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2011, Number 3

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Vet Mex 2011; 42 (3)

Penicillin G and oxacillin resistance in Staphylococcus aureus strains isolated from bovine subclinical mastitis

Zschöck M, El-Sayed A, Eissa N, Lämmler C, Castañeda-Vazquez H

Language: English/Spanish
References: 46
Page: 207-217
PDF size: 267.66 Kb.


ABSTRACT

Sixty-eigth out of 530 different S. aureus field strains isolated from subclinical cases of bovine mastitis from Germany (n = 26), Indonesia (n = 16), Mexico (n = 16) and Brazil (n = 10), respectively, were selected to be studied in the present work. The strains were tested phenotypically as well as genotypically for the presence of penicillin G- and oxacillin-resistance. For the primary phenotypical species identification of the 530 S. aureus strains, plasmacoagulase-test and Api 32 Staph system was applied. This was confirmed by molecular detection of the S. aureus specific genes encoding 23 S rRNA, thermostable nuclease (nuc), clumping factor (clfA), coagulase (coa) and protein A region Xr (spa). The selection of the 68 strains was carried out by the random selection of one strain per herd; additionally, only strains with different macrorestriction profiles were included here. Genotypic resistance to semisynthetic penicillins (methicillin/oxacillin) and penicillin G was studied through the identification of mecA- and blaZ-genes, respectively. ThemecA gene was detected in only one S. aureus isolate from Brazil, which was not phenotypically resistant against methcillin, as shown by the use of standard disc diffusion method, BBL-Chromoagar and MIC-determination by Vitek II. In contrast penicillin-resistance of strains based on the presence of the blaZ-gene could be observed in 50 (73.5%) of the investigated strains. However, only 40 (58.8%) of these 50 blaZ-positive strains were phenotypically penicillin-resistant. According to the presented data, resistance to semisynthetic penicillins in S. aureus field strains seems to be not a major problem in dairy herds of the investigated countries despite the long-term use of these antibiotics in the field.


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