Paraphrased from §16: If a factor is determined that can lead to the appearance of an infectious disease, or if such a factor is presumed , the responsible office will take necessary measures to avoid individual or public threats. Personal data can be collected for those measures. The Constitutional Law of the Sanctity of your home is restricted for those measures. Objections and legal challenges won't have a delaying effect on those measures.
For the German speaking pedes: https://www.gesetze-im-internet.de/ifsg/index.html
Paraphrased from §16: If a factor is determined that can lead to the appearance of an infectious disease, or if such a factor is presumed , the responsible office will take necessary measures to avoid individual or public threats. Personal data can be collected for those measures. The Constitutional Law of the Sanctity of your home is restricted for those measures. Objections and legal challenges won't have a delaying effect on those measures.