Information on the current situation can be found at the following linked pages:
Regulations for persons entering Germany
Traveling during the COVID-19 pandemic provided by the Federal Foreign Office
Current information for travelers provided by the Federal Ministry of Health
Coronavirus: Frequently Asked Questions - Travel restriction / border control, provided by the Federal Ministry of the Interior, Building and Community
Frankfurt airport: Test possibilities at Frankfurt Airport pharmacies (see ‘Test possibilities' below 'At the Airport’), FAQ on Covid-19, and information on Covid-19
Information for the stay in Germany and Dagstuhl/Wadern
Traveling by train during the coronavirus pandemic provided by Deutsche Bahn
Corona rapid tests in the Merzig-Wadern district (English translation available by clicking on “Sprache”)
Information on COVID-19 from the Robert Koch Institute (RKI) including weekly situation reports and a dashboard (in German) with notified case numbers by state (Bundesland) and district (Landkreis). RKI is the German federal government agency and research institute responsible for disease control and prevention.
Smart phone apps from the Robert Koch Institute:
Corona Warn App (including European vaccination certificate option)
CovPass (European vaccination certificate option only)