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. 1988 Mar;26(3):540–543. doi: 10.1128/jcm.26.3.540-543.1988

Electrophoretic characterization of Clostridium difficile strains isolated from antibiotic-associated colitis and other conditions.

A Pantosti 1, M Cerquetti 1, P M Gianfrilli 1
PMCID: PMC266328  PMID: 3356792

Abstract

Clostridium difficile has been recognized as the cause of antibiotic-associated pseudomembranous colitis and of less severe diarrheal diseases associated with the use of antimicrobial agents. However, healthy carriers of this microorganism have been found, particularly healthy neonates and small children. Various typing systems have been used to clarify the epidemiology of C. difficile. We used the electrophoretic patterns of EDTA-extracted proteins to characterize C. difficile strains from various sources. Altogether, 110 strains were studied, including 2 reference strains, and 21 different protein profiles were obtained. However, two patterns were the most common: the group 2 pattern, characterized by a major 35-kilodalton polypeptide band, and the group 5 pattern, identified by principal bands of 37 and 56 kilodaltons. The group 2 pattern was characteristic of strains isolated during hospital outbreaks and from sporadic cases of pseudomembranous colitis and antibiotic-associated diarrhea. The group 5 pattern was obtained only from isolates from healthy neonates and children. A correlation between electrophoretic characteristics and virulence can be hypothesized, namely that group 2 strains are more prone to induce diseases and cause outbreaks. It is noteworthy that strains isolated from children with diarrhea of unknown etiology, not related to antibiotic use, belong to the "virulent" group 2; strains from leukemic patients showed a variety of different patterns, and only two belong to group 2. This characterization can be used to aid studies on the virulence and clinical significance of C. difficile.

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Selected References

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