Received: 13 July 2020
Accepted: 16 September 2020
First Online: 22 September 2020
Ethics approval and consent to participate
: All strategies and investigations were performed in accordance with the national recommendations for outbreak investigations of the German legally assigned institute for infection control and prevention (Robert-Koch Institute). Formal consent was therefore not required.
: Not applicable.
: The authors declare that they have no potential conflicts of interest.