https://veterinaryresearch.biomedcentral.com/articles/10.1186/s13567-021-00977-z
https://veterinaryresearch.biomedcentral.com/articles/10.1186/s13567-021-00979-x
https://veterinaryresearch.biomedcentral.com/articles/10.1186/s13567-021-00981-3
https://veterinaryresearch.biomedcentral.com/articles/10.1186/s13567-021-00982-2
https://veterinaryresearch.biomedcentral.com/articles/10.1186/s13567-021-00978-y
https://veterinaryresearch.biomedcentral.com/articles/10.1186/s13567-021-00976-0
https://veterinaryresearch.biomedcentral.com/articles/10.1186/s13567-021-00983-1