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Ji T, Zhang J, Gao Y, Zhao C, Gao X. A rapid and visual detection of Staphylococcus haemolyticus in clinical specimens with RPA-LFS. Anal Chim Acta 2023; 1273:341534. [PMID: 37423664 DOI: 10.1016/j.aca.2023.341534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/29/2023] [Accepted: 06/14/2023] [Indexed: 07/11/2023]
Abstract
Staphylococcus haemolyticus (S. haemolyticus), which is highly prevent in the hospital environment, is an etiological factor for nosocomial infections. Point-of-care rapid testing (POCT) of S. haemolyticus is not possible with the currently used detection methods. Recombinase polymerase amplification (RPA) is a novel isothermal amplification technology with high sensitivity and specificity. The combination of RPA and lateral flow strips (LFS) can achieve rapid pathogen detection, enabling POCT. This study developed an RPA-LFS methodology using a specific probe/primer pair to identify S. haemolyticus. A basic RPA reaction was performed to screen the specific primer from 6 primer pairs targeting mvaA gene. The optimal primer pair was selected based on agarose gel electrophoresis, and the probe was designed. To eliminate false-positive results caused by the byproducts, base mismatches were introduced in the primer/probe pair. The improved primer/probe pair could specifically identify the target sequence. To explore the optimal reaction conditions, the effects of reaction temperature and duration of the RPA-LFS method were systematically investigated. The improved system enabled optimal amplification at 37 °C for 8 min, and the results were visualized within 1 min. The S. haemolyticus detection sensitivity of the RPA-LFS method, whose performance was unaffected by contamination with other genomes, was 0.147 CFU/reaction. Furthermore, we analyzed 95 random clinical samples with RPA-LFS, quantitative polymerase chain reaction (qPCR), and traditional bacterial-culture assays and found that the RPA-LFS had 100% and 98.73% compliance rates with the qPCR and traditional culture method, respectively, which confirms its clinical applicability. In this study, we designed an improved RPA-LFS assay based on the specific probe/primer pair for the detection of S. haemolyticus via rapid POCT, free from the limitations of the precision instruments, helping to make diagnoses and treatment decisions as soon as possible.
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Affiliation(s)
- Tuo Ji
- Department of Central Laboratory, Lianyungang Hospital Affiliated to Jiangsu University, Lianyungang, China; Department of Central Laboratory, The Second People's Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China; Department of Central Laboratory, Lianyungang Hospital Affiliated to Xuzhou Medical University, Lianyungang, China
| | - Junlong Zhang
- Department of Central Laboratory, Lianyungang Hospital Affiliated to Jiangsu University, Lianyungang, China; Department of Central Laboratory, The Second People's Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China; Department of Central Laboratory, Lianyungang Hospital Affiliated to Xuzhou Medical University, Lianyungang, China
| | - Yuzhi Gao
- Department of Central Laboratory, Lianyungang Hospital Affiliated to Jiangsu University, Lianyungang, China; Department of Central Laboratory, The Second People's Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China; Department of Central Laboratory, Lianyungang Hospital Affiliated to Xuzhou Medical University, Lianyungang, China
| | - Cheng Zhao
- Department of Central Laboratory, Lianyungang Hospital Affiliated to Jiangsu University, Lianyungang, China; Department of Central Laboratory, The Second People's Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China; Department of Central Laboratory, Lianyungang Hospital Affiliated to Xuzhou Medical University, Lianyungang, China.
| | - Xuzhu Gao
- Department of Central Laboratory, Lianyungang Hospital Affiliated to Jiangsu University, Lianyungang, China; Department of Central Laboratory, The Second People's Hospital of Lianyungang City (Cancer Hospital of Lianyungang), Lianyungang, China; Department of Central Laboratory, Lianyungang Hospital Affiliated to Xuzhou Medical University, Lianyungang, China.
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Khanal M, Joshi PR, Paudel S, Acharya M, Rijal KR, Ghimire P, Banjara MR. Methicillin-Resistant Coagulase Negative Staphylococci and Their Antibiotic Susceptibility Pattern from Healthy Dogs and Their Owners from Kathmandu Valley. Trop Med Infect Dis 2021; 6:tropicalmed6040194. [PMID: 34842844 PMCID: PMC8628895 DOI: 10.3390/tropicalmed6040194] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/02/2021] [Accepted: 10/05/2021] [Indexed: 11/16/2022] Open
Abstract
This cross-sectional study was designed to identify information on the frequency, antimicrobial resistance and species diversity of methicillin-resistant coagulase negative staphylococci (MRCoNS) among pet dogs and humans within households. Fifty five nasal swabs each from dogs and their owners were collected. MRCoNS were identified based on gram staining, culture on mannitol salt agar, biochemical tests, and mecA gene amplification. The antibiotic susceptibility of the isolates was assessed by a disc diffusion test. Uniplex and multiplex polymerase chain reaction (PCR) were employed for the species identification of MRCoNS and SCCmec typing, respectively. Species were further confirmed by MALDI-TOF-MS. The prevalence of MRCoNS was 29% in dog owners and 23.6% in dogs. Four different species of MRCoNS, Staphylococci saprophyticus (48.3%), S. haemolyticus (24.1%), S. warneri (17.2%), and S. epidermidis (10.3%), were detected. Two isolates each from dog owners and dogs showed a constitutive resistance to macrolide-lincosamide-streptogramin B (cMLSB) resistance, eight isolates each from dogs and their owners showed a macrolide-streptogramin B (MSB) resistance, and only two isolates from dog owners revealed an inducible resistance to macrolide-lincosamide-streptogramin B (iMLSB) resistance. SCCmec types were SCCmec type IV (55.2%), SCCmec type V (24.1%), SCCmec III (10.3%), SCCmec II (3.4%); two isolates were non-typable. MRCoNS are prevalent and genetically diverse in companion animals and humans. Different species of MRCoNS were found in dogs and their owners.
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Affiliation(s)
- Muna Khanal
- Central Department of Microbiology, Tribhuvan University, Kirtipur, Kathmandu 44618, Nepal; (M.K.); (K.R.R.); (P.G.)
| | - Prabhu Raj Joshi
- Nepalese Farming Institute, Maitidevi, Kathmandu 44605, Nepal; (P.R.J.); (S.P.); (M.A.)
| | - Saroj Paudel
- Nepalese Farming Institute, Maitidevi, Kathmandu 44605, Nepal; (P.R.J.); (S.P.); (M.A.)
| | - Mahesh Acharya
- Nepalese Farming Institute, Maitidevi, Kathmandu 44605, Nepal; (P.R.J.); (S.P.); (M.A.)
| | - Komal Raj Rijal
- Central Department of Microbiology, Tribhuvan University, Kirtipur, Kathmandu 44618, Nepal; (M.K.); (K.R.R.); (P.G.)
| | - Prakash Ghimire
- Central Department of Microbiology, Tribhuvan University, Kirtipur, Kathmandu 44618, Nepal; (M.K.); (K.R.R.); (P.G.)
| | - Megha Raj Banjara
- Central Department of Microbiology, Tribhuvan University, Kirtipur, Kathmandu 44618, Nepal; (M.K.); (K.R.R.); (P.G.)
- Correspondence:
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Seng R, Kitti T, Thummeepak R, Kongthai P, Leungtongkam U, Wannalerdsakun S, Sitthisak S. Biofilm formation of methicillin-resistant coagulase negative staphylococci (MR-CoNS) isolated from community and hospital environments. PLoS One 2017; 12:e0184172. [PMID: 28859149 PMCID: PMC5578677 DOI: 10.1371/journal.pone.0184172] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 08/15/2017] [Indexed: 01/31/2023] Open
Abstract
Methicillin-resistant coagulase negative staphylococci (MR-CoNS) are the major cause of infectious diseases because of their potential ability to form biofilm and colonize the community or hospital environments. This study was designed to investigate the biofilm producing ability, and the presence of mecA, icaAD, bap and fnbA genes in MR-CoNS isolates. The MR-CoNS used in this study were isolated from various samples of community environment and five wards of hospital environments, using mannitol salt agar (MSA) supplemented with 4 μg/ml of oxacillin. The specie level of Staphylococcus haemolyticus, Staphylococcus epidermidis, Staphylococcus hominis and Staphylococcus warneri was identified by specific primers of groESL (S. haemolyticus), rdr (S. epidermidis) and nuc (S. hominis and S. warneri). The remainder isolates were identified by tuf gene sequencing. Biofilm production was determined using Congo red agar (CRA) and Microtiter plate (MTP) assay. The mecA and biofilm associated genes (icaAD, fnbA and bap) were detected using PCR method. From the 558 samples from community and hospital environments, 292 MR-CoNS were isolated (41 from community environments, and 251 from hospital environments). S. haemolyticus (41.1%) and S. epidermidis (30.1%) were the predominant species in this study. Biofilm production was detected in 265 (90.7%) isolates by CRA, and 260 (88.6%) isolates were detected by MTP assay. The staphylococci isolates derived from hospital environments were more associated with biofilm production than the community-derived isolates. Overall, the icaAD and bap genes were detected in 74 (29.5%) and 14 (5.6%) of all isolates from hospital environments. When tested by MTP, the icaAD gene from hospital environment isolates was associated with biofilm biomass. No association was found between bap gene and biofilm formation. The MR-CoNS isolates obtained from community environments did not harbor the icaAD and bap genes. Conversely, fnbA gene presented in MR-CoNS isolated from both community and hospital environments. The high prevalence of biofilm producing MR-CoNS strains demonstrated in this study indicates the persisting ability in environments, and is useful in developing prevention strategies countering the spread of MR-CoNS.
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Affiliation(s)
- Rathanin Seng
- Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
| | - Thawatchai Kitti
- Faculty of Oriental Medicine, Chiang Rai College, Chiang Rai, Thailand
| | - Rapee Thummeepak
- Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
| | - Phattaraporn Kongthai
- Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
| | - Udomluk Leungtongkam
- Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
| | - Surat Wannalerdsakun
- Department of Medicine, Division of Infectious Diseases, Faculty of Medicine, Naresuan University, Phitsanulok, Thailand
| | - Sutthirat Sitthisak
- Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
- Centre of Excellence in Medical Biotechnology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
- * E-mail:
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Paiva-Santos WD, Barros EM, Sousa VSD, Laport MS, Giambiagi-deMarval M. Identification of coagulase-negative Staphylococcus saprophyticus by polymerase chain reaction based on the heat-shock repressor encoding hrcA gene. Diagn Microbiol Infect Dis 2016; 86:253-256. [PMID: 27601383 DOI: 10.1016/j.diagmicrobio.2016.08.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 07/07/2016] [Accepted: 08/08/2016] [Indexed: 11/26/2022]
Abstract
Staphylococcus saprophyticus is an uropathogen belonging to the human microbiota and is responsible for community-acquired infections of the urinary tract. Identification of Staphylococcus species by biochemical tests is laborious and costly when compared to routine laboratory tests. Because of their high sensitivity and specificity, molecular methods are better suited for accurate identification of Staphylococcusspp. Therefore, the goal of this work was to standardize a polymerase chain reaction (PCR) protocol using species-specific primers, based on the heat-shock repressor coding hrcA gene, for the identification of S.saprophyticus. A total of 142 S. saprophyticus strains were obtained from different sources, including clinical, environmental, and foodborne strains. We also included 98 strains of Staphylococcus spp. to further validate the proposed method. Reliable results for the detection of S. saprophyticus isolates were obtained for 100% of the strains evaluated. The results were in accordance with matrix-assisted laser desorption ionization-time of flight mass spectrometry identification, thus highlighting the applicability of species-specific PCR for the molecular identification of S. saprophyticus.
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Affiliation(s)
- Weslley de Paiva-Santos
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde (CCS), Av. Carlos Chagas Filho, 373, Bloco I, Cidade Universitária, 21941-920Rio de Janeiro, RJ, Brazil
| | - Elaine M Barros
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde (CCS), Av. Carlos Chagas Filho, 373, Bloco I, Cidade Universitária, 21941-920Rio de Janeiro, RJ, Brazil
| | - Viviane Santos de Sousa
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde (CCS), Av. Carlos Chagas Filho, 373, Bloco I, Cidade Universitária, 21941-920Rio de Janeiro, RJ, Brazil
| | - Marinella Silva Laport
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde (CCS), Av. Carlos Chagas Filho, 373, Bloco I, Cidade Universitária, 21941-920Rio de Janeiro, RJ, Brazil
| | - Marcia Giambiagi-deMarval
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde (CCS), Av. Carlos Chagas Filho, 373, Bloco I, Cidade Universitária, 21941-920Rio de Janeiro, RJ, Brazil.
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5
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Schmidt T, Kock MM, Ehlers MM. Diversity and antimicrobial susceptibility profiling of staphylococci isolated from bovine mastitis cases and close human contacts. J Dairy Sci 2015; 98:6256-69. [PMID: 26188567 DOI: 10.3168/jds.2015-9715] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Accepted: 06/08/2015] [Indexed: 11/19/2022]
Abstract
The objectives of this study were to examine the diversity of Staphylococcus spp. recovered from bovine intramammary infections and humans working in close contact with the animals and to evaluate the susceptibility of the staphylococcal isolates to different antimicrobials. A total of 3,387 milk samples and 79 human nasal swabs were collected from 13 sampling sites in the KwaZulu-Natal province of South Africa. In total, 146 Staph. aureus isolates and 102 coagulase-negative staphylococci (CNS) were recovered from clinical and subclinical milk samples. Staphylococcusaureus was isolated from 12 (15.2%) of the human nasal swabs and 95 representative CNS were recovered for further characterization. The CNS were identified using multiplex-PCR assays, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), and tuf gene sequencing. Seven Staphylococcus spp. were identified among the CNS of bovine origin, with Staph.chromogenes (78.4%) predominating. The predominant CNS species recovered from the human nasal swabs was Staph.epidermidis (80%) followed by Staph.chromogenes (6.3%). The antimicrobial susceptibility of all staphylococcal isolates was evaluated using disk diffusion and was supplemented by screening for specific antimicrobial resistance genes. Ninety-eight (67.1%) Staph.aureus isolates of bovine origin were pansusceptible; 39 (26.7%) isolates were resistant to a single class, and 7 (4.8%) isolates were resistant to 2 classes of antimicrobials. Two Staph. aureus (1.4%) isolates were multidrug-resistant. Resistance to penicillin was common, with 28.8% of the bovine and 75% of the human Staph. aureus isolates exhibiting resistance. A similar observation was made with the CNS, where 37.3% of the bovine and 89.5% of the human isolates were resistant to penicillin. Multidrug-resistance was common among the human CNS, with 39% of the isolates exhibiting resistance to 3 or more classes of antimicrobials. The antimicrobial susceptibility results suggest that resistance among staphylococci causing bovine intramammary infections in South Africa is uncommon and not a significant cause for concern. In contrast, antimicrobial resistance was frequently observed in staphylococcal isolates of human origin, highlighting a possible reservoir of resistance genes. Continued monitoring of staphylococcal isolates is warranted to monitor changes in the susceptibility of isolates to different classes of antimicrobials.
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Affiliation(s)
- T Schmidt
- Department of Medical Microbiology, University of Pretoria, Pretoria 0001, South Africa; Allerton Provincial Veterinary Laboratory, KwaZulu-Natal Department of Agriculture and Rural Development, Cascades 3202, South Africa.
| | - M M Kock
- Department of Medical Microbiology, University of Pretoria, Pretoria 0001, South Africa; Tshwane Academic Division, National Health Laboratory Service, Pretoria 0001, South Africa
| | - M M Ehlers
- Department of Medical Microbiology, University of Pretoria, Pretoria 0001, South Africa; Tshwane Academic Division, National Health Laboratory Service, Pretoria 0001, South Africa
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Chandrashekhar KM, Isloor S, Veeresh BH, Hegde R, Rathnamma D, Murag S, Veeregowda BM, Upendra HA, Hegde NR. Limit of detection of genomic DNA by conventional PCR for estimating the load of Staphylococcus aureus and Escherichia coli associated with bovine mastitis. Folia Microbiol (Praha) 2015; 60:465-72. [PMID: 25773783 DOI: 10.1007/s12223-015-0384-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 03/02/2015] [Indexed: 01/15/2023]
Abstract
Detection of mastitis-associated bacteria can be accomplished by culturing or by molecular techniques. On the other hand, rapid and inexpensive methods to enumerate bacterial load without culturing can be better achieved by molecular methods. Staphylococcus aureus and Escherichia coli are the predominant bacterial pathogens associated with bovine mastitis. Here, we describe the application of conventional PCR for the limit of detection (LOD) of genomic DNA of S. aureus and E. coli based on single-copy genes. The selected genes were thermonuclease (nuc), aureolysin (aur), and staphopain A (scpA) for S. aureus and β-D-glucuronidase A (uidA), cytochrome d oxidase (cyd), and rodA (a gene affecting cell shape and methicillin sensitivity) for E. coli. The LOD was 5.3, 15.9, and 143 pg for aur, nuc, and scpA genes, corresponding to S. aureus genomic copies of 1.75 × 10(3), 5.16 × 10(3), and 4.71 × 10(4), respectively. The LOD was 0.45, 12.3 and 109 pg for uidA, rodA and cyd genes, corresponding to E. coli genome copies of 8.91 × 10(1), 2.43 × 10(3), and 2.16 × 10(4), respectively. Application of uidA and aur PCRs to field strains revealed that as low as approximately 100 genome copies of E. coli and 1000-10,000 copies of S. aureus could be detected. This study is the first to report LOD of genomic DNA using conventional PCR for aur and scpA genes of S. aureus, and rodA and cyd genes of E. coli. The results should be useful for developing assays to assess bacterial load in milk and to determine the load that contributes to subclinical or clinical mastitis.
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Affiliation(s)
- K M Chandrashekhar
- Department of Microbiology, Karnataka Veterinary Animal and Fisheries Sciences University, Hebbal, Bengaluru, 560024, India
| | - Shrikrishna Isloor
- Department of Microbiology, Karnataka Veterinary Animal and Fisheries Sciences University, Hebbal, Bengaluru, 560024, India
| | - B H Veeresh
- Department of Microbiology, Karnataka Veterinary Animal and Fisheries Sciences University, Hebbal, Bengaluru, 560024, India
| | - Raveendra Hegde
- Institute of Animal Health and Veterinary Biologicals, Karnataka Veterinary Animal and Fisheries Sciences University, Hebbal, Bengaluru, 560024, India
| | - D Rathnamma
- Department of Microbiology, Karnataka Veterinary Animal and Fisheries Sciences University, Hebbal, Bengaluru, 560024, India
| | - Shivaraj Murag
- Institute of Animal Health and Veterinary Biologicals, Karnataka Veterinary Animal and Fisheries Sciences University, Hebbal, Bengaluru, 560024, India
| | - B M Veeregowda
- Department of Microbiology, Karnataka Veterinary Animal and Fisheries Sciences University, Hebbal, Bengaluru, 560024, India
| | - H A Upendra
- Institute of Wildlife Veterinary Research, Kudige, Kodagu, 571232, India
| | - Nagendra R Hegde
- Ella Foundation, Genome Valley, Turkapally, Shameerpet Mandal, Hyderabad, 500078, India.
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Bukowski M, Polakowska K, Ilczyszyn WM, Sitarska A, Nytko K, Kosecka M, Miedzobrodzki J, Dubin A, Wladyka B. Species determination within Staphylococcus genus by extended PCR-restriction fragment length polymorphism of saoC gene. FEMS Microbiol Lett 2014; 362:1-11. [PMID: 25790489 DOI: 10.1093/femsle/fnu007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Genetic methods based on PCR-restriction fragment length polymorphism (RFLP) are widely used for microbial species determination. In this study, we present the application of saoC gene as an effective tool for species determination and within-species diversity analysis for Staphylococcus genus. The unique sequence diversity of saoC allows us to apply four restriction enzymes to obtain RFLP patterns, which appear highly distinctive even among closely related species as well as atypical isolates of environmental origin. Such patterns were successfully obtained for 26 species belonging to Staphylococcus genus. What is more, tracing polymorphisms detected by different restriction enzymes allowed for basic phylogeny analysis for Staphylococcus aureus, which is potentially applicable for other staphylococcal species.
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Affiliation(s)
- Michal Bukowski
- Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 7 Gronostajowa St, 30-387 Krakow, Poland
| | - Klaudia Polakowska
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 7 Gronostajowa St, 30-387 Krakow, Poland
| | - Weronika M Ilczyszyn
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 7 Gronostajowa St, 30-387 Krakow, Poland
| | - Agnieszka Sitarska
- Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 7 Gronostajowa St, 30-387 Krakow, Poland
| | - Kinga Nytko
- Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 7 Gronostajowa St, 30-387 Krakow, Poland
| | - Maja Kosecka
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 7 Gronostajowa St, 30-387 Krakow, Poland
| | - Jacek Miedzobrodzki
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 7 Gronostajowa St, 30-387 Krakow, Poland
| | - Adam Dubin
- Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 7 Gronostajowa St, 30-387 Krakow, Poland
| | - Benedykt Wladyka
- Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 7 Gronostajowa St, 30-387 Krakow, Poland Malopolska Centre of Biotechnology, Jagiellonian University, 7 Gronostajowa St, 30-387 Krakow, Poland
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8
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Tsen HY, Shih CM, Teng PH, Chen HY, Lin CW, Chiou CS, Wang HTT, Chang HFG, Chung TY, Lee PY, Chiang YC. Detection of Salmonella in chicken meat by insulated isothermal PCR. J Food Prot 2013; 76:1322-9. [PMID: 23905786 DOI: 10.4315/0362-028x.jfp-12-553] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Consumption of Salmonella-contaminated foods, such as poultry and fresh eggs, is known to be one of the main causes of salmonellosis. Conventional PCR methods, including real-time PCR for rapid detection of Salmonella, in general require skilled technicians and costly instruments. A recently developed novel convective PCR, insulated isothermal PCR (iiPCR), is carried out in polycarbonate capillary tubes. In this study, we designed TaqMan probes and PCR primers based on the yrfH gene encoding a heat shock protein for the iiPCR detection of Salmonella in chicken meat samples. The TaqMan probe was labeled with 6-carboxyfluorescein and 6-carboxytetramethylrhodamine at the 5' and 3' ends, respectively. The PCR amplicon was 133 bp. A typical run of this iiPCR assay was completed within 1 h. Specific PCR products were obtained for 148 strains representing 49 serotypes of Salmonella tested. Under the same conditions, false-positive results were not obtained for 98 non-Salmonella strains tested, including strains of Enterobacteriaceae closely related to Salmonella. For chicken meat samples, with a 5-h enrichment step Salmonella at as low as 10⁰ CFU/g of poultry meat could be detected. Because the amplification signals from the probes are detectable at 520 nm, identification of the PCR products by gel electrophoresis is not required. Compared with conventional PCR, the iiPCR system requires less expertise and provides an economical, reliable, and rapid tool for result interpretation. Detection results can be obtained within 8 h, including the enrichment and DNA extraction steps.
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Affiliation(s)
- Hau-Yang Tsen
- Department of Food Science and Technology, Hung Kuang University, No. 1018, Sec. 6, Taiwan Boulevard, Shalu District, Taichung City 43302, Taiwan, Republic of China
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Sunagar R, Deore S, Deshpande P, Rizwan A, Sannejal A, Sundareshan S, Rawool D, Barbuddhe S, Jhala M, Bannalikar A, Mugalikar D, Kumari V, Dhanalakshmi K, Reddy Y, Rao P, Babra C, Tiwari J, Mukkur T, Costantino P, Wetherall J, Isloor S, Hegde N. Differentiation of Staphylococcus aureus and Staphylococcus epidermidis by PCR for the fibrinogen binding protein gene. J Dairy Sci 2013; 96:2857-65. [DOI: 10.3168/jds.2012-5862] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Accepted: 01/08/2013] [Indexed: 11/19/2022]
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