West Nile Virus

West Nile virus has been detected in mosquitoes across all five boroughs of New York City. The virus, transmitted by mosquitoes, can infect humans, birds, horses, and other mammals, though many infected individuals show mild or no symptoms.

West Nile virus was detected in a mosquito on Langley Air Force Base in Hampton, prompting ground fogging operations to be moved forward to Wednesday night to reduce the risk of infected mosquitoes.

Tarrant County Public Health confirmed the first human West Nile virus case of 2026. The case is described as the severe neuroinvasive form of the disease.

A third mosquito trap sample collected in San Marcos on July 17 has tested positive for West Nile Virus, as reported by Hays County in a press release.

A third mosquito trap in Hays County has tested positive for West Nile virus. This marks the third positive test in the area.

Climate Central analyzed 239 U.S. cities and found an average increase of 18 'mosquito disease days' per year between 1970 and 2025, with Nashville experiencing a 22-day increase. Warmer temperatures extend mosquito activity, raising disease transmission risks like West Nile virus.

A human West Nile virus case has been confirmed in Boulder County. Officials recommend using EPA-registered insect repellent containing DEET, picaridin, or similar ingredients to reduce mosquito bite risks.

Mecklenburg County officials reported the first detection of West Nile virus in local mosquitoes and urged residents to take precautions. Recommendations include eliminating standing water, using insect repellent, and avoiding sweet-smelling scents to reduce mosquito bites.

West Nile virus was detected in mosquitoes in Mecklenburg County, North Carolina, according to state health officials. The exact location of the mosquito group remains unspecified, and officials noted the finding as of July 20.

West Nile virus was detected in mosquitoes collected in Mecklenburg County, North Carolina, with no human cases reported. The CDC notes it is the leading mosquito-borne illness in the U.S., and officials emphasize prevention measures like repellent and eliminating standing water.

Southern California is experiencing increased mosquito activity, with efforts to combat populations through sterile male mosquito releases. West Nile virus cases in mosquitoes have risen earlier than usual, though human infections remain low. An invasive Aedes aegypti species, capable of transmitting diseases like dengue and Zika, is also spreading in the region.

Louisiana confirmed its first 2026 West Nile virus case in Ouachita Parish, with infected mosquitoes detected in 13 parishes. The U.S. is experiencing its worst early-season West Nile surge in two decades, with 48 national cases reported by June 30, including 38 severe cases.

West Nile virus-positive mosquitoes have been reported in New York City and Long Island, according to the New York State Department of Health. The virus is more common during the summer.

The New York State Department of Health confirmed West Nile virus in mosquito pools across Nassau, Rockland, and Suffolk counties and advised residents to follow safety protocols to prevent potential outbreaks.

West Nile virus has been detected in mosquitoes and a wild bird in Wisconsin, marking the first confirmed cases of 2026. Health officials are urging the public to take precautions.

Los Angeles County officials confirmed the first human case of West Nile virus this year, urging residents to take mosquito precautions. An Antelope Valley resident was hospitalized with West Nile virus encephalitis after symptoms began in late June.

Los Angeles County reported its first case of West Nile virus in 2026, involving a very ill individual. The case occurs amid a nationwide surge in virus activity.

Los Angeles County officials reported the county's first case of West Nile virus in 2026, involving a very ill person. The incident occurs amid a nationwide surge in virus activity.

Los Angeles County confirmed its first human case of West Nile virus for the 2026 season. The Antelope Valley resident is hospitalized with West Nile virus encephalitis after symptoms began in June.

West Nile virus has been confirmed in mosquitos in Berkshire County, specifically in Pittsfield, as reported by the Massachusetts Department of Public Health.

Two mosquito trap samples collected in San Marcos on Tuesday tested positive for West Nile Virus, according to a release from Hays County.

The Louisiana Animal Disease Diagnostic Laboratory analyzes thousands of mosquito samples to track and prevent the spread of diseases like West Nile virus. The lab processes up to 25,000 vials annually, testing for pathogens in mosquitoes collected from 30 parishes, using DNA analysis to inform public health responses.

West Nile virus is spreading faster than in two decades, with early-season activity detected in Orange and Los Angeles counties. Local authorities are advising residents to take precautions to avoid mosquito bites.

West Nile virus is spreading faster than in two decades, with increased activity observed in Orange and Los Angeles counties. Authorities are urging residents to avoid mosquito bites to protect themselves.

The CDC is urging people to prevent mosquito bites as West Nile Virus season begins its earliest and worst start in over two decades, with at least 48 confirmed cases. Health officials recommend using bug spray and mosquito-control efforts to mitigate the risk.

The CDC issued a July 4 holiday advisory warning of a two-decade high in West Nile virus cases, with 48 cases reported through June 2026, including 38 severe neuroinvasive cases across 23 states. The agency recommends using EPA-registered insect repellent, wearing protective clothing, and avoiding outdoor activity during dusk and dawn to prevent mosquito bites.

A young American crow from El Cerrito tested positive for West Nile virus in Contra Costa County in 2026, marking the first bird case this year. No human cases have been reported, but mosquitoes from Martinez and another location tested positive for the virus.

New York City will spray non-residential marshes and wetlands in the Bronx, Brooklyn, Queens, and Staten Island between Tuesday and Thursday to combat West Nile Virus, as announced by the New York City Department of Health.

San Bernardino in Southern California has detected West Nile virus in mosquito samples, joining a growing list of cities in the region. The infected mosquitoes were collected in San Bernardino, marking the first West Nile virus-positive mosquito sample detected this year in the area served by the county’s Environmental department.

West Nile virus was detected in mosquitoes near Cass Street in North Nashville in 2026, prompting targeted public health measures. The detection follows elevated 2025 levels that resulted in one human case. Officials are distributing educational materials, applying larvicide, and urging residents to eliminate standing water and take preventive measures against mosquito bites.

The U.S. is experiencing a 22-year spike in West Nile virus cases, with activity at some of the highest levels in years. The article highlights where the virus is most active within the country.

West Nile virus cases in the U.S. are experiencing a 22-year spike, with the highest activity levels observed recently.

Mosquitoes in Michigan are active from late spring to early fall and can carry diseases like West Nile virus and Jamestown Canyon virus. While no human cases have been confirmed in Michigan this year, both viruses have been detected in mosquito populations in Saginaw, Midland, and Kent counties. Dr. Brandon Karmo from Henry Ford Health discusses prevention methods.

West Nile virus was confirmed in mosquitoes collected from eight Orange County cities, including Costa Mesa, Fullerton, Garden Grove, and Westminster this week. Last week, infected samples were reported in Buena Park, Huntington Beach, Santa Ana, and Seal Beach. Inspectors will be monitoring the areas.

The CDC reports an early and severe West Nile virus season with 48 confirmed cases by June 30, 38 of which are severe, marking the worst start in over two decades. Arizona has been hardest hit, with 32 cases and four deaths, prompting officials to urge mosquito bite prevention measures like DEET use and eliminating standing water.

The CDC warns of an early and severe West Nile virus season, with 48 confirmed cases (38 severe) reported by June 30—far exceeding the 10-year average for the period. Arizona has the most cases, including four deaths, prompting officials to urge mosquito bite prevention measures like DEET-based repellent and eliminating standing water.

West Nile virus has been detected in North Nashville through a mosquito trap, prompting health officials to recommend mosquito precautions. The Metro Public Health Department confirmed the virus's presence in the area.

West Nile Virus has been detected in a mosquito pool in North Nashville, marking the first detection of 2026. Health officials urge residents to reduce mosquito populations and take preventive measures against bites.

West Nile Virus has been detected in Davidson County for the first time in 2026, according to Metro health officials. The detection was confirmed following the collection of a mosquito pool.

Health officials in Travis County have detected a positive mosquito pool for West Nile virus in the 78733 zip code. The report confirms the presence of the virus in the area.