Abstract
Genetic relationships of Aeromonas veronii strains isolated from human and environmental sources were investigated by restriction fragment length polymorphism (RFLP) of the polymerase chain reaction-amplified intergenic spacer region (ISR) flanked by the 16S and 23S rRNA genes. When using endonucleases AluI, HinfI and CfoI the 16S-23S rDNA-RFLP patterns showed considerable overall similarity, although most strains yielded specific profiles. Several intra-specific lines of descent comprised clinical strains linked to isolates from environmental sources. Strains having identical patterns may be individuals derived from highly similar, if not the same, microorganism. Results suggest that the ISR sequence-based method can be used to demonstrate colonization of a public water supply with a particular microorganism. In addition it could be very useful for tracing recurrent episodes of diarrhea and Aeromonas infection outbreaks.
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