As of March 3, the German government has removed all countries
from its high-risk areas list, including the U.S. Individuals from
these countries are no longer ordered to quarantine upon arrival or
have additional PCR tests taken.
However, travelers, regardless of their departure country, are
required to complete digital entry registration. Additionally,
individuals must have proof of full COVID-19 vaccination and proof
of a negative PCR or antigen test taken within 48 hours before
arrival, or they must have proof of complete recovery within 90
days before arrival. Furthermore, children under the age of six are
excluded from the aforementioned testing requirements. Further
information on Germany's entry requirements can be
found
here.