AUTHOR=Gil da Costa Rui M. , Abreu-Silva Ana LĂșcia TITLE=Editorial: Biology and Pathology of Tumor Viruses in Animals JOURNAL=Frontiers in Veterinary Science VOLUME=8 YEAR=2021 URL=https://www.frontiersin.org/journals/veterinary-science/articles/10.3389/fvets.2021.797596 DOI=10.3389/fvets.2021.797596 ISSN=2297-1769