Funding for this research was provided by:
Received: 3 May 2021
Accepted: 9 August 2021
First Online: 26 August 2021
: The protocol for experimental infection as well as all procedures were officially approved by the Government Office of Upper Bavaria, Munich, Germany (authorization reference number 55.2-1-54-2532-87-12). The study was compliant with all relevant European guidelines and regulations for animal experiments. The study was carried out in compliance with the ARRIVE guidelines. Collection of field samples from sows were also approved approved by the Government Office of Upper Bavaria, Munich, Germany (authorization reference number 55.2-154-2532.2-16-13). Sampling of the boars was approved by the ethical commission of the veterinary faculty of the LMU, Munich (authorization reference number: 245-17-12-2020).
: Not applicable.
: The authors declare that they have no competing interests.