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Occurrence of the blaZ Gene in Penicillin Resistant Staphylococcus aureus Isolated from Bovine Mastitis in Denmark

Forekomst af blaZ genet i penicillinresistente Staphylococcus aureus isoleret fra bovin mastitis i Danmark

Abstract

Fifty-eight penicillin resistant Staphylococcus aureus isolates of known phage types from bovine mastitis in Denmark from the 1950’ties (10 isolates) and the 1990’ties (48 isolates) were tested for beta-lactamase production. Furthermore, the presence of blaZ and blaR1 and the location of blaZ was determined by PCR and hybridisation. All isolates produced beta-lactamase and contained blaZ and blaR1. The blaZ gene was located on the chromosome in 54 isolates and on plasmids of different sizes in 4 isolates. Sequence analysis of an internal region of blaZ in 2 isolates of bovine origin showed a high degree of homology to already published sequences from human isolates. BlaZ could be transferred from the 4 isolates with plasmid location whereas it was not possible to transfer blaZ from 3 isolates with chromosomal location of the gene. The blaZ gene and the blaR1 gene were located closely to each other as previously published. In contrast to observations among isolates of human origin, no correlation between penicillin resistance and phage pattern was indicated for the bovine isolates. Furthermore, in contrast to the observed shift towards increased occurrence of plasmid location of blaZ among isolates of human origin in Denmark, blaZ appears to remain predominately chromosomal located among isolates of bovine origin.

Sammendrag

Otteoghalvtreds penicillinresistente Staphylococcus aureus isolater med kendte fagtyper fra mastitis hos kvæg, som var isoleret i 1950erne (10 isolater) og 1990erne (48 isolater), blev undersøgt for beta-laktamaseproduktion, forekomst af blaZ og blaR1, samt lokalisering af blaZ. Alle isolater producerede betalaktamase og indeholdt blaZ og blaR1. BlaZ genet var placeret på kromosomet i 54 isolater og på plasmider af forskellig størrelse i 4 isolater. Sekventering af en del af blaZ i 2 isolater viste en høj grad af homologi til de publicerede sekvenser fra humane stammer. BlaZ kunne overføres til en følsom S. aureus stamme fra de 4 isolater, hvor blaZ var placeret på plasmider, mens det ikke var muligt at overføre blaZ fra 3 isolater med kromosomal placering. BlaZ og blaR1 generne var placeret nær hinanden som tidligere beskrevet. Det var ikke muligt at observere nogen korrelation mellem fagtype og penicillinresistens, hvilket er i modsætning til det, der tidligere er blevet rapporteret for humane stammer. BlaZ er tilsyneladende stadig primært kromosomalt placeret blandt danske bovine stammer, hvilket er i modsætning til situationen blandt humane isolater, hvor der er sket et skift mod en øget forekomst af plasmidmedieret betalaktamase produktion.

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Correspondence to E. Møller Aarestrup.

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Vesterholm-Nielsen, M., Ølholm Larsen, M., Elmerdahl Olsen, J. et al. Occurrence of the blaZ Gene in Penicillin Resistant Staphylococcus aureus Isolated from Bovine Mastitis in Denmark. Acta Vet Scand 40, 279–286 (1999). https://doi.org/10.1186/BF03547026

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  • DOI: https://doi.org/10.1186/BF03547026