Development and validation of a loop mediated isothermal amplification (LAMP) assay for the detection of Staphylococcus aureus in bovine mastitis milk samples

Mol Cell Probes. 2016 Oct;30(5):320-325. doi: 10.1016/j.mcp.2016.08.001. Epub 2016 Aug 2.

Abstract

Staphylococcus (S.) aureus is one of the most important animal pathogens causing bovine mastitis. Also, it is a major human pathogen that may produce a variety of toxins which cause staphylococcal food poisoning. In the present study a LAMP assay based on gene nuc to identify S. aureus was developed and validated. The specificity of the LAMP assay was confirmed by using 70 S. aureus isolates and 21 non-S. aureus strains. The optimal temperature-time combination to amplify gene nuc successfully was 65 °C and 30 min. The analytical sensitivity of the developed LAMP assay was 0.26 pg of S. aureus DNA per reaction. The limit of detection evaluated with milk spiked with S. aureus was 9 × 102 CFU mL-1. The final results of this assay were available within less than 2 h. The present study showed that the LAMP assay based on gene nuc appeared to be rapid and simple, and could also be used to identify S. aureus isolates from mastitis milk of dairy cows.

Keywords: Gene nuc and milk; LAMP; Staphylococcus aureus.

Publication types

  • Validation Study

MeSH terms

  • Animals
  • Cattle
  • Female
  • Genes, Bacterial
  • Limit of Detection
  • Mastitis, Bovine / microbiology*
  • Milk / microbiology*
  • Polymerase Chain Reaction / methods*
  • Predictive Value of Tests
  • Reference Standards
  • Sensitivity and Specificity
  • Staphylococcus aureus / genetics*
  • Staphylococcus aureus / isolation & purification*