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Haemophilus influenzae Haemophilus in·flu·en·zae (ĭn'flōō-ěn'zē)
A gram-negative, rod-shaped bacterium of the genus Haemophilus that occurs in the human respiratory tract and causes acute respiratory infections, acute conjunctivitis, and purulent meningitis; type b is the most common pathogenic form of the bacterium. Also called Pfeiffer's bacillus.