No significant difference was seen in the incidence of infections between subjects receiving complete, selective and no decontamination aimed at the intestinal microflora in studies evaluating the preventative potential against endogenous infections in the compromised host maintained under protective isolation. This finding is reported together with a report of Serratia marcescens septicemia in a patient with leukemia who was given antibiotics systemically and kept under protective isolation. The establishment of opportunistic infections in relation to these results is discussed in terms of the biological phenomena of the interaction between the intestinal flora and the host, and between the species comprising the intestinal flora.
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