Bacteremic Superinfections of Patients with Bacteremia: Occurrence, Bacteriology, Mortality, and Duration of Hospitalization at Boston City Hospital during 12 Selected Years between 1935 and 1972

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Abstract
During the course of hospitalization of 6,414 patients with bacteremic infections identified at Boston City Hospital (Boston, Massachusetts) during 12 selected years between 1935 and 1972, 6.0% developed verified bacteremic superinfections with organisms not isolated or identified in the primary bacteremic infection. Analysis of these cases reemphasizes the increasing occurrence of serious hospital-acquired infections despite the successive introduction and intensive use of a large number of effective antibacterial agents. The bacteremic superinfections, like the primary hospital-acquired bacteremias, increased in incidence over the years, particularly since 1961; they were more frequent and were associated with a higher mortality rate and longer duration of hospital stay in the primary hospital-acquired cases than in the patients in whom bacteremia was considered to be community-acquired. The organisms in superinfections were similar to those in primary hospital-acquired bacteremias. Superinfection was more frequent among the patients who died than among the survivors.

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