No vaccinations are required for entry into Germany.
However, between spring and autumn there is an increased risk of contracting illnesses caused by ticks, such as Lyme disease and tick-borne encephalitis (TBE). Ticks are usually found in ground-covering vegetation. The best protection against them is to wear clothing that covers as much of the skin as possible. If you are bitten, you should seek medical attention as a precaution.
The areas of highest risk are Baden-Württemberg and Bavaria, as well as certain regions within Hessen, Rhineland-Palatinate and Thuringia. In these areas, TBE vaccinations are recommended for anyone likely to spend a lot of time outdoors.