Invasive mosquitoes capable of spreading deadly diseases are threatening Kent, with at least one variety already resident in the county.

Species such as the Asian tiger mosquito can spread dengue fever and chikungunya – a virus causing a fever of up to 40 degrees followed by joint pain that can last for years.

The large, aggressive mosquito bites during the day, unlike indigenous species.

It is already a problem in Italy and parts of southern Europe, and has been spotted in France as far north as Lyon.

An invasive mosquito already present in Kent is culex modestus.

This variety can spread West Nile virus, a disease that causes serious flu-like symptoms that last several days.

In serious cases it can cause swelling of the brain and spinal cord.

Experts from Public Health England have been monitoring several locations in north Kent including service stations, ferry ports and the Eurotunnel terminal, hoping to spot the invasive insects before they spread.

Dr Jolyon Medlock, programme leader with Public Health England’s Medical Entomology team, said: “One of the things we are looking at is the incursion of invasive mosquitoes which act as vectors for diseases such as dengue fever and chikungunya.

“The number of cases is fairly low in Europe at the moment but with climate change and increased globalisation there is the potential for that to change.”

Should the invaders be spotted, Dr Medlock said Public Health England will work with local authorities to see if pest control measures are necessary.

Dr Medlock said that while it is difficult to tell exactly how invasive species make it to Britain, there are a number of potential entry routes.

Asian Tiger Mosquitos use tyres manufactured in south east Asia as breeding spots, laying eggs which can survive dormant for up to 18 months.

When the tyres are exported to Europe the eggs travel with them, hatching when conditions are right.

Mosquitoes can also hitch rides on aeroplanes and in lorries and other vehicles stopping on the continent en-route to Britain.

The insects need water to reproduce and Dr Medlock said much can be done to minimise potential breeding sites.

He said: “One of the key strategies in Europe has been community participation in looking at their own houses and minimising potential aquatic habitats for mosquitoes - covering water butts and unblocking drains, things like that.

“There certainly would be a real effort required from communities to manage mosquitoes themselves.”

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