix Leads the Nation in West Nile Virus Deaths as 2026 Season Becomes Worst in Over Two Decades

Maricopa County reports 29 West Nile cases and 4 deaths — the worst early-season start in over 20 years. CDC confirms 48 cases in 23 states. What Phoenix residents need to know now.

Medical Daily

West Nile Season Opens at a 22-Year High with 38 of 48 Cases Already Involving Brain Disease

CDC confirms 48 West Nile cases by June 30, 2026 — 38 involving brain disease. The earliest severe start in 22 years, with peak season still ahead. What to know now.

Medical Daily

Wisconsin Reports Its First West Nile Virus Activity as 23 States Enter a Record Early Season

Wisconsin confirmed its first West Nile detections July 14 as 23 states report the worst early-season activity since 2004. Here's who is most at risk.

Medical Daily

West Nile Virus Is Entering Peak Transmission Season, and 2026 Is Already the Worst in Over 20 Years

West Nile virus 2026 enters peak August-September window. CDC confirmed 48 cases by June 30, nearly 5x the historical average. Maricopa County: 29 cases, 5 deaths. No vaccine exists.

Medical Daily

CDC Says West Nile Virus Is Off to Its Earliest Start Since 2004 as Peak Season Approaches

CDC confirms 48 West Nile cases by June 30, 2026 — nearly 5x the historical average. Maricopa County leads with 29 cases and 5 deaths. Peak season is still ahead.

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