AUTHOR=Yu Changqing , Wu Yang , 耿 雨露 TITLE=Development and application of a quadruplex real-time PCR method for Torque teno sus virus 1, Porcine circovirus type 2, pseudorabies virus, and porcine parvovirus JOURNAL=Frontiers in Cellular and Infection Microbiology VOLUME=14 YEAR=2024 URL=https://www.frontiersin.org/journals/cellular-and-infection-microbiology/articles/10.3389/fcimb.2024.1461448 DOI=10.3389/fcimb.2024.1461448 ISSN=2235-2988