Funding for this research was provided by:
Pennsylvania Department of Agriculture (44166102)
Received: 13 July 2020
Accepted: 20 November 2020
First Online: 9 December 2020
Ethics approval and consent to participate
: The design of the experiment and animal sampling protocol were approved by the University of Pennsylvania Institutional Animal Care and Use Committee (IUCAC protocol 806194). All animal sampling was conducted on private farms with the permission of the farm owners.
: Not applicable.
: The authors declare that they have no competing interests.