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We have applied the technique of lipopolysaccharide (LPS) profiling in sodium dodecyl sulfate-polyacrylamide gel electrophoresis to the typing of 124 isolates of 12 gram-negative species from suspected outbreaks of infection. LPS was prepared by proteinase K digestion or micro-phenol-water extraction. A total of 11 of the 12 species gave clear ladder band profiles, the exception being Acinetobacter baumannii. When compared with conventional typing for Enterobacter cloacae, Pseudomonas aeruginosa, and Serratia marcescens, LPS profile type alone was sufficient to allow relatedness or distinguishability of isolates to be established, and this was corroborated by serotype and phage type data. Serologically nontypeable isolates invariably lacked O repeating units and thus could not be classified by their silver stain profile. We conclude that LPS profiling is useful for the epidemiological investigation of small clusters of isolates in order to determine whether or not cross-infection between patients has occurred.

Lipopolysaccharide profile typing as a technique for comparative typing of gram-negative bacteria