Tickborne Encephalitis Virus - IgG

What Does a Positive or Elevated IgG Result Mean?

A positive or elevated IgG result for TBEV suggests:

• Previous infection with tickborne encephalitis virus, even if symptoms were mild or unrecognized

• Immunity due to vaccination (if you’ve received a TBE vaccine)

• A resolved infection, where the acute phase has passed but the immune system retains long-term antibodies

This result typically does not indicate an active infection but rather past immune system exposure or protection.

Symptoms of Tickborne Encephalitis

TBE often has two phases:

1. Initial phase (flu-like):

   • Fever

   • Headache

   • Muscle aches

   • Fatigue

2. Neurological phase (in some cases):

   • Meningitis (inflammation of the brain and spinal cord linings)

   • Encephalitis (inflammation of the brain)

   • Confusion, memory problems, or motor difficulties

Not everyone infected develops severe symptoms, but when the brain is involved, TBE can lead to long-term neurological complications.

Next Steps

• If you have a positive IgG result without symptoms, this likely indicates past infection or successful vaccination—no treatment is needed.

• If there is concern about recent exposure or current symptoms, your healthcare provider may recommend TBEV IgM testing or additional evaluation.

• Vaccination is available in endemic areas and is highly effective for preventing TBEV infection.

Summary

The Tickborne Encephalitis Virus – IgG test detects long-lasting antibodies that suggest past infection or prior vaccination. A medium or elevated result typically indicates immunity and is not a sign of active illness. If you've recently traveled to or live in an area where TBEV is common, this result may help guide preventive or diagnostic decisions—especially when considered alongside IgM and clinical symptoms.

What is Tickborne Encephalitis Virus – IgG?

Tickborne Encephalitis Virus (TBEV) is a virus that causes tickborne encephalitis (TBE)—a serious infection affecting the brain and central nervous system. TBEV is transmitted through the bite of infected Ixodes ticks, and is most commonly found in parts of Central and Eastern Europe, Russia, and Northern and Eastern Asia.

The IgG antibody test for TBEV detects long-term immune response to the virus. IgG antibodies typically develop several weeks after infection or vaccination and can remain in the bloodstream for months or years, indicating past exposure, recovery from infection, or prior vaccination.