No compulsory vaccinations are required for direct entry into Vietnam from Germany, unless you are travelling from a yellow fever area or have been in transit there for a longer period of time.
The Federal Foreign Office strongly recommends checking the standard vaccinations according to the current vaccination calendar of the Robert Koch Institute for children and adults (www.rki.de) and updating them if necessary.
Vaccinations against hepatitis A in particular are recommended as travel vaccinations. For longer stays or special exposure, additional vaccinations against dengue fever, hepatitis B, typhoid, rabies and Japanese encephalitis should be considered. Individual travel medical advice is recommended in advance.