X+V Factor discs are supplied by Micromaster. They are available in the form of filter paper discs with a diameter of 6mm bearing letters "X+V" in continuous printing style. It is advisable to store these discs below -10C for maximum efficiency.

Quantity provided: 50 discs/vial

Both X and V factors are growth factors that are essential for certain organisms like Haemophilus species and also enhance growth of organisms like Neisseria species. X+V factor discs are the sterile filter paper discs impregnated with growth factors X and V which are used for differentiating Haemophilus species in conjunction of X factor & V factor discs. Bordetella and Haemophilus species can also be identified on the basis of the requirement of X and V growth factors in the basal medium. The X factor (hemin) and V factor (Coenzyme- Nicotinamide adenine dinucleotide NAD+) are impregnated on the sterile filter paper discs of diameter 6 mm. The test organism requiring X factor alone, grows only in the vicinities of X and X+V factor discs. Those which require V factor alone grow in the vicinities of V and X+V factor discs. If both X and V factors are required, then the organism will grow only in the vicinity of the X+V factor discs. This satellite growth is seen around the disc promoting growth.