CELLULAR FATTY ACID COMPOSITION OF HAEMOPHILUS SPECIES, PASTEURELLA MULTOCIDA, ACTINOBACILLUS ACTINOMYCETEMCOMITANS AND HAEMOPHILUS VAGINALIS (CORYNEBACTERIUM VAGINALE)

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Abstract
The fatty acid composition of 35 H. influenzae strains was grossly similar and characterized by relatively large amounts of 14:0, 3-OH-14:0, 16:1 and 16:0. The 3 C18 fatty acids 18:2, 18:1 and 18:0 were also present, but in much lower concentrations. This general pattern was also found for most of the other Haemophilus spp. examined (H. aegyptius, H. aphrophilus, H. canis, H. gallinarum, H. haemolyticus and H. parainfluenzae). Small but distinct quantitative discrepancies were detected for H. ducreyi and the hemin-independent species H. paraphrohaemolyticus, H. paraphrophilus and H. suis. A. actinomycetemocitans was indistinguishable from H. influenzae. P. multocida also exhibited a fatty acid pattern closely related to that of Haemophilus, but could be distinguished by its higher concentration levels of the C18 fatty acids. The fatty acid pattern of H. vaginalis was considerably different from those of the other species examined. This species lacked 3-OH-14:0 and 18:2 and contained small amounts of 14:0 and 16:0, while 18:1 and 18:0 were the major constituents.

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