Tick-borne encephalitis (TBE) is an inflammation of the brain and brain membranes that is caused by a virus. The pathogen occurs in many European countries. In Germany, the main high-risk regions are Baden-Württemberg, Bavaria, Southern Hesse and southeast Thuringia, with isolated areas in central Hesse (Marburg-Biedenkopf district), Rhineland-Palatinate (Birkenfeld), Saxony (Vogtland district) and Saarland (Saar-Palatinate district). The TBE virus spreads primarily via small mammals such as mice. The virus is then transmitted to humans by infected ticks. Cases of TBE usually occur in spring and summer, occasionally in autumn.
The virus is transmitted by infected ticks. A tick bite can enable the virus to enter the human blood system. Not every bite from an infected tick leads to infection, however.
Very rarely, people can infect themselves by drinking tainted, unpasteurised milk from goats or sheep (and, in exceptional cases, from cows).
Important: TBE is not transmitted from person to person!
Most of those infected (approx. 70–95%) will remain free of symptoms or their disease will not progress into the second phase.
The symptoms of TBE disease usually occur in two phases:
If the illness breaks out, it usually happens 1 to 2 weeks after the tick bite, rarely up to 4 weeks after it.
People who fall ill are not infectious.
People particularly at risk include those living in high-risk areas who spend their leisure time outside, especially if this involves contact with grass or low bushes, or have close contact with animals who spend a lot of time outside. As people grow older, the disease becomes more serious. Senior citizens in particular are at higher risk of complications.
There are two ways to protect yourself against infection:
Vaccination against TBE is recommended for:
Three injections are required to establish immunity. A booster should be given after 3 years if there is a persistent risk of infection. Subsequent boosters must then be given every 5 years. Depending on the particular vaccine used, a booster injection should be given every 3 years from the age of 50 or 60.
If the person has already been infected, a subsequent injection will be unable to prevent an outbreak of the disease.
Important facts: Ticks can transmit a range of pathogens. Alongside TBE, another is Lyme disease. There is no prophylactic vaccination against Lyme disease, however.
Ticks become active in warmer weather (about 7°C and over). They particularly favour underbrush, bushes, tall grasses and loose piles of leaves. From there, ticks are wiped off and carried along unnoticed by persons or animals.
Your local health authority can provide you with further advice. Since TBE infections must be reported, they will alsohave the latest information and be very experienced in dealing with the disease.
More (specialist) information is also available online from the Robert Koch Institute (www.rki.de/fsme).
For more information about how vaccinations stop infection, visit the website set up by the Federal Centre for Health Education (www.impfen-info.de).