This is a general-purpose complex medium for cultivation and isolation of fastidious bacteria, yeasts and moulds.  The formulation is based on the United States Pharmacopoeia (USP Medium II) and European Pharmacopoeia (EP Medium B).  Lecithin and Polysorbate 80 (Tween 80) are added to inactivate surface disinfectants. The medium can be incubated under aerobic or anaerobic conditions for sterility testing, air sampling and other areas of bacteriological investigation.