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● TRACKER Updated 4d ago · 23 sources tracked

First West Nile virus-positive mosquitoes reported in three Las Vegas ZIP codes

The Southern Nevada Health District has found West Nile virus-positive mosquitoes in three Las Vegas ZIP codes, adding to the growing list of areas affected by the virus across the US. Positive mosquito tests have been reported in several states, including Connecticut, Louisiana, Massachusetts, and Indiana. Health officials are urging residents to take precautions to prevent mosquito bites.

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What changed

The Southern Nevada Health District reported the first West Nile virus-positive mosquitoes in three Las Vegas ZIP codes.

Live updates

  1. West Nile virus-positive mosquitoes found in Las Vegas

    The Southern Nevada Health District has found West Nile virus-positive mosquitoes in three Las Vegas ZIP codes, adding to the growing list of areas affected by the virus across the US. Positive mosquito tests have been reported in several states, including Connecticut, Louisiana, Massachusetts, and Indiana. Health officials are urging residents to take precautions to prevent mosquito bites.

    Why it matters

    The discovery of West Nile virus-positive mosquitoes in Las Vegas ZIP codes comes as the virus continues to spread across the US. Several states have reported positive mosquito tests and human cases, prompting health officials to raise concerns about the risk of infection. The virus is typically spread through the bite of an infected mosquito and can cause serious illness in humans.

    What is confirmed

    • The Southern Nevada Health District has found 14 positive mosquito pools this season.
    • Connecticut mosquitoes continue to test positive for West Nile virus.
    • West Nile virus-positive mosquitoes have been found in Monroe County, Indiana.
    • The Massachusetts Department of Public Health has announced the first human case of West Nile virus.

    Still unconfirmed

    • No rumors found.

    What to watch next

    • Further positive mosquito tests in other areas
    • Reports of human cases of West Nile virus
    • Updates on vaccination efforts and public health campaigns
    Sources used for this update (5)
    1. consent.yahoo.com — Connecticut mosquitoes continue to test positive for West Nile virus. Here's what to know
    2. eu.capecodtimes.com — For the first time, Chatham mosquitoes test positive for West Nile virus
    3. www.wbiw.com — West Nile Virus detected in mosquitoes in Monroe County
    4. www.boston25news.com — Massachusetts Department of Public Health announces first human case of West Nile virus
    5. eu.courierpress.com — West Nile virus found in sample group of mosquitos in Vanderburgh
    confidence 90%

  2. West Nile virus detected in multiple US states including Maryland and Rhode Island

    West Nile virus activity has expanded across the US in 2026. The Maryland Department of Health confirmed the first human case of the year in that state. Mosquito samples tested positive for the virus in three Rhode Island communities and several Connecticut cities and towns, including Milford. Louisiana is also reporting positive mosquito tests. In Nevada, the Southern Nevada Health District has found 14 positive mosquito pools this season. Health officials in Rhode Island have designated the statewide risk level for the virus as high.

    Why it matters

    West Nile virus is a mosquito-borne illness that can cause neurological disease in humans. Monitoring mosquito pools allows health departments to predict human outbreaks. These reports indicate a multi-state increase in viral prevalence for the 2026 season.

    What is confirmed

    • The Maryland Department of Health confirmed the first human case of West Nile virus in the state this year.
    • Rhode Island's risk level for West Nile virus is high statewide.
    • The Connecticut Agricultural Experiment Station detected West Nile virus-infected mosquitoes in Milford in late June.
    • The Southern Nevada Health District identified 14 mosquito pools positive for West Nile virus this season.

    Still unconfirmed

    • Mosquitoes in Louisiana are testing positive for West Nile Virus.

    What to watch next

    • Reports of additional human cases in Rhode Island and Connecticut
    • Updates on the number of positive mosquito pools in Southern Nevada
    Sources used for this update (4)
    1. turnto10.com — West Nile virus detected in mosquito samples in 3 Rhode Island communities
    2. www.aol.com — Here’s where West Nile virus has been detected in Connecticut in 2026
    3. wtop.com — Maryland reports 1st human case of West Nile virus this year
    4. 710keel.com — What Parts of Louisiana Have More Positive West Nile Tests in Mosquitoes
    confidence 100%

  3. Clark County reports 14 positive West Nile virus mosquito pools

    The Southern Nevada Health District has identified 14 mosquito pools positive for West Nile virus this season. This includes 10 additional pools found following the initial reports. Health officials are advising residents to take precautions against mosquito bites.

    What's confirmed:

    • The Southern Nevada Health District identified 14 total mosquito pools that tested positive for West Nile virus this season.
    • Ten additional mosquito pools tested positive for West Nile virus following the first reports of the season.
    • The Centers for Disease Control and Prevention reported that West Nile virus activity is occurring earlier than usual nationwide.
    Sources used for this update (9)
    1. Health officials report first West Nile virus-positive mosquitoes in Las ...
    2. More pools of West Nile virus-positive mosquitoes reported across Clark ...
    3. Mosquitoes with West Nile virus found in additional Clark County ZIP codes
    4. More mosquitoes test positive for West Nile virus in Las Vegas valley
    5. West Nile virus mosquito pools increase in Clark County | Local Las ...
    6. West Nile virus found in southern Nevada mosquitoes; health officials ...
    7. Additional mosquito pools test positive for West Nile virus in Clark ...
    8. Arbovirus Updates - Southern Nevada Health District
    9. Eleven Suffolk mosquito samples positive for West Nile virus
    confidence 100%

  4. West Nile Virus Detected in Las Vegas Mosquitoes

    Health officials report the first positive West Nile virus tests in mosquitoes for the season in Clark County. Positive samples were identified across three different Las Vegas ZIP codes.

    What's confirmed:

    • Mosquitoes in Clark County tested positive for West Nile virus.
    • Positive cases were reported in three Las Vegas ZIP codes.
    • These are the first positive tests for the current season in Clark County.
    Sources used for this update (7)
    1. First West Nile virus-positive mosquitoes reported in three Las Vegas ZIP codes
    2. Three Las Vegas area ZIP codes report West Nile virus-positive mosquitoes
    3. Mosquitoes in Clark County test positive for West Nile virus, health district reports
    4. Las Vegas mosquitoes test positive for West Nile virus
    5. First mosquitoes test positive for West Nile virus in Clark County for season
    6. Mosquitoes collected in three different Las Vegas ZIP codes test positive for West Nile virus
    7. West Nile virus detected in Las Vegas mosquitoes; here's how to protect yourself this summer
    confidence 100%