Experts describe the risk of infection as "very low" but urge members of the public to be aware of ticks, small parasitic arachnids that are associated with spiders and mites.
The tick-borne encephalitis virus (TBE) is an infection that does not cause any symptoms in most people. However, some will suffer from flu-like symptoms and few will develop a more serious illness affecting the brain and central nervous system, according to Public Health England (PHE).
The infection is endemic in Scandinavia, continental Europe and Asia; it is now detected in Thetford Forest, eastern England and the border between the southern cities of Hampshire and Dorset.
Those who spend time walking in rural areas where infected ticks are found are at risk of contracting TBE and other ticks. diseases transmitted.
It is believed that one person was infected with TBE earlier this year and has achieved a full recovery. According to a statement, no other cases were identified in the UK.
3,079 cases of TBE were reported, including 9 related deaths, according to a PHE study.
The number of infections is increasing in Europe due to climate change and the increase in outdoor leisure activities, ie. according to PHE
It is possible that migratory birds have introduced TBE-infected ticks into the UK or that they have arrived with pets traveling from Europe, according to PHE.
"We are firing people to be 'aware of the ticks' and take tick safety measures, especially when they visit or work in long grass areas such as forests, wetlands and parks," says PHE's Nick Finn.
Mites are most active from May to October, according to the action of Lyme disease.
Avoiding deep vegetation and sticking to paths will reduce the risk of tick bites, as well as cover your skin and use of insect repellents.
And in July, the US House of Representatives ordered an investigation into whether the Department of Defense was experimenting with ticks and other insects as biological weapons.