Hemophilus influenzae type F pneumonia in adults.

A 69-year-old man was hospitalized with fatal bacteremic Hemophilus influenzae type F pneumonia. Three cases of type F pneumonia have been reported previously. When compared with 22 reported cases of bacteremic type B pneumonia, patients with type F infection were more likely to be elderly males who succumbed to their infection (p less than 0.05). Statistically significant differences in the incidence of underlying conditions or in the extent of pneumonia were not present.