Identification and classification of Campylobacter strains by using nonradioactive DNA probes

Acetylaminofluorene-labeled genomic DNA probes were used for the identification and classification of Campylobacter strains. Relationships among 17 well-known strains of Campylobacter species and subspecies were studied by comparing acetylaminofluorene- or 32P-labeled probes. Results obtained with both methods were closely correlated and were in agreement with those already reported. In an identification experiment, hybridization with nonradioactive probes was performed on 60 strains isolated from stool samples after subculturing and quick DNA extraction; conventional biochemical tests were conducted in parallel. A good correlation was found between the results obtained by nonradioactive hybridization and by biochemical tests. Thus, the acetylaminofluorene-labeled genomic DNA probe method is an interesting alternative for laboratories without access to radioisotopes for the identification and classification of bacteria.