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Haemophilus aegyptius (note spelling) causes an acute very contagious form of conjunctivitis which is also referred to as 'pink eye'. In terms of X and V factors, hemolysis on horse blood, fermentation of sugars, ONPG, and catalase reactions it reacts the same as H. influenzae. Differentiating H. influenzae from H. aegyptius by standard laboratory methods is not possible at this time. Many believe that on gram stain, H. aegyptius has a more slender distinctive rod shape than the pleomorphic (rod/cocci) shape seen with H. influenzae, but even this test is not perfect.
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