DIFFERENTIATION OF HAEMOPHILUS AEGYPTIUS AND HAEMOPHILUS INFLUENZAE

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Abstract
The relationship of H. aegyptius and H. influenzae isolated from acute conjunctivitis cases in Egypt was examined. Freshly isolated strains (29) selected form a large clinical material were examined for morphological and growth characteristics, biochemical properties and susceptibility to selected antibiotics. H. aegyptius strains were clearly differentiated from strains of H. influenzae by their inability to grow on tryptic soy agar containng X + V factors, by their susceptibility to trooleandomycin, by a distinct bacillary morphology and, in parts, by not fermenting xylose. The results confirm that H. aegyptius is distinct from H. influenzae and provide reproducible means of differentiating the 2 spp.