Chronic pneumonitis caused by Hemophilus influenzae in an adult.

Chronic pneumonitis due to Hemophilus influenzae developed in a 68-year-old woman. The unusual aspects of this manifestation and the patient's chest roentgenographic findings are discussed. Hemophilus influenzae was isolated from lung tissue obtained at an open lung biopsy. The isolate was sensitive to ampicillin sodium, and therapy resulted in clinical and roentgenographic resolution of the infection.