- Small aerobic gram-negative coccobacillus found mainly in the respiratory tract.
- Fastidious organism, factors X (hemin, haemophilius from Latin "blood loving") and V (nicotinamide-adenine-dinucleotide) required for growth on chocolate agar, the preferred media
- Haemophilus influenzae: two categories causing human colonization or infection
- Other species: all are part of normal flora of human oral and pharyngeal cavities but may also be causes of bacterial respiratory tract infections and endocarditis, similar to H. influenzae.
- H. parainfluenzae (most common)
- H. aphrophilus
- H. paraphrophilus
- H. parahaemolyticus
- H. segnis a
- Note: H. aphrophilus and H. segnis are now classified to new genus: Aggregatibacter aphrophilus and Aggregatibacter segnis.
- H. ducreyi, agent of Chancroid, see separate module.
Haemophilus species was found in Johns Hopkins ABX Guide.
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