V Factor Discs are supplied by Micromaster. They are available in the form of filter paper discs with a diameter of 6mm bearing letters "V" in continuous printing style. It is advisable to store these discs between 2-8C for maximum efficiency.

Quantity provided: 50 discs/vial

V Factor Discs are used for the presumptive identification of Haemophilus species on the basis of their requirements for X or V factors or both. V-factor discs are the sterile filter paper discs impregnated with growth factor V which are used for differentiating Haemophilus species in conjunction of X factor & X+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.