Tick-borne encephalitis IgG – IgG antibodies to the tick-borne encephalitis virus indicate chronic or past infection, as well as whether a person has had a tick-borne encephalitis vaccination. The diagnosis of tick-borne encephalitis is based on both IgM and IgG antibodies in the blood. A person infected with tick-borne encephalitis virus may experience flu-like symptoms, such as a headache, low-grade fever and aching body aches, two to three weeks after a tick bite. Blood and cerebrospinal fluid tests are performed to confirm the diagnosis. There is no specific treatment for tick-borne encephalitis and antibiotics are not effective, so each person is treated according to the symptoms he or she experiences. People who get tick-borne encephalitis acquire immunity that lasts a lifetime. Elevated tick-borne encephalitis IgG indicates that immunity is established (in the absence of elevated IgM antibodies and symptoms).

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