Federal President Frank-Walter Steinmeier and his wife Elke Büdenbender have been infected with the corona virus.
The symptoms of the disease are mild, said a spokeswoman in Berlin on Tuesday.
A rapid test and a PCR test were positive.
The Federal President and his wife immediately went into domestic isolation.
All close contacts have been informed.
According to the Office of the Federal President, Steinmeier received his third vaccination on November 12.
The 66-year-old Federal President and the 60-year-old Büdenbender are considered high-risk patients: Steinmeier donated a kidney to his wife in 2010.
In view of the high number of corona infections, the first countries are preparing longer protective requirements under the controversial new nationwide legal framework.
In Mecklenburg-Western Pomerania, which currently has the highest seven-day incidence of more than 2400, essential measures such as the obligation to wear masks indoors and test requirements for unvaccinated people in the catering trade should continue until April 27, as Minister of Health Stefanie Drese (SPD) said on Tuesday after a cabinet meeting announced.
Hamburg also wants to continue the mask requirement indoors beyond April 2nd.
The background is the new nationwide legal basis that the traffic light coalition put into effect on Sunday under open protest from the federal states.
Initially, all countries can still use a transitional period up to April 2nd at the latest, during which the previous rules will remain in place.
In principle, only a few general protective requirements in everyday life, such as masks and tests in facilities for vulnerable groups such as nursing homes and clinics, are then possible for them.
However, there may be further restrictions for regional "hotspots" if the state parliament determines a critical situation for them.