Intra-species restriction fragment length polymorphisms (RFLPs) of were detected in assays with a cloned DNA fragment from that included the 16S and 23S rRNA genes. By use of this method it was possible to identify different RFLP types within biogroups/serogroups which were indistinguishable by other means. Thus the 37 biogroup IV/serogroup O3 strains isolated worldwide from pig carcasses, pork and human patients, were subdivided into five different RFLP-types. Typing based on RFLP analysis was sensitive and independent of phenotypic characters. The method will be of value for the identification and evaluation of possible reservoirs and routes of infection.


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