The 26 laboratories participating in the 2021 PEP Program, were as follows:
- AnLab Ltd., Czech Republic
- Biomedical Diagnostics ( Biodoc), Germany
- CEMIB - Multidisciplinary Center for Biological Investigation on Laboratory Animal Science, Brazil
- Central Institute for Experimental Animals, (CIEA), Japan
- Cerberus Sciences, Australia
- Charles River Laboratories (RADS), USA
- Charles River Laboratories France
- Charles River Laboratories, Japan
- ComPath, Australia
- Preclinical Research Center, Daegu-Gyeongbuk Medical Innovation Foundation, Korea
- Dynamimed S.L. Madrid, Spain
- Envigo RMS SEL, Italy
- Francis Crick Institute, Microbiology Laboratory, UK
- IDEXX Bioresearch, Ludwigsburg, Germany
- IDEXX BioAnalytics, Missouri, USA
- The Jackson Laboratory, USA
- Microbiological Diagnostics, Germany
- Microbiological Monitoring Lab., Laboratory Animal Resource Center, KRIBB
- National Animal Lab Center, Taipei, Taiwan
- National Institutes for Food and Drug Control (NIFDC, Division of Laboratory Animal Monitoring), China
- National Laboratory Animal Center (NLAC-MU), Mahidol University, Thailand
- Optipharm, Inc., Korea
- QM Diagnostics, Netherlands
- SAHMRI- ComPath, Austrailia
- VRL Maryland, LLC, USA
- XpressBio, Maryland, USA