Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (Open Access Publishing Programme)
Received: 16 July 2020
Accepted: 23 October 2020
First Online: 17 November 2020
Ethics approval and consent to participate
: Sampling was part of the normal veterinary diagnostic investigation on farms and as such was not for scientific purposes. All sampling was undertaken strictly according to the applicable national animal welfare regulations and with consent of farm owners. Farm data was anonymized.
: All authors consent to publish.
: The authors declare that they have no competing interests.