Member of the genus Haemophilus require hemin (X factor) and/or nicotinamid-adenin-dinucleotid (V-factor). Together with the X factor (Cat. No. 77148) and the V factor (Cat. No. 89788) the need for either one or both factors provides the main means of differentiation of these organisms. Haemophilus species requiring both X and V factors exhibit growth only in the vicinity of the X +V factor discs.
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Sterile filter paper discs (50 pcs, diameter 6 mm) impregnated with growth factors (hemin, nicotinamide adenine dinucleotide).
For microbiologists the most fundamental stain was developed in 1884 by the Danish bacteriologist Hans Christian Gram.
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