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Real-time PCR versus MALDI-TOF MS and culture-based techniques for diagnosis of bloodstream and pyogenic infections in humans and animals
Faculty
Veterinary Medicine
Year:
2020
Type of Publication:
ZU Hosted
Pages:
Authors:
Norhan Khayry Abdelaziz Mahmoud
Staff Zu Site
Abstract In Staff Site
Journal:
Journal of Applied Microbiology Wiley Online Library
Volume:
Keywords :
Real-time , versus MALDI-TOF , , culture-based techniques , diagnosis , bloodstream
Abstract:
Aims: This study was applied to evaluate the usefulness of a high-throughput sample preparation protocol prior to the application of quantitative real-time PCR (qPCR) for the early diagnosis of bloodstream and pyogenic infections in humans and animals compared to matrix-assisted laser desorption ionization–time of flight mass spectrometry (MALDI-TOF MS) and classical culture. Methods and Results: Saponin-mediated selective host cell lysis combined with DNase-1 was applied for processing of whole blood and pus clinical samples collected from suspected cases of septicaemia and pyogenic infections in humans and animals. The pre-PCR processing strategy enabled the recovery of microbial cells with no changes in their colony forming units immediately after the addition of saponin. DNase-1 was efficient for removing the DNAs from the host cells as well as dead cells with damaged cell membranes. The metagenomic qPCR and MALDI-TOF MS could identify the bacterial community of sepsis at species level with a concordance of 9737% unlike the conventional culture. According to qPCR results, Staphylococcus aureus (2424%) was predominated in animal pyogenic infections, whereas Klebsiella pneumonia (3181%) was commonly detected in neonatal sepsis. Conclusions: Saponin combined with DNase-1 allowed the efficient recovery of microbial DNA from blood and pus samples in sepsis using qPCR assay. Significance and Impact of the Study: Metagenomic qPCR could identify a broad range of bacteria directly from blood and pus with more sensitivity, higher discriminatory power and shorter turnaround time than those using MALDI-TOF MS and conventional culture. This might allow a timely administration of a prompt treatment.
Author Related Publications
Norhan Khayry Abdelaziz Mahmoud, "Mutations of domain V in 23S ribosomal RNA of macrolide-resistant Mycoplasma gallisepticum isolates in Egypt", Open Learning on Enteric Pathogens, 2016
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Norhan Khayry Abdelaziz Mahmoud, "Propidium Monoazide Quantitative Real-Time Polymerase Chain Reaction for Enumeration of Some Viable but Nonculturable Foodborne Bacteria in Meat and Meat Products", Mary Ann Liebert, Inc., 2018
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Norhan Khayry Abdelaziz Mahmoud, "Class 1 integron and associated gene cassettes mediating multiple-drug resistance in some food borne pathogens", Malaysia, 2016
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Norhan Khayry Abdelaziz Mahmoud, "حلقة نصاب الاستشعار الهرمى المعقد تنظم التعبير الجينى للفينازين فى السيدوموناس ايروجينوزا", The Journal of Infection in Developing Countries, 2016
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Norhan Khayry Abdelaziz Mahmoud, "تلازم محددات المقاومة للكينولون بواسطة البلازميد و AmpC بيتا لاكتاماز فى عترات الاشرشيا كولاى فى مصر", Cellular and Molecular Biology, 2016
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Department Related Publications
Ahlaam Abd Al Aziz Gharieb Ibrahim, "Association of Plasmid-Mediated Quinolone Resistance with AmpC- Beta-Lactamase Producing E. coli strains from Different Sources", Zagazig Univerisity, 2014
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Iman Ibrahim Attia Sweilem, "The presence of toxin genes of Clostridium perfringens isolated from camels and humans in Egypt. تواجد جينات السموم في المطثية الحاطمة المعزولة من الإبل والآدميين بمصر", كلية الطب البيطرى كرواتيا, 2010
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Iman Ibrahim Attia Sweilem, "Isolation of Staphylococcus aureus from milk and human with reference to its survival on surfaces. عزل المكور العنقودى الذهبى من الحليب والآدميين مع الإشارة لبقائها على الأسطح.", كلية الطب البيطرى - جامعة الزقازيق, 2013
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Lamia Mohammad Reza Mohammad Noman, "Studies on Antibiotic Resistance of Escherichia coli isolated from poultry and children", Sues Canal Vet. Med. J, accepted for publication (2013), 2013
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Lamia Mohammad Reza Mohammad Noman, "Bacteriological studies of Salmonella typhimurium isolated from cow calves and lambs", Assiut Vet. Med. J. Vol. 60 No. 140 January 2014, 2014
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