Annette (and fellow Histonetters): Biocare Medical offers a prediluted polyclonal Ab to H. pylori that's prediluted especially for Ventana stainers. According to the latest catalog, its $152.00 for a 50-test (5ml) vial, or $278.00 for two (2) 5 ml vials. I hope this info is helpful... J.D. Myers