Tick-Borne Encephalitis: Symptoms, Vaccine, Treatment and Prevention

Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026

Quick Answer: What is tick-borne encephalitis?

Tick-borne encephalitis is a viral illness spread mainly by infected tick bites in forested areas of Europe and Asia. It can begin with fever, headache, body aches and fatigue, and some people later develop neurological symptoms such as confusion, stiff neck or seizures. Seek emergency care for severe headache, confusion, paralysis, seizures or a fever above 103°F (40°C).

What the research says

• TBE vaccines work well in real-world use. A systematic review of 13 European studies found vaccine effectiveness estimates above 92% against TBEV infection in all age groups. Studies in Austria, the Czech Republic, Latvia and Switzerland estimated that vaccination prevented more than 1,000 TBE cases a year in those countries combined (Angulo et al., Vaccine, 2023). [1]

• Vaccine protection does not depend on antibody levels alone. After a three-dose primary series of FSME-IMMUN, antibodies persisted for more than 10 years in over 90% of younger people but in only 37.5% of those aged 60 and older, yet real-world effectiveness did not significantly decrease with time since the last dose (Steffen et al., Ticks Tick Borne Dis, 2021). [2]

• TBE can leave lasting effects, including in children. A systematic review found TBE is usually milder in children than in adults, with fewer lasting neurologic problems, but recent follow-up surveys identified a substantial proportion of children with long-term cognitive impairment (Steffen, Ticks Tick Borne Dis, 2019). [3]

What is tick-borne encephalitis?

Tick-borne encephalitis is a viral illness caused by tick-borne encephalitis virus, or TBEV. It can affect the nervous system and may cause swelling of the brain, called encephalitis, or swelling of the membrane around the brain and spinal cord, called meningitis.

Most people have no symptoms or have a flu-like illness. In some people, however, the infection progresses to neurological symptoms that can cause weakness, paralysis, confusion and seizures.

TBE is not one single geographic strain. The virus has three subtypes: European, Far Eastern and Siberian. The subtype is related to where the virus circulates and may influence the course of illness.

Where does tick-borne encephalitis occur?

TBE virus exists in parts of Europe and Asia. Because ticks in the United States do not carry TBE virus, travel history is an important part of assessing risk.

TBE subtype	General region described	Tick associated with transmission
European	Parts of eastern, central and northern Europe; most common in Estonia, Latvia and Lithuania.	Ixodes ricinus, also called the castor bean tick.
Far Eastern	Parts of eastern Russia, China and Japan.	Ixodes persulcatus, also called the taiga tick.
Siberian	Parts of Russia, including Siberia and the Urals region, and some parts of northeastern Europe.	Ixodes persulcatus, or taiga tick.

A person may not remember being bitten. Tell a healthcare provider about recent travel or outdoor activity in a TBE area if flu-like symptoms develop.

How does TBE spread?

TBE spreads mainly through the bite of an infected tick. The ticks that carry the virus live in forested areas in Europe and Asia.

The virus can also spread through drinking unpasteurized milk or milk products. The virus can also be transmitted through breast milk during breastfeeding. Avoiding unpasteurized milk and milk products is therefore part of prevention in areas where TBE occurs.

What are the symptoms of TBE?

TBE symptoms can occur in two phases. The first phase may look like an ordinary flu-like illness. The second phase, when it occurs, involves the nervous system and needs prompt medical attention.

Phase 1: Early flu-like symptoms

Initial symptoms may begin within about a week after a tick bite. They include:

• Fever.

• Headache.

• Body aches.

• Fatigue.

• Nausea.

• Loss of appetite.

These symptoms are not specific to TBE. They can occur with many illnesses. Recent travel to a region where TBE occurs helps a healthcare provider interpret them.

Phase 2: Neurological symptoms

A few days to a week after the early symptoms, and sometimes weeks after they improve, some people develop neurological symptoms. These may include:

• Fever.

• Vomiting.

• Sensitivity to light.

• Confusion or an altered mental state.

• Muscle weakness.

• Stiff neck.

• Facial paralysis.

• Seizures.

Neurological symptoms can indicate swelling of the brain or the membranes around the brain and spinal cord. They require medical evaluation rather than home monitoring alone. [4]

How long after exposure can symptoms appear?

Initial symptoms may start within about a week after a tick bite. If neurological symptoms occur, they may begin a few days to a week later. In some people, neurological symptoms develop weeks after the first symptoms get better.

After a diagnosis, neurological symptoms can develop as many as 20 days after the initial symptoms improve. This is why follow-up and attention to new symptoms matter, even after a temporary improvement.

What complications can TBE cause?

The main complications are encephalitis and meningitis. These conditions can affect the brain, spinal cord and nervous system.

Possible lasting complications include:

Complication	What it may affect
Paralysis	Muscle movement and independence.
Memory loss	Recall and day-to-day cognitive function.
Balance and coordination problems	Walking, movement and physical control.
Speech and language issues	Communication and understanding.

The subtype may influence the outlook. European and Siberian subtypes are less likely to lead to neurological complications than the Far Eastern subtype. Siberian subtypes can sometimes cause long-lasting or chronic illness.

Reported mortality is below 3% for European and Siberian TBE and as high as 35% for Far Eastern TBE. These figures describe populations and subtypes, not an individual person’s outcome. A healthcare provider is best placed to discuss risk in the context of travel history, symptoms and diagnosis.

When should you contact a healthcare provider?

Talk with a healthcare provider if you have been in an area where an infected tick could have bitten you and you develop flu-like symptoms. This applies even if you do not remember a bite.

Share the following details:

Information to share	Why it helps
Where you traveled or spent time outdoors	TBE risk depends strongly on geography.
When the exposure occurred	Symptoms can develop in phases over days or weeks.
Whether you noticed a tick bite	A remembered bite can support the exposure history, but its absence does not rule out exposure.
What symptoms appeared first	Early flu-like symptoms may precede neurological symptoms.
Whether symptoms improved and returned	A second phase can follow an interval of improvement.
Whether you drank unpasteurized milk or milk products	These can also carry TBEV.

When should you go to the emergency room?

Go to emergency care for tick-borne encephalitis signs such as a fever over 103°F (40°C), severe headache, confusion, difficulty breathing, paralysis or seizures.

• Fever over 103°F (40°C).

• Severe headache.

• Confusion or an altered mental state.

• Difficulty breathing.

• Extreme weakness.

• Paralysis.

• Seizures.

These symptoms may signal serious neurological or systemic illness. Do not wait for a routine appointment when they occur after possible exposure.

How is TBE diagnosed?

Healthcare providers consider symptoms and recent travel history. They may ask whether you recently returned from Asia or Europe, particularly from a region where TBEV-carrying ticks are common.

A blood test or lumbar puncture, also called a spinal tap, may be needed to confirm the diagnosis. Tell the provider about travel or time in a tick area even if you do not remember being bitten.

How is tick-borne encephalitis treated?

Tick-borne encephalitis (TBE) has no specific treatment, so care focuses on rest, fluids and pain relief, with hospital support for people who are severely ill. Rest, plenty of fluids and over-the-counter pain relievers may help with symptoms when a healthcare provider says they are appropriate.

People who are severely ill may need hospital monitoring. Some people need mechanical ventilation to help them breathe. Treatment decisions depend on symptoms, severity and the level of support required.

Do not attempt to manage confusion, paralysis, seizures, breathing difficulty or extreme weakness at home. These symptoms need emergency evaluation.

Can TBE be prevented?

Vaccination is the best way to prevent TBE for people at higher risk. This may include people taking part in outdoor activities in areas where ticks carry TBEV. Ask a healthcare provider or travel-health clinic whether vaccination is appropriate for your plans.

You can also reduce exposure to ticks and TBEV by combining several habits:

Prevention step	How to use it
Wear protective clothing	Choose long pants, socks and long-sleeved shirts in areas where ticks may be present.
Use repellent	Apply bug repellent with DEET according to the product label.
Check your body	Look for ticks after returning from outdoor activity. Ask someone to check areas you cannot see, such as your scalp, neck and back.
Check pets	Inspect pets after they have been outdoors and ask a veterinarian about tick protection.
Keep grass short	Short grass can reduce exposure around the home.
Avoid unpasteurized dairy	Do not drink unpasteurized milk or consume products made from it, such as some ice cream or cheese.
Plan before travel	Discuss vaccination and destination-specific precautions before traveling to an area where TBE spreads.

What is the difference between TBE and Lyme disease?

Both illnesses can spread through ticks, but they are different infections.

Feature	Tick-borne encephalitis	Lyme disease
Cause	A virus.	Bacteria.
Specific treatment	No specific treatment.	Treatable with antibiotics.
Geography	Parts of Europe and Asia; ticks in the U.S. do not carry TBE virus.	Some of the same areas as TBE in Europe and Asia.
Potential nervous-system involvement	Can cause encephalitis, meningitis, weakness, paralysis and seizures.	A different disease with a different clinical course.

A tick bite or flu-like illness cannot identify the cause by itself. A healthcare provider can interpret symptoms, geography and testing.

What questions should you ask a healthcare provider?

Useful questions about tick-borne encephalitis (TBE) include how to get vaccinated before travel, how to care for yourself at home and which symptoms to watch for.

• How can I get vaccinated if I’m traveling somewhere TBE spreads?

• How should I care for myself at home?

• Am I at risk for severe symptoms?

• What symptoms should I watch for?

• Could my travel history or unpasteurized milk exposure be relevant?

• Do I need a blood test or lumbar puncture?

• What should I do if symptoms improve and then return?

Conclusion

Tick-borne encephalitis is a viral illness linked mainly to infected tick bites in parts of Europe and Asia. It may begin with fever, headache, body aches, fatigue, nausea and loss of appetite. Some people later develop neurological symptoms, including confusion, muscle weakness, stiff neck, facial paralysis or seizures.

The most useful steps are practical: consider vaccination before higher-risk travel, wear protective clothing, use DEET repellent, check your body and pets after outdoor activity, keep grass short and avoid unpasteurized milk and milk products. Tell a healthcare provider about recent travel or tick exposure even if you do not remember a bite.

If you have possible exposure and flu-like symptoms, contact a healthcare provider. If you have a severe headache, confusion, difficulty breathing, extreme weakness, paralysis, seizures or a fever over 103°F (40°C), seek emergency care now.

Frequently Asked Questions

Is tick-borne encephalitis found in the United States?

Ticks in the United States do not carry the tick-borne encephalitis virus. TBE occurs in parts of Europe and Asia, so travel history is important when symptoms develop after possible exposure.

What are the first symptoms of TBE?

Early symptoms may begin within about a week after a tick bite and can include fever, headache, body aches, fatigue, nausea and loss of appetite.

Can TBE symptoms come back after improving?

Yes. Some people develop neurological symptoms a few days to a week after early symptoms, and sometimes weeks after the initial symptoms improve. After diagnosis, neurological symptoms can develop as many as 20 days after the initial symptoms get better.

What are the neurological symptoms of TBE?

The neurological symptoms of TBE can include fever, vomiting, sensitivity to light, confusion or an altered mental state, muscle weakness, stiff neck, facial paralysis and seizures.

Can TBE cause permanent problems?

TBE can. Complications may include permanent paralysis, memory loss, balance and coordination problems, and speech and language issues.

Is there a treatment for tick-borne encephalitis?

There is no specific treatment for TBE. Rest, fluids and over-the-counter pain relievers may help symptoms when appropriate. Severe illness may require hospital monitoring and mechanical ventilation.

Is there a vaccine for TBE?

Yes. A vaccine is available for people at higher risk, including some people planning outdoor activities in areas where ticks carry TBEV. Ask a healthcare provider or travel-health clinic whether vaccination fits your travel plans.

Can you get TBE from milk?

TBEV can spread through unpasteurized milk and milk products. Avoid unpasteurized milk products in areas where TBE occurs.

Should I tell a provider about travel if I do not remember a tick bite?

Yes. Tell a provider about recent travel or time in an area with ticks even if you do not remember being bitten.

When is TBE an emergency?

Go to emergency care for a fever above 103°F (40°C), severe headache, confusion or an altered mental state, difficulty breathing, extreme weakness, paralysis or seizures.

What is the difference between TBE and Lyme disease?

TBE is caused by a virus and has no specific treatment. Lyme disease is caused by bacteria and is treatable with antibiotics. They are different diseases even though both can spread through tick bites.

References

1. Angulo FJ, Zhang P, Halsby K, et al. A systematic literature review of the effectiveness of tick-borne encephalitis vaccines in Europe. Vaccine. 2023;41(47):6914-6921. PMID 37858450. https://doi.org/10.1016/j.vaccine.2023.10.014

2. Steffen R, Erber W, Schmitt HJ. Can the booster interval for the tick-borne encephalitis (TBE) vaccine ‘FSME-IMMUN’ be prolonged? A systematic review. Ticks Tick Borne Dis. 2021;12(5):101779. PMID 34298356. https://doi.org/10.1016/j.ttbdis.2021.101779

3. Steffen R. Tick-borne encephalitis (TBE) in children in Europe: epidemiology, clinical outcome and comparison of vaccination recommendations. Ticks Tick Borne Dis. 2019;10(1):100-110. PMID 30241699. https://doi.org/10.1016/j.ttbdis.2018.08.003

4. Centers for Disease Control and Prevention. Symptoms of Tick-borne Encephalitis. CDC. Updated June 23, 2026. https://www.cdc.gov/tick-borne-encephalitis/signs-symptoms/index.html

5. Hills SL, Gould CV. Tick-Borne Encephalitis. CDC Yellow Book. April 23, 2025. https://www.cdc.gov/yellow-book/hcp/travel-associated-infections-diseases/tick-borne-encephalitis.html

6. U.S. Environmental Protection Agency. Repellents: Protection against Mosquitoes, Ticks and Other Arthropods. EPA. Last updated August 31, 2026. https://www.epa.gov/insect-repellents

Disclaimer

This article is for general educational purposes and is not a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition.

It is educational content, not a diagnosis, prognosis or personalized treatment plan. A qualified healthcare professional should interpret symptoms, travel exposure, test results, vaccination decisions and treatment needs. Seek emergency care for severe neurological or breathing symptoms.