═════════════════╤═════════════════╤═════════════════╤═════════════════ AUTOPSY │ BLOOD │ LUNG │ BRONCHUS ─────────────────┼─────────────────┼─────────────────┼───────────────── 283 │Pneum. IV │Staph., B. inf. │B. inf., Pneum. │ │ │ IV, staph. 291 │0 │0 │B. inf., staph. 398 │0 │ │ 419 │0 │Pneum. II, B. │Pneum. II, B. │ │ inf. │ inf. 421 │S. hem. │Pneum. IV, S. │ │ │ hem. │ 422 │0 │Pneum. II atyp., │ │ │ B. inf. │ 425 │S. hem. │S. hem., B. inf.,│ │ │ S. alb. │ 433 │0 │S. hem., B. inf.,│ │ │ S. aur. │ 460 │S. hem. │S. hem., B. inf. │S. hem., B. inf., │ │ │ staph. 463 │0 │B. inf., staph. │B. inf., staph., │ │ │ Pneum. IV ─────────────────┴─────────────────┴─────────────────┴───────────────── B. influenzæ has been present in the bronchi in every instance save one in which cultures have been made, and it is probable that in this exceptional instance cultures have remained sterile because the media employed have been defective. The incidence of B. influenzæ in the lung has been unusually high both with and without organization (66.7 per cent with no organization; 77.8 per cent with organization). Streptococci and staphylococci have been found in a considerable proportion of all instances of peribronchial fibrinous pneumonia, but there has been no notable preponderance of these microorganisms when organization has occurred. Organization has been present in instances in which pneumonia is referable to pneumococcus associated with B. influenzæ and unaccompanied by either streptococci or staphylococci (Autopsies 419 and 422). Wadsworth[81] found no organization after inoculation of the lungs of dogs with pneumococcus or with staphylococcus alone, but produced organization when he inoculated animals with both microorganisms. Injury to bronchi produced in part at least by B. influenzæ exposes the bronchi and lung tissue to repeated infection with a variety of microorganisms; absorption of fibrin and regeneration of alveolar epithelium are prevented, resolution fails to occur and organization of fibrin follows. Suppurative Pneumonia With Necrosis and Abscess Formation Three varieties of suppurative pneumonia have occurred in association with influenza.