Please inform your shelter of your illness, as well as your county health department. You must immediately go into isolation to avoid contacts in your accommodation. Isolation can be completed in your room.
If you have had personal contact with a person who has been found to have SARS-CoV-2 coronavirus and you are not fully vaccinated or recovered, you should stay home and contact the appropriate health department immediately - even if you have no signs of illness. Exceptions to the quarantine requirement apply to those who have been vaccinated and those who have recovered. If you have further questions, contact your local health department. You can find the health office responsible for you in a database of the Robert Koch Institute. https://tools.rki.de/plztool/