Tick-Borne Encephalitis: The Vaccine European Hikers Forget

Ask most travellers what vaccines they need for a European hiking trip, and the honest answer is usually: none come to mind. Europe doesn't carry the same "check your vaccines" instinct that a trip to Southeast Asia or East Africa does — and for most of what you'd catch there, that instinct is basically right. But there's one genuine exception that a lot of pre-trip planning simply misses: tick-borne encephalitis, or TBE.

As one travel medicine specialist put it at a recent infectious disease conference, discussing Central European risk: you don't actually have to travel internationally at all to encounter TBE anymore — it's already established in large parts of Germany. That's exactly the blind spot this post is here to close.

What TBE actually is

Tick-borne encephalitis is a viral infection spread through the bite of an infected Ixodes tick — the same genus responsible for Lyme disease in the same regions, though TBE and Lyme are different diseases with different causes (TBE is viral, Lyme is bacterial) and different levels of treatability. TBE has no antiviral treatment; care is entirely supportive. It can also, less commonly, be transmitted by drinking unpasteurised milk or dairy products (typically goat's milk) from an infected animal.

Many infections are mild or asymptomatic, but a meaningful share progress to neuroinvasive disease — meningitis, encephalitis, or meningoencephalomyelitis — which can mean hospitalisation, and sometimes permanent neurological effects such as memory or concentration problems, or in more severe cases, paralysis. Risk of a poor outcome rises meaningfully with age, with travellers 60 and older facing a higher risk of severe disease.

Why this is a genuine, current concern — not a theoretical one

TBE isn't a rare curiosity. Roughly 5,000–10,000 cases are reported annually across endemic countries, and the trend has been moving in the wrong direction: incidence has been rising in recent years, and the geographic range of endemic areas has been expanding, a shift researchers link to warmer temperatures, more outdoor recreation, and changing tick habitats.

A 2026 academic review looking specifically at travel-associated TBE found that of over 22,000 surveillance-reported cases across Europe from 2015–2022, a small but real share were travel-associated — with 97% of the clinically-detailed travel cases requiring hospitalisation, a median hospital stay of over a week, and at least one death among the reviewed cases. The most commonly visited countries among those travel-associated cases: Austria, Russia, Sweden, and Switzerland — not exactly obscure, off-the-beaten-path destinations.

Where TBE is actually endemic

TBE-endemic areas span a wide arc from western and northern Europe through to eastern and northern Asia. Countries with recognised TBE-endemic zones include Austria, Germany, Switzerland, Czech Republic, Slovakia, Poland, Hungary, Slovenia, the Baltic states (Estonia, Latvia, Lithuania), Sweden, Finland, and parts of Russia, along with China, Mongolia, and Japan further east. Within Germany specifically, the highest-risk areas concentrate in the southern states — Bavaria and Baden-Württemberg account for the large majority of the country's cases.

This is deliberately not an exhaustive list — endemic zones shift year to year, and the risk within a country can vary a great deal by specific region. Check current maps and country-specific guidance before travel:

• CDC Areas at Risk for TBE
• ECDC TBE Vaccine Scheduler

Who's actually at meaningful risk

This is not a vaccine every European traveller needs. Risk concentrates heavily around specific activities and locations:

• Outdoor, forest-adjacent activities: hiking, camping, mountain biking, trail running, foraging, hunting, or fishing in or near woodland — the ticks that carry TBE favour forest edges with dense low brush, not city parks or urban trails
• Season: transmission runs April through November, peaking in early-to-mid summer and again in early autumn
• Trip length and pattern: both short trips with intensive daily outdoor exposure, and longer or repeated trips with more occasional exposure, can carry meaningful risk — this isn't only a long-stay-traveller concern
• Unpasteurised dairy: consuming raw milk or cheese, particularly from goats, in an endemic area

A city-break itinerary through Vienna, Munich, or Prague with no significant time in forests or rural areas carries very low TBE risk. A hiking or cycling trip through the Alps, the Black Forest, or rural Baltic countryside is a genuinely different risk profile — this is the trip type where the vaccine conversation is worth having.

The vaccine: TICOVAC

The TBE vaccine available in the US, TICOVAC (also marketed as FSME-IMMUN in parts of Europe), is an inactivated vaccine approved for people aged 1 year and older, with separate formulations for children/adolescents (1–15 years) and adults (16+). It's been used in Europe for over two decades with a strong safety record, and study data has found effectiveness above 95% for people who complete three doses on schedule.

Standard schedule: three primary doses, with the second given anywhere from 14 days to 3 months after the first (1–3 months for the pediatric formulation), and the third given 5–12 months after the second. A booster is recommended at least 3 years after completing the primary series if ongoing exposure risk continues.

Accelerated schedule: available for travellers who can't complete the full timeline before departure — worth asking about specifically if your trip is coming up sooner than the standard schedule allows, since even two doses provide meaningful protection.

Prevention beyond the vaccine

Whether or not vaccination fits your trip, standard tick-bite precautions matter: wear long trousers and sleeves in wooded or brushy areas, use an EPA-registered tick repellent, stick to the centre of trails rather than pushing through undergrowth, do a thorough tick check after time outdoors (ticks need time attached to transmit TBE, unlike some other tick-borne infections, so prompt removal helps), and avoid unpasteurised dairy products in endemic areas. This is a different prevention routine from the mosquito-focused advice covered in our mosquito bite prevention guide — ticks and mosquitoes call for different tactics, and it's worth not defaulting to just one.

Getting it sorted

Given the three-dose primary schedule, this is worth raising well ahead of a hiking or outdoor-focused European trip — see our when-to-see-a-travel-doctor guide for general timing, though note TBE's schedule runs longer than many routine travel vaccines if you're aiming for the standard (rather than accelerated) course. Check your itinerary against current risk using the Travel Vaccine Map tool, and use Find a Clinic to find a provider who stocks TICOVAC, since it isn't yet standard stock everywhere.

Sources: CDC Tick-Borne Encephalitis, CDC Yellow Book – Tick-Borne Encephalitis, ECDC TBE Vaccine Scheduler, ACIP TBE Vaccine Recommendations, MMWR.