Tick-borne encephalitis is a viral infection spread through the bite of an infected tick. It can also be spread via unpasteurized milk from infected cows, sheep and goats.

The disease occurs in parts of central, northern and Eastern Europe, Siberia and parts of Asia. In Europe, early spring through to late autumn are generally higher risk, however seasons vary by location. Travellers to areas where Tick-Borne Encephalitis is present may be at risk when walking, camping or working in woodland areas.

Travellers should avoid known heavily tick-infested areas of forest and woodland during transmission seasons. Bite avoidance measures should also be employed when in risk areas and body should be checked regularly for ticks.