laboratory reagents - microbiology - identification discs - bacteria - BV disc, set x50tests, Diagnostic discs BV-factor are designed to detection and isolation of Haemophilus spp. PRINCIPLE: Paper discs are impregnated with bacitracin B (5 IU) and growth factors in form of nicotinamide adenine dinucleotide - NAD (BV-factor). Growth factors are releasing from disc to agar. Different species of Haemophilus create zone around particular disc according to nutrition requirements, CE mark, todylaboratories®, code C53MR1065-50