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American Focus > Blog > Tech and Science > Scientists Discover West Nile Virus in The UK For The First Time : ScienceAlert
Tech and Science

Scientists Discover West Nile Virus in The UK For The First Time : ScienceAlert

Last updated: May 25, 2025 8:00 pm
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Scientists Discover West Nile Virus in The UK For The First Time : ScienceAlert
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The UK Health Security Agency recently reported the first detection of traces of the West Nile virus in mosquitoes in the UK. This is a significant development as the virus has never been found in mosquitoes in the country before. The virus, first identified in Uganda in 1937, is transmitted by Culex mosquitoes, particularly the species Culex pipiens, which mainly feeds on birds. Birds are the primary host for the virus, and it spreads in a cycle from infected birds to mosquitoes and back to birds. Occasionally, mosquitoes can transmit the virus to humans or other animals.

Most human infections do not cause any symptoms, but in rare cases, the virus can lead to severe illness, including encephalitis or meningitis. Older adults, especially those over 50, are most at risk of serious complications. The virus is not normally spread from person to person, but rare cases of transmission have occurred through blood transfusions or from mother to baby during pregnancy.

Experts believe that the virus may have arrived in the UK via migratory birds infected elsewhere. The detection was made as part of a routine mosquito surveillance program run by the Animal and Plant Health Agency. Mosquitoes collected from marshlands in south-east England tested positive in PCR tests, which detect fragments of the virus’s genetic material.

While the detection of the virus in UK mosquitoes is noteworthy, the public health risk remains very low. No human cases have been reported in the UK to date, and current summer temperatures are not yet conducive to sustained transmission. Travelers are advised to take standard mosquito precautions, especially in southern Europe where cases are rising. Continued surveillance and public awareness will be key to staying ahead of the risk as climate patterns shift.

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TAGGED:DiscoverNileScienceAlertScientiststimevirusWest
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