Culex modestus has been found in the marshland of the Thames Estuary. This mosquito has not been seen in the UK since 1945. It is worrisome because it can carry and transmit West Nile Virus.
Scientists are now using satellite imagery to locate habitats where the mosquito is most likely to be found. They will then work on the ground to study the mosquito more and determine whether there is any risk to human health.
WNV has been transmitted to humans occasionally in southern Europe but so far has no human has contracted the disease in the UK.