Help Please log in to determine if you are eligible to purchase PT Programs. VIROLOGY ANTIGEN DETECTION (DFA) - VR2 Analytes/procedures in bold type are regulated for proficiency testing by the Centers for Medicare & Medicaid Services (CMS). Analyte/Procedure Challenges per Shipment Number of Shipments A B C Adenovirus antigen 1 1 Three shipments per year Cytomegalovirus antigen 1 1 Herpes simplex virus (HSV) antigen 1 1 Influenza A antigen 1 1 Influenza B antigen 1 Parainfluenza antigen 1 1 Respiratory syncytial virus (RSV) antigen 1 1 Varicella‑zoster antigen 1 1 Educational challenge 1 Program Information Five 5‑well slide specimens Shipping Schedule Shipment A: March 15 Shipment B: July 12 Shipment C: November 1 Guest Log in/Register