No vaccinations are required for entry into Germany.
However, in spring there is a greater risk of contracting illnesses caused by ticks such as Lyme disease and viral early summer meningoencephalitis. Ticks are blood-sucking parasites which are found all over the world. They feed on the blood of their host and are usually found in ground-covering vegetation. If you find a tick on you, remove it very carefully with a fine pair of tweezers, taking care not to squeeze it. Or, even better, seek medical attention.
The areas at highest risk are Baden-Württemberg and Bavaria, as well as certain regions within Hessen, Rhineland-Palatinate and Thuringia. Not every tick bite leads to infection in humans. The best protection against ticks is to wear clothing that covers as much of the skin as possible.