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Correction published on 12 July 2021, see Microorganisms 2021, 9(7), 1482.
Article

Multiplex Detection of Salmonella spp., E. coli O157 and L. monocytogenes by qPCR Melt Curve Analysis in Spiked Infant Formula

1
Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
2
College of Pharmacy/School of Veterinary Sciences, University of Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain
*
Author to whom correspondence should be addressed.
Microorganisms 2020, 8(9), 1359; https://doi.org/10.3390/microorganisms8091359
Received: 12 August 2020 / Revised: 2 September 2020 / Accepted: 3 September 2020 / Published: 4 September 2020
(This article belongs to the Special Issue Rapid and Novel Diagnostics for Infectious Diseases)
Food poisoning continue to be a threat in the food industry showing a need to improve the detection of the pathogen responsible for the hospitalization cases and death. DNA-based techniques represent a real advantage and allow the detection of several targets at the same time, reducing cost and time of analysis. The development of new methodology using SYBR Green qPCR for the detection of L. monocytogenes, Salmonella spp. and E. coli O157 simultaneously was developed and a non-competitive internal amplification control (NC-IAC) was implemented to detect reaction inhibition. The formulation and supplementation of the enrichment medium was also optimized to allow the growth of all pathogens. The limit of detection (LoD) 95% obtained was <1 CFU/25 g for E. coli O157, and 2 CFU/25 g for Salmonella spp. and L. monocytogenes and regarding the multiplex detection a LoD 95% of 1.7 CFU/25 g was observed. The specificity, relative sensitivity and accuracy of full methodology were 100% and the use of the NC-IAC allowed the reliability of the results without interfering with the sensitivity of the methodology. The described study proved to obtain results comparable to those of probe-based qPCR, and more economically than classical high resolution melting qPCR, being both important aspects for its implementation in the food industry. View Full-Text
Keywords: multiplex qPCR; melting analysis; food analysis; Listeria monocytogenes; Salmonella spp.; E coli O157; non-competitive internal amplification control (NC-IAC) multiplex qPCR; melting analysis; food analysis; Listeria monocytogenes; Salmonella spp.; E coli O157; non-competitive internal amplification control (NC-IAC)
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MDPI and ACS Style

Azinheiro, S.; Carvalho, J.; Prado, M.; Garrido-Maestu, A. Multiplex Detection of Salmonella spp., E. coli O157 and L. monocytogenes by qPCR Melt Curve Analysis in Spiked Infant Formula. Microorganisms 2020, 8, 1359. https://doi.org/10.3390/microorganisms8091359

AMA Style

Azinheiro S, Carvalho J, Prado M, Garrido-Maestu A. Multiplex Detection of Salmonella spp., E. coli O157 and L. monocytogenes by qPCR Melt Curve Analysis in Spiked Infant Formula. Microorganisms. 2020; 8(9):1359. https://doi.org/10.3390/microorganisms8091359

Chicago/Turabian Style

Azinheiro, Sarah, Joana Carvalho, Marta Prado, and Alejandro Garrido-Maestu. 2020. "Multiplex Detection of Salmonella spp., E. coli O157 and L. monocytogenes by qPCR Melt Curve Analysis in Spiked Infant Formula" Microorganisms 8, no. 9: 1359. https://doi.org/10.3390/microorganisms8091359

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