A potentially fatal disease spread to humans through tick bites has been found in the arachnids in the UK for the first time.
The tick-borne encephalitis virus generally produces no or only mild flu-like symptoms, but sometimes can affect the brain and central nervous system and can occasionally kill.
It is already present in mainland Europe and parts of Asia.
While describing the risk as "very low", Public Health England (PHE) has confirmed the presence of the disease in Thetford Forest and on the Hampshire-Dorset border.
It is investigating the prevalence of infected ticks, but in general, numbers have been on the rise because of increasing deer populations.
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They also live on other animals and in undergrowth. It is thought infected ticks could have arrived in the UK on migratory birds.
Ticks can also carry other diseases, such as Lyme disease.
