Acute pulmonary hemorrhage among infants--Chicago, April 1992-November 1994.

A cluster of cases of acute pulmonary hemorrhage of unknown etiology occurred among eight infants in Cleveland during January 1993-November 1994 (1). During the investigation of these cases, a similar cluster was identified in the Chicago area. From April 1992 through November 1994, seven infants with acute pulmonary hemorrhage of unknown etiology were admitted to hospitals in the Chicago area. Four of the infants were treated at the same hospital in which, during the preceding 3 years (1989-1991), one case of pulmonary hemorrhage among infants had been diagnosed. This report summarizes the preliminary results of the ongoing epidemiologic, clinical, and laboratory investigations of these cases by pediatric pulmonologists in Chicago, the Illinois Department of Public Health, the Chicago Department of Public Health, the Cook County Department of Public Health, and CDC.