VBC medium is a selective culture medium designed for isolating Haemophilus species, containing hemoglobin as a hemin (X factor) source and IsoVitaleX as a NAD (V factor) supplement. The antibiotic combination (vancomycin, bacitracin, clindamycin) selectively suppresses Gram-positive bacteria, Gram-negative organisms, and fungal contaminants while permitting Haemophilus growth.