AUTHOR=Li Peng , Zhang Dingxiu , Li Hongmei , Pang Jinying , Guo Huijun , Qiu Jianhua 

TITLE=Establishment and Application of Multiplex PCR for Simultaneously Detecting Escherichia coli, Salmonella, Klebsiella pneumoniae, and Staphylococcus aureus in Minks

JOURNAL=Frontiers in Veterinary Science

VOLUME=7

YEAR=2020

URL=https://www.frontiersin.org/journals/veterinary-science/articles/10.3389/fvets.2020.588173

DOI=10.3389/fvets.2020.588173

ISSN=2297-1769

ABSTRACT=<p>To establish a multiplex PCR for simultaneous detection of <italic>Escherichia coli</italic> (<italic>E. coli</italic>), <italic>Salmonella, Klebsiella pneumoniae</italic> (<italic>K. pneumoniae</italic>), and <italic>Staphylococcus aureus</italic> (<italic>S. aureus</italic>), four pairs of specific primers were designed according to the conservative regions of <italic>phoA</italic> gene for <italic>E. coli, invA</italic> gene for <italic>Salmonella, khe</italic> gene for <italic>K. pneumoniae, nuc</italic> gene for <italic>S. aureus</italic>. The quadruple PCR system was established through optimization of multiplex PCR and detection of specificity, sensitivity, and stability. The results showed that target gene bands of <italic>E. coli</italic> (622 bp), <italic>Salmonella</italic> (801 bp), <italic>K. pneumoniae</italic> (303 bp), and <italic>S. aureus</italic> (464 bp) could be amplified by this method specifically and simultaneously from the same sample containing the four pathogens, with a detection sensitivity of 100 pg/μL. Meanwhile, no bands of common clinical bacteria, including <italic>Clostridium perfringens, Pseudomonas aeruginosa, Pasteurella multocida, Streptococcus pneumoniae, Streptococcus pneumoniae, Proteus mirabilis, Staphylococcus sciuri, Staphylococcus pseudintermedius, Acinetobacter baumannii, Enterococcus faecalis</italic>, and <italic>Bacillus subtilis</italic> were amplified. In addition, 380 tissue samples were detected by multiplex and single PCR established in current study, respectively. Among the 368 carcass samples, positive detection rates of <italic>E. coli, K. pneumoniae, Salmonella</italic>, and <italic>S. aureus</italic> were 33.7, 12.0, 10.6, and 13.9%. Among the 12 visceral tissue samples, positive detection rates of <italic>E. coli, K. pneumoniae, Salmonella</italic>, and <italic>S. aureus</italic> were 41.7, 25.0, 16.7, and 8.3%, respectively. Positive detection rates of multiplex PCR were consistent with that of single PCR. Compared with single PCR, the multiplex PCR method had the advantages of time-saving, high specificity and high sensitivity. The results showed that the minks in these farms had mixed infection of these four pathogens, and the method established in this study could be applied to the rapid and accurate detection and identification of these four bacteria. In conclusion, the multiplex PCR method has stable detection results, good repeatability, and short detection time. It is suitable for the rapid and accurate detection of four kinds of bacteria above the carcass of fur animals, which could be suitable in microbial epidemiology investigation. It can provide a reliable technical reference for rapid clinical diagnosis and detection.</p>