Tick-borne Encephalitis: Symptoms, Prevention and Vaccine

Tick-borne encephalitis is one of the most dangerous "seasonal" infections: you can catch it from a single tick bite, and the consequences for the nervous system can be severe and lasting. Yet it is preventable: there is a vaccine and emergency protection. Here are the symptoms of tick-borne encephalitis, its incubation period, what to do after a bite and how to stay safe.

What Tick-borne Encephalitis Is and How You Catch It

The cause is the tick-borne encephalitis virus, transmitted through the bite of an infected (ixodid) tick. Less often infection comes from raw goat's or cow's milk. Ticks are active in the warm season — spring to autumn — so the disease is seasonal. Not every tick is infected, but you cannot tell in advance, so any attached tick is a reason for caution.

Symptoms and Incubation Period

The incubation period is usually 7–14 days. The illness often runs in two waves: first a flu-like phase (fever, weakness, headache and muscle pain), then a brief improvement, and in some people a second wave with nervous system involvement: severe headache, vomiting, neck stiffness, impaired consciousness. It is the second phase that is dangerous.

Why It Is Dangerous: Consequences for the Nervous System

Severe forms cause meningitis and encephalitis with possible lasting consequences — paralysis (especially of the neck and arm muscles), coordination problems and prolonged weakness. Some consequences can persist for a long time. Severity depends on the virus subtype and how timely care is, so there is no room for delay.

What to Do After a Tick Bite

The tick should be removed as quickly and correctly as possible (or see a clinic) and, if possible, submitted for testing. In endemic regions a doctor assesses the need for emergency prophylaxis after a bite. The full sequence is in the article on what to do after a tick bite. "Waiting for symptoms" in a dangerous region is not advisable.

Diagnosis and Tests

The diagnosis is based on the clinical picture, a bite in season and lab tests — IgM and IgG antibodies to the virus in the blood (and in cerebrospinal fluid with CNS involvement). A complete blood count may show non-specific leukocyte changes. If you have a confusing antibody report, you can upload it for decoding.

Treatment

There is no specific antiviral treatment for tick-borne encephalitis — care is supportive, in hospital for severe forms: managing brain swelling, supporting breathing, rehabilitation. This is exactly why the focus is on prevention: preventing the disease is far more effective than treating its consequences.

Prevention and the Vaccine

Routine vaccination is the most reliable protection for residents and visitors of endemic regions; the course is started in advance, before the tick season. In addition: repellents, covering clothing, checking the body after walks, and quick tick removal. After a bite in an unvaccinated person in a dangerous region, emergency prophylaxis may be used — prescribed by a doctor.

When to See a Doctor Urgently

Immediately — for fever, severe headache, vomiting, light sensitivity, muscle weakness or impaired consciousness within 1–3 weeks after a tick bite or a visit to the forest in season. Do not wait for it "to pass on its own". If unsure, you can describe your symptoms — the service suggests how urgent it is.

This article is for informational purposes only and does not replace a doctor's consultation. Prevention and treatment are determined by a specialist.