1887

Abstract

Rapid isolation and identification of pathogens is a major goal of diagnostic microbiology. In order to isolate and identify , a number of authors have used a variety of selective and/or differential culture media. However, to date, there are no reports comparing the efficacy of selective and differential culture media for isolation from bovine mastitis cases using the 16S rRNA () gene sequence as a gold standard test. In the present study, we evaluated the efficacy of four selective and/or differential culture media for the isolation of from milk samples collected from cows suffering from bovine mastitis. Four hundred and forty isolates were obtained using salt–mannitol agar (SMA, Bioxon), Staphylococcus-110 agar (S110, Bioxon), CHROMAgar Staph aureus (CSA, BD-BBL) and sheep’s blood agar (SBA, BD-BBL). All bacterial isolates were identified by their typical colony morphology in the respective media, by secondary tests (for coagulase and β-haemolysis) and by partial 16S rRNA () gene sequencing as a gold standard test. Sensitivity, positive predictive and negative predictive values were higher for SMA (86.96, 52.63 and 95.95 %, respectively) compared with S110 (70.00, 23.73 and 90.91 %, respectively), CSA (69.23, 28.13 and 95.74 %, respectively) and SBA (68.75, 37.93 and 89.58 %, respectively) while specificity values were similar for all media. Data indicated that the use of culture media for isolation combined with determination of coagulase activity and haemolysis as secondary tests improved accuracy of the identification and was in accordance with gene sequence-analysis compared with the use of the culture media alone.

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2013-03-01
2019-10-17
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