Funding for this research was provided by:
Oesterreichische Nationalbank (13491)
Received: 31 October 2019
Accepted: 24 January 2020
First Online: 12 February 2020
Compliance with ethical standards
: Claudia Schabereiter-Gurtner was responsible for designing the PCR assay; later she was hired by Ingenetix GbmH. The other authors have no conflict of interest to declare.