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J Clin Microbiol. 1990 May; 28(5): 886-889

Laboratory observations on Plesiomonas shigelloides strains isolated from children with diarrhea in Peru.

O Olsvik, K Wachsmuth, B Kay, K A Birkness, A Yi and B Sack

Division of Bacterial Diseases, Center for Disease Control, Atlanta, Georgia 30333.

ABSTRACT

Eleven strains of Plesiomonas shigelloides isolated from 10 Peruvian children with diarrhea were examined. All the strains were resistant to two or more antibiotics, most commonly ampicillin, gentamicin, erythromycin, kanamycin, and streptomycin. The strains were all negative in the Sereny and cell culture assays used to test for enteroinvasiveness. One strain showed cytotoxic activity on Vero cells. The strains showed no antigenic relationship with Shigella organisms. Both bioassays and enzyme-linked immunosorbent assays used for detection of Escherichia coli enterotoxins were negative. Nucleic acid probes for such toxins likewise gave negative results. The strains all possessed a large (approximately 200-megadalton) plasmid in addition to one or more other plasmids. Several different plasmid profiles were observed among these 11 P. shigelloides strains, indicating that the isolates were not acquired from a common source or from a single bacterial clone.

J Clin Microbiol. 1990 May; 28(5): 886-889




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