MANASSAS, Va.--(BUSINESS WIRE)--ATCC (American Type Culture Collection) today announced that the College of American Pathologists Proficiency Testing program has joined the ATCC Proficiency Standard program. The agreement means that the College of American Pathologists Proficiency Testing program will use highly tested reference microorganisms from ATCC in proficiency test panels it provides to its customers. ATCC developed the Proficiency Standard program to provide authenticated microorganisms and other biological materials for use in the manufacture of laboratory proficiency test panels.