Affiliation:
1. Departamento de Biologı́a Funcional, Area Microbiologı́a, Facultad de Medicina, Universidad de Oviedo, 33006-Oviedo,1 and
2. Laboratorio de Salud Pública, Consejerı́a de Servicios Sociales del Principado de Asturias, 33011-Oviedo,2 Spain
Abstract
ABSTRACT
A series of 74
Yersinia enterocolitica
clinical strains collected in a Spanish region and 10 reference strains, assigned to nine serotypes and five biotypes, were analyzed by ribotyping procedures. Riboprobing, performed separately with
Hin
dIII and
Bgl
I and using an
rrn
operon as the probe, generated 13 and 11 ribotypes (discrimination index [DI] = 0.56 and 0.55), respectively. PCR ribotyping, performed with primers complementary to conserved regions of 16S and 23S rRNA genes, generated 13 ribotypes (DI = 0.56). A combination of data from the three procedures allowed for further discrimination into 17 combined ribotypes (DI = 0.83). The dendrogram obtained by cluster analysis of data from riboprobing indicated a high heterogeneity of the ribosomal DNA regions of the strains under study (similarities between 10 and 92%), which were grouped into three clusters at a similarity level of 0.32. The major cluster included 10 branches, and 7 of these formed a subcluster (similarity coefficient, >83%) represented by strains of serotype O:3 and biotype 2, 3, or 4. The second cluster included four branches, represented by strains belonging to seven non-O:3 serotypes, biotypes 1A and 2, and two of these branches included pyrazinamidase-positive as well as pyrazinamidase-negative strains. The remaining three branches, represented by O:3–biotype 4 strains, formed a third cluster weakly related to the others. Data from this study showed that
Y. enterocolitica
O:3 organisms assigned to a prevalent and endemic lineage and non-O:3 organisms assigned to three other less-frequent lineages are circulating and causing human disease in the Spanish region under study.
Publisher
American Society for Microbiology
Cited by
35 articles.
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