After contact with a person suffering from tuberculosis, the contact person is identified by the public health department as part of a so-called environmental investigation. Contact is then established. In a personal meeting, the employees of the public health department clarify the individual risk of infection and advise on how to proceed. If there is a relevant risk, a precautionary examination is carried out. It is possible to contact the public health department independently at any time. As a rule, the public health department in the district of your main residence or place of stay is responsible. The RKI zip code tool can be used to find the responsible health authority by entering the zip code.