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Miao Z, De Buck J. Discriminating bovine mastitis pathogens by combining loop-mediated isothermal amplification and amplicon-binding split trehalase assay. Front Vet Sci 2024; 11:1389184. [PMID: 38887539 PMCID: PMC11180830 DOI: 10.3389/fvets.2024.1389184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 05/21/2024] [Indexed: 06/20/2024] Open
Abstract
Bovine mastitis is predominantly caused by intramammary infections with various Gram-positive and Gram-negative bacteria, requiring accurate pathogen identification for effective treatment and antimicrobial resistance prevention. Here, a novel diagnostic method was developed to detect mastitis pathogens in milk samples by combining loop-mediated isothermal amplification with a split enzyme biosensor whereby trehalase fragments were fused with a DNA-binding protein, SpoIIID. Three primer sets, LAMPstaph, LAMPstrep, and LAMPneg, harboring SpoIIID recognition sequences targeted Staphylococcus, Streptococcus, and Gram-negative pathogens, respectively. Limits of detection were determined for DNA extracted from bacterial culture and bacteria-spiked milk. The combined method detected as low as 2, 24, and 10 copies of genomic DNA of staphylococci, streptococci and Escherichia coli and 11 CFU/ml for milk spiked with Escherichia coli. Higher detection limits were observed for Gram-positive bacteria in spiked milk. When testing genomic DNA of 10 mastitis isolates at concentrations of 106 and 103 copies per reaction, no cross-reactivity was detected for LAMPstaph nor LAMPstrep, whereas the LAMPneg assay cross-reacted only with Corynebacterium sp. at the highest concentration. This combined method demonstrated the potential to distinguish mastitis pathogenic Gram types for a rapid decision of antimicrobial treatment without culturing.
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Affiliation(s)
| | - Jeroen De Buck
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
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2
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Jang WS, Park S, Bae JH, Yoon SY, Lim CS, Cho MC. Development of a multiplex Loop-Mediated Isothermal Amplification (LAMP) for the diagnosis of bacterial periprosthetic joint infection. PLoS One 2024; 19:e0302783. [PMID: 38753660 PMCID: PMC11098349 DOI: 10.1371/journal.pone.0302783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 04/11/2024] [Indexed: 05/18/2024] Open
Abstract
BACKGROUND Periprosthetic joint infection (PJI) is one of the most serious and debilitating complications that can occur after total joint arthroplasty. Therefore, early diagnosis and appropriate treatment are important for a good prognosis. Recently, molecular diagnostic methods have been widely used to detect the causative microorganisms of PJI sensitively and rapidly. The Multiplex Loop-Mediated Isothermal Amplification (LAMP) method eliminates the complex temperature cycling and delays caused by temperature transitions seen in polymerase chain reaction (PCR) methods, making it faster and easier to perform compared to PCR-based assays. Therefore, this study developed a multiplex LAMP assay for diagnosing bacterial PJI using LAMP technology and evaluated its analytical and clinical performance. METHODS We developed a multiplex LAMP assay for the detection of five bacteria: Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus agalactiae, Pseudomonas aeruginosa, and Escherichia coli, frequently observed to be the causative agents of PJI. The method of analytical sensitivity and cross-reactivity were determined by spiking standard strains into the joint synovial fluid. The analytical sensitivity of the multiplex LAMP assay was compared with that of a quantitative real-time PCR (qPCR) assay. Clinical performance was evaluated using 20 joint synovial fluid samples collected from patients suspected of having bacterial PJI. RESULTS The analytical sensitivity of the gram-positive bacterial multiplex LAMP assay and qPCR were 105/104 CFU/mL, 103/103 CFU/mL, and 105/104 CFU/mL against S. agalactiae, S. epidermidis, and S. aureus, respectively. For P. aeruginosa and E. coli, the analytical sensitivity of the multiplex LAMP and qPCR assays were 105/104 and 106/104 CFU/mL, respectively. The multiplex LAMP assay detects target bacteria without cross-reacting with other bacteria, and exhibited 100% sensitivity and specificity in clinical performance evaluation. CONCLUSIONS This multiplex LAMP assay can rapidly detect five high-prevalence bacterial species causing bacterial PJI, with excellent sensitivity and specificity, in less than 1 h, and it may be useful for the early diagnosis of PJI.
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Affiliation(s)
- Woong Sik Jang
- Department of Emergency Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Republic of Korea
| | - Seoyeon Park
- Department of Laboratory Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Republic of Korea
| | - Ji Hoon Bae
- Department of Orthopaedic Surgery, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Republic of Korea
| | - Soo Young Yoon
- Department of Laboratory Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Republic of Korea
| | - Chae Seung Lim
- Department of Laboratory Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Republic of Korea
| | - Min-Chul Cho
- Department of Laboratory Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Republic of Korea
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3
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Zhao X, Zeng Y, Yan B, Liu Y, Qian Y, Zhu A, Zhao Y, Zhang X, Zhang C, Wan Z. A novel extraction-free dual HiFi-LAMP assay for detection of methicillin-sensitive and methicillin-resistant Staphylococcus aureus. Microbiol Spectr 2024; 12:e0413323. [PMID: 38376361 PMCID: PMC10986577 DOI: 10.1128/spectrum.04133-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 01/26/2024] [Indexed: 02/21/2024] Open
Abstract
Staphylococcus aureus (S. aureus) is a leading cause of bacteremia and blood stream infections. Methicillin-resistant S. aureus (MRSA) that first appeared in 1961 often caused hospital-acquired infections (HAIs) and community-acquired infections (CAIs) and was associated with high mortality rate. Accurate and rapid point-of-care testing (POCT) of MRSA is crucial for clinical management and treatment of MRSA infections, as well as the prevention and control of HAIs and CAIs. Here, we reported a novel extraction-free dual HiFi-LAMP assay for discriminative detection of methicillin-susceptible S. aureus and MRSA. The dual HiFi-LAMP assay can detect 30 copies/reaction of nuc and mecA genes with detection limits of 147 and 158 copies per 25 µL reaction, respectively. A retrospective clinical evaluation with 107 clinical S. aureus isolates showed both sensitivity and specificity of 100%. A prospective clinical evaluation with 35 clinical samples revealed a specificity of 100% and a sensitivity of 92.3%. The dual HiFi-LAMP assay can detect almost all S. aureus samples (141/142; 99.3%) within 20 min, implying that the entire HiFi-LAMP assay (including sample process) can be completed within 40 min, extremely significantly shorter than 3-5 days by the traditional clinical microbial culture and antibiotic susceptibility testing. The novel extraction-free dual HiFi-LAMP assay can be used as a robust POCT tool to promote precise diagnosis and treatment of MRSA infections in hospitals and to facilitate surveillance of MRSA at hospital and community settings.IMPORTANCEMethicillin-resistant Staphylococcus aureus (MRSA) was associated with high mortality rate and listed as a "priority pathogen" by the World Health Organization. Accurate and rapid point-of-care testing (POCT) of MRSA is critically required for clinical management and treatment of MRSA infections. Some previous LAMP-based POCT assays for MRSA might be questionable due to their low specificity and the lack of appropriate evaluation directly using clinical samples. Furthermore, they are relatively tedious and time-consuming because they require DNA extraction and lack multiplex detection capacity. Here, we reported a novel extraction-free dual HiFi-LAMP assay for discriminative detection of MRSA and methicillin-susceptible S. aureus. The assay has high specificity and sensitivity and can be completed within 40 min. Clinical evaluation with real clinical samples and clinical isolates showed excellent performance with 100% specificity and 92.3%-100% sensitivity. The novel extraction-free assay may be a robust POCT tool to promote precise diagnosis of MRSA infections and facilitate surveillance of MRSA at hospital and community settings.
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Affiliation(s)
- Xiuli Zhao
- Medical Laboratory of Taizhou Fourth People’s Hospital, Taizhou, China
| | - Yi Zeng
- Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Beibei Yan
- Medical Laboratory of Taizhou Fourth People’s Hospital, Taizhou, China
| | - Yanping Liu
- Medical Laboratory of Taizhou Fourth People’s Hospital, Taizhou, China
| | - Yueqin Qian
- Medical Laboratory of Taizhou Fourth People’s Hospital, Taizhou, China
| | - Aiping Zhu
- Medical Laboratory of Taizhou Fourth People’s Hospital, Taizhou, China
| | - Yongjuan Zhao
- Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Xiaoling Zhang
- Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Chiyu Zhang
- Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Zhenzhou Wan
- Medical Laboratory of Taizhou Fourth People’s Hospital, Taizhou, China
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4
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Milton AAP, Prasad MCB, Priya GB, Momin KM, Lyngdoh V, Srinivas K, Das S, Ghatak S. Novel helix loop-mediated isothermal amplification (HAMP) assay for colorimetric detection of Staphylococcus aureus in milk. World J Microbiol Biotechnol 2023; 40:14. [PMID: 37966568 DOI: 10.1007/s11274-023-03838-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 11/12/2023] [Indexed: 11/16/2023]
Abstract
Staphylococcus aureus is an important and leading cause of foodborne diseases worldwide. Prompt detection and recall of contaminated foods are crucial to prevent untoward health consequences caused by S. aureus. Helix loop-mediated isothermal amplification (HAMP) is an exciting recent addition to the array of available isothermal-based nucleic acid amplification techniques. This study aimed to develop and evaluate a HAMP assay for detecting S. aureus in milk and milk products. The assay is completed in 75 minutes of isothermal temperature incubation (64 ˚C) and dye-based visual interpretation of results based on colour change. The specificity of the developed assay was ascertained using 27 S. aureus and 17 non S. aureus bacterial strains. The analytical sensitivity of the developed HAMP assay was 9.7 fg/µL of pure S. aureus DNA. The detection limit of the HAMP assay in milk (86 CFU/mL) was 1000x greater than the routinely used endpoint PCR (86 × 103 CFU/mL). The practicality of applying the HAMP assay was also assessed by analysing milk and milk product samples (n = 95) obtained from different dairy farms and retail outlets. The developed test is a more rapid, sensitive, and user-friendly method for the high-throughput screening of S. aureus in food samples and may therefore be suitable for field laboratories. To our knowledge, this is the first study to develop and evaluate the HAMP platform for detecting S. aureus.
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Affiliation(s)
- A Arun Prince Milton
- Division of Animal and Fisheries Sciences, ICAR Research Complex for NEH Region, Umiam, Meghalaya, India.
| | - M C B Prasad
- Division of Animal and Fisheries Sciences, ICAR Research Complex for NEH Region, Umiam, Meghalaya, India
| | - G Bhuvana Priya
- College of Agriculture, Central Agricultural University (Imphal), Kyrdemkulai, Meghalaya, India.
| | - K M Momin
- Division of Animal and Fisheries Sciences, ICAR Research Complex for NEH Region, Umiam, Meghalaya, India
| | - Vanita Lyngdoh
- Division of Animal and Fisheries Sciences, ICAR Research Complex for NEH Region, Umiam, Meghalaya, India
| | - K Srinivas
- Division of Animal and Fisheries Sciences, ICAR Research Complex for NEH Region, Umiam, Meghalaya, India
| | - Samir Das
- Division of Animal and Fisheries Sciences, ICAR Research Complex for NEH Region, Umiam, Meghalaya, India
| | - Sandeep Ghatak
- Division of Animal and Fisheries Sciences, ICAR Research Complex for NEH Region, Umiam, Meghalaya, India
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5
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Di Salvo E, Panebianco F, Panebianco A, Ziino G. Quantitative Detection of Viable but Nonculturable Vibrio parahaemolyticus in Frozen Bivalve Molluscs. Foods 2023; 12:2373. [PMID: 37372584 DOI: 10.3390/foods12122373] [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: 05/12/2023] [Revised: 06/06/2023] [Accepted: 06/11/2023] [Indexed: 06/29/2023] Open
Abstract
Vibrio parahaemolyticus is a foodborne pathogen diffusely distributed in the marine environment and often isolated from raw seafood belonging to different species, mostly shellfish. Ingestion of under- or uncooked seafood contaminated by V. parahaemolyticus can cause severe gastrointestinal symptoms in humans. Due to its ability to withstand low temperatures, Vibrio spp. could survive in frozen seafoods for long periods by entering the viable but nonculturable state (VBNC) and may constitute an unrecognized source of food contamination and infection. In the present study, seventy-seven frozen bivalve molluscs (35 mussels; 42 clams) were subjected to the detection and enumeration of viable V. parahaemolyticus using standard culture methods. VBNC forms were detected and quantified by applying an optimized protocol based on Propidium Monoazide (PMA) and Quantitative PCR (qPCR). All samples were negative for both the detection and enumeration of V. parahaemolyticus by the standard culture methods. VBNC forms were detected in 11.7% of the samples (9/77), with values ranging from 1.67 to 2.29 Log CFU/g. Only clam samples were positive for the detection of VBNC forms. The results of this study highlighted that VBNC V. parahaemolyticus may be present in frozen bivalve molluscs. Further data on the prevalence of VBNC V. parahaemolyticus in frozen seafood are needed in order to perform a robust risk assessment.
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Affiliation(s)
- Eleonora Di Salvo
- Department of Veterinary Sciences, University of Messina, Polo Universitario dell'Annunziata, Viale Palatucci snc, 98168 Messina, Italy
| | - Felice Panebianco
- Department of Veterinary Sciences, University of Turin, Largo Braccini 2, Grugliasco, 10095 Turin, Italy
| | - Antonio Panebianco
- Department of Veterinary Sciences, University of Messina, Polo Universitario dell'Annunziata, Viale Palatucci snc, 98168 Messina, Italy
| | - Graziella Ziino
- Department of Veterinary Sciences, University of Messina, Polo Universitario dell'Annunziata, Viale Palatucci snc, 98168 Messina, Italy
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Yin C, Pang B, Huang Y, Li J, Meng T, Zhang M, Zhang L, Gao Y, Song X. Multiplex polymerase spiral reaction for simultaneous detection of Salmonella typhimurium and Staphylococcus aureus. Anal Biochem 2023; 667:115086. [PMID: 36813221 DOI: 10.1016/j.ab.2023.115086] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 02/10/2023] [Accepted: 02/15/2023] [Indexed: 02/24/2023]
Abstract
Salmonella typhimurium (S. typhimurium) and Staphylococcus aureus (S. aureus) are common food-borne pahogens that cause food poisoning in humans. In this study, we developed a method for the simultaneous determination of S. typhimurium and S. aureus based on multiplex polymerase spiral reaction (m-PSR) and melting curve analysis. Two pairs of primers were designed specifically to target the conserved invA gene of S. typhimurium and nuc gene of S. aureus, and the nucleic acid amplification reaction was achieved under isothermal conditions in the same reaction tube for 40 min at 61 °C, melting curve analysis of the amplification product was carried out. The distinct mean melting temperature allowed simultaneous differentiation of the two target bacteria in the m-PSR assay. The limit of detection of S. typhimurium and S. aureus that could be detected simultaneously was 4.1 × 10-4 ng genomic DNA and 2 × 101 CFU/mL pure bacterial culture. Based on this method, analysis of artificially contaminated samples showed excellent sensitivity and specificity consistent with those of pure bacterial cultures. This method is rapid, simultaneous and promises to be a useful tool for the detection of food-borne pathogens in the food industry.
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Affiliation(s)
- Caihong Yin
- Department of Hygienic Inspection, School of Public Health, Jilin University, Changchun, 130021, PR China
| | - Bo Pang
- Department of Hygienic Inspection, School of Public Health, Jilin University, Changchun, 130021, PR China
| | - Yanzhi Huang
- Research Laboratory, Changchun Children's Hospital, Changchun, 130061, Jilin, PR China
| | - Jinhua Li
- Department of Hygienic Inspection, School of Public Health, Jilin University, Changchun, 130021, PR China
| | - Tingyu Meng
- Research Laboratory, Changchun Children's Hospital, Changchun, 130061, Jilin, PR China
| | - Mengfan Zhang
- Department of Hygienic Inspection, School of Public Health, Jilin University, Changchun, 130021, PR China.
| | - Liang Zhang
- Department of Hygienic Inspection, School of Public Health, Jilin University, Changchun, 130021, PR China
| | - Yanli Gao
- Department of Pediatric Ultrasound, The First Hospital of Jilin University, Changchun, 130000, PR China.
| | - Xiuling Song
- Department of Hygienic Inspection, School of Public Health, Jilin University, Changchun, 130021, PR China.
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7
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Zhai Y, Yu H, Liu X, Zhang M, Han R, Yin C, Liu X, Li H, Li J, Song X. Visual detection of Staphylococcus aureus based on immunomagnetic separation and polymerase spiral reaction. Food Control 2023. [DOI: 10.1016/j.foodcont.2023.109621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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8
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Use of nano titanium hydroxide and nano zirconium hydroxide fixed filter paper for rapid detection of Staphylococcus aureus in dairy products by PCR without pre-enrichment. Food Control 2023. [DOI: 10.1016/j.foodcont.2023.109664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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9
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Cabrales-Arellano P, Park E, Minor M, Delgado E, Valles-Rosales D, Taboada H, Espiritu J, Su J, Park YH. Rapid identification of Staphylococcus aureus based on a fluorescence imaging/detection platform that combines loop mediated isothermal amplification assay and the smartphone-based system. Sci Rep 2022; 12:20655. [PMID: 36450878 PMCID: PMC9712598 DOI: 10.1038/s41598-022-25190-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 11/25/2022] [Indexed: 12/05/2022] Open
Abstract
Food associated diseases pose significant public health threat in the United States. Health risks associated with food-borne pathogens drive the need for constant monitoring of food products. An efficient method that can diagnose food-borne pathogens rapidly will be invaluable and in high demand. In this study, we showed the feasibility of a novel rapid detection platform based on fluorescence imaging/detection that combines a user-friendly, portable loop mediated isothermal amplification (LAMP) reaction device and a smartphone-based detection system. The proposed platform was used to detect Staphylococcus aureus which is one of the most important food-borne pathogen especially dairy products. The complete protocol is quicker; the reaction is performed under isothermal conditions and completed in 1 h or less. Experimental results show that LAMP assays were ten-fold more sensitive than PCR-based detection. The proposed smartphone detection system was able to detect and quantify LAMP assay samples containing three different concentrations of S. aureus from 109 CFU/mL down to 103 CFU/mL. The present proof-of-concept study demonstrated that this platform offers a portable, easy to use method for measuring target pathogens with LAMP amplification.
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Affiliation(s)
- Patricia Cabrales-Arellano
- grid.24805.3b0000 0001 0687 2182Family and Consumer Science Department, New Mexico State University, Las Cruces, NM 88003 USA
| | - Edward Park
- grid.24805.3b0000 0001 0687 2182Biology Department, New Mexico State University, Las Cruces, NM 88003 USA
| | - Martha Minor
- grid.24805.3b0000 0001 0687 2182Family and Consumer Science Department, New Mexico State University, Las Cruces, NM 88003 USA
| | - Efren Delgado
- grid.24805.3b0000 0001 0687 2182Family and Consumer Science Department, New Mexico State University, Las Cruces, NM 88003 USA
| | - Delia Valles-Rosales
- grid.264760.10000 0004 0387 0036Industrial Management and Technology Department, Texas A&M University Kingsville, Kingsville, TX 78363 USA
| | - Heidi Taboada
- grid.264760.10000 0004 0387 0036Mechanical and Industrial Engineering Department, Texas A&M University Kingsville, Kingsville, TX 78363 USA
| | - José Espiritu
- grid.264760.10000 0004 0387 0036Mechanical and Industrial Engineering Department, Texas A&M University Kingsville, Kingsville, TX 78363 USA
| | - Jianzhong Su
- grid.267315.40000 0001 2181 9515Department of Mathematics, University of Texas at Arlington, Arlington, TX 76019 USA
| | - Young Ho Park
- grid.24805.3b0000 0001 0687 2182Mechanical Engineering Department, New Mexico State University, Las Cruces, NM 88003 USA
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10
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Neculai-Valeanu AS, Ariton AM. Udder Health Monitoring for Prevention of Bovine Mastitis and Improvement of Milk Quality. Bioengineering (Basel) 2022; 9:608. [PMID: 36354519 PMCID: PMC9687184 DOI: 10.3390/bioengineering9110608] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/19/2022] [Accepted: 10/20/2022] [Indexed: 08/05/2023] Open
Abstract
To maximize milk production, efficiency, and profits, modern dairy cows are genetically selected and bred to produce more and more milk and are fed copious quantities of high-energy feed to support ever-increasing milk volumes. As demands for increased milk yield and milking efficiency continue to rise to provide for the growing world population, more significant stress is placed on the dairy cow's productive capacity. In this climate, which is becoming increasingly hotter, millions of people depend on the capacity of cattle to respond to new environments and to cope with temperature shocks as well as additional stress factors such as solar radiation, animal crowding, insect pests, and poor ventilation, which are often associated with an increased risk of mastitis, resulting in lower milk quality and reduced production. This article reviews the impact of heat stress on milk production and quality and emphasizes the importance of udder health monitoring, with a focus on the use of emergent methods for monitoring udder health, such as infrared thermography, biosensors, and lab-on-chip devices, which may promote animal health and welfare, as well as the quality and safety of dairy products, without hindering the technological flow, while providing significant benefits to farmers, manufacturers, and consumers.
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11
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Wang YL, Zhang X, Wang Q, Liu PX, Tang W, Guo R, Zhang HY, Chen ZG, Han XG, Jiang W. Rapid and visual detection of Staphylococcus aureus in milk using a recombinase polymerase amplification-lateral flow assay combined with immunomagnetic separation. J Appl Microbiol 2022; 133:3741-3754. [PMID: 36073301 DOI: 10.1111/jam.15811] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 08/31/2022] [Accepted: 09/01/2022] [Indexed: 11/27/2022]
Abstract
AIMS The aim of this study was to develop a novel approach using lateral flow recombinase polymerase amplification (RPA-LF) combined with immunomagnetic separation (IMS) for the rapid detection of Staphylococcus aureus in milk. METHODS AND RESULTS Under optimum conditions, the average capture efficiency values (CEs) for S. aureus strains (104 CFU ml-1 ) was above 95.0% in PBST and ~80% in milk within 45 min with 0.7 mg immunomagnetic beads. The RPA-LF assay, which comprised DNA amplification via RPA at 39°C for 10 min and visualization of the amplicons through LF strips for 5 min, detected S. aureus within 15 min. The method only detected S. aureus and did not show cross-reaction with other bacteria, exhibiting a high level of specificity. Sensitivity experiments confirmed a detection limit of RPA-LF assay as low as 600 fg reaction-1 for the S. aureus genome (corresponding to approximately 36 CFU of S. aureus), which was about 16.7-fold more sensitive than that of the conventional PCR method. When RPA-LF was used in combination with IMS to detect S. aureus inoculated into artificially contaminated milk, it exhibited a detection limit of approximately 40 CFU reaction-1 . CONCLUSIONS The newly developed IMS-RPA-LF method enabled detection of S. aureus at levels as low as 40 CFU reaction-1 in milk samples without culture enrichment for an overall testing time of only 70 min. SIGNIFICANCE AND IMPACT OF THE STUDY The newly developed IMS-RPA-LF assay effectively combines sample preparation, amplification, and detection into a single platform. Because of its high sensitivity, specificity, and speed, the IMS-RPA-LF assay will have important implications for the rapid detection of S. aureus in contaminated food.
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Affiliation(s)
- Ya-Lei Wang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Xin Zhang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Quan Wang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Peng-Xuan Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Wei Tang
- Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Rong Guo
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Hai-Yang Zhang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Zhao-Guo Chen
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Xian-Gan Han
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Wei Jiang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
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12
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Sandwich Fluorescence Detection of Foodborne Pathogen Staphylococcus aureus with CD Fluorescence Signal Amplification in Food Samples. Foods 2022; 11:foods11070945. [PMID: 35407032 PMCID: PMC8997861 DOI: 10.3390/foods11070945] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 03/16/2022] [Accepted: 03/21/2022] [Indexed: 12/15/2022] Open
Abstract
Timely detection of Staphylococcus aureus (S. aureus) is critical because it can multiply to disease−causing levels in a matter of hours. Herein, a simple and sensitive DNA tetrahedral (Td) fluorescence signal amplifier with blue carbon quantum dots (bCDs) was prepared for sandwich detection of S. aureus. bCD was modified at the apex of Td, and an aptamer on Td was used to accurately identify and “adsorb” the amplifier to the surface of S. aureus. Atomic force microscopy (AFM) demonstrates the successful preparation of this signal amplifier. The fluorescence intensity emitted in this strategy increased 4.72 times. The strategy showed a stronger fluorescence intensity change, sensitivity (linear range of 7.22 × 100–1.44 × 109 CFU/mL with a LOD of 4 CFU/mL), and selectivity. The recovery rate in qualified pasteurized milk and drinking water samples was 96.54% to 104.72%. Compared with simple aptamer sandwich detection, these fluorescence signal amplifiers have improved fluorescence detection of S. aureus. Additionally, this fluorescent signal amplification strategy may be applied to the detection of other food pathogens or environmental microorganisms in the future.
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13
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Rapid and visual detection of viable Staphylococcus aureus in pork and pork products by PMA and saltatory rolling circle amplification. Eur Food Res Technol 2022. [DOI: 10.1007/s00217-022-03990-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Wang C, Xu Z, Hou X, Wang M, Zhou C, Liang J, Wei P. Rapid, Sensitive, Specific, and Visual Detection of Salmonella in Retail Meat with Loop-Mediated Isothermal Amplification, Targeting the invA Gene. J Food Prot 2022; 85:6-12. [PMID: 34436593 DOI: 10.4315/jfp-21-186] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 08/24/2021] [Indexed: 11/11/2022]
Abstract
ABSTRACT Salmonella is one of the major pathogenic bacteria causing foodborne diseases. The rapid detection of Salmonella in food is of great significance to food safety. In this study, the loop-mediated isothermal amplification (LAMP) method was developed, and primers were designed targeting the invA gene of Salmonella. Standard samples of recombinant invA-plasmid and 100 retail meat samples were tested by LAMP and compared with the results tested by conventional PCR and the routine Chinese National Food Safety Standard-Microbiological Examination of Food-Examination of Salmonella, respectively. The results showed that Salmonella strains of eight different serotypes were amplified successfully by the developed LAMP assay, and it was 1,000-fold more sensitive than conventional PCR, with the analytical sensitivity of 8 × 102 copies per μL of the standard sample of invA-plasmid. The results were visualized directly by adding calcein and MnCl2 in the LAMP reaction tube, and the positively amplified products turned green after an incubation of 2 min. In parallel detection, the positive rate of Salmonella by the LAMP assay was highly correlated with the routine Chinese national standard method. The results of the study demonstrated that the developed LAMP assay is a simple, rapid, strongly specific, highly sensitive, and visual detection method for Salmonella. HIGHLIGHTS
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Affiliation(s)
- Can Wang
- Participating Laboratory of the World Health Organization Global Foodborne Infections Network, Institute for Poultry Science and Health, Guangxi University, Nanning 530004, Guangxi, People's Republic of China
| | - Ziheng Xu
- Participating Laboratory of the World Health Organization Global Foodborne Infections Network, Institute for Poultry Science and Health, Guangxi University, Nanning 530004, Guangxi, People's Republic of China
| | - Xuejiao Hou
- Participating Laboratory of the World Health Organization Global Foodborne Infections Network, Institute for Poultry Science and Health, Guangxi University, Nanning 530004, Guangxi, People's Republic of China
| | - Min Wang
- Participating Laboratory of the World Health Organization Global Foodborne Infections Network, Institute for Poultry Science and Health, Guangxi University, Nanning 530004, Guangxi, People's Republic of China
| | - Chenyu Zhou
- Participating Laboratory of the World Health Organization Global Foodborne Infections Network, Institute for Poultry Science and Health, Guangxi University, Nanning 530004, Guangxi, People's Republic of China
| | - Jingzhen Liang
- Participating Laboratory of the World Health Organization Global Foodborne Infections Network, Institute for Poultry Science and Health, Guangxi University, Nanning 530004, Guangxi, People's Republic of China
| | - Ping Wei
- Participating Laboratory of the World Health Organization Global Foodborne Infections Network, Institute for Poultry Science and Health, Guangxi University, Nanning 530004, Guangxi, People's Republic of China
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15
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Molecular Methods for Pathogenic Bacteria Detection and Recent Advances in Wastewater Analysis. WATER 2021. [DOI: 10.3390/w13243551] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
With increasing concerns about public health and the development of molecular techniques, new detection tools and the combination of existing approaches have increased the abilities of pathogenic bacteria monitoring by exploring new biomarkers, increasing the sensitivity and accuracy of detection, quantification, and analyzing various genes such as functional genes and antimicrobial resistance genes (ARG). Molecular methods are gradually emerging as the most popular detection approach for pathogens, in addition to the conventional culture-based plate enumeration methods. The analysis of pathogens in wastewater and the back-estimation of infections in the community, also known as wastewater-based epidemiology (WBE), is an emerging methodology and has a great potential to supplement current surveillance systems for the monitoring of infectious diseases and the early warning of outbreaks. However, as a complex matrix, wastewater largely challenges the analytical performance of molecular methods. This review synthesized the literature of typical pathogenic bacteria in wastewater, types of biomarkers, molecular methods for bacterial analysis, and their recent advances in wastewater analysis. The advantages and limitation of these molecular methods were evaluated, and their prospects in WBE were discussed to provide insight for future development.
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16
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Wu C, Zeng Y, He Y. Rapid visualization and detection of Staphylococcus aureus based on loop-mediated isothermal amplification. World J Microbiol Biotechnol 2021; 37:209. [PMID: 34719733 DOI: 10.1007/s11274-021-03178-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 10/25/2021] [Indexed: 10/20/2022]
Abstract
Staphylococcus aureus is a common clinical bacterial pathogen that can cause a diverse range of infections. The establishment of a rapid and reliable assay for the early diagnosis and detection of S. aureus is of great significance. In this study, we developed a closed-tube loop-mediated isothermal amplification (LAMP) assay for the visual detection of S. aureus using the colorimetric indicator hydroxy naphthol blue (HNB). The LAMP reaction was optimized by adjusting the amplification temperature, the concentrations of Mg2+, dNTP, and HNB, and the incubation time. In the optimized reaction system, the specificity of LAMP for S. aureus was 100%. The results established that this method accurately identified S. aureus, with no cross-reactivity with 14 non-S. aureus strains. The limit of detection (LOD) of LAMP was 8 copies/reaction of purified plasmid DNA or 400 colony-forming units/reaction of S. aureus. Compared with conventional PCR, LAMP lowered the LOD by tenfold. Finally, 220 clinically isolated strains of S. aureus and 149 non-S. aureus strains were used to evaluate the diagnostic efficacy of LAMP (test accuracy, 99.46%). The findings indicated that LAMP is a reliable test for S. aureus and could be a promising tool for the rapid diagnosis of S. aureus infections.
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Affiliation(s)
- Chuan Wu
- Chongqing Key Laboratory of Sichuan-Chongqing Co-Construction for Diagnosis and Treatment of Infectious Diseases Integrated Traditional Chinese and Western Medicine, College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, Sichuan, China
| | - Yuanyuan Zeng
- Chongqing Key Laboratory of Sichuan-Chongqing Co-Construction for Diagnosis and Treatment of Infectious Diseases Integrated Traditional Chinese and Western Medicine, College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, Sichuan, China
| | - Yang He
- Chongqing Key Laboratory of Sichuan-Chongqing Co-Construction for Diagnosis and Treatment of Infectious Diseases Integrated Traditional Chinese and Western Medicine, College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, Sichuan, China.
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17
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Priya GB, Agrawal RK, Milton AAP, Mendiratta SK, Singh BR, Kumar D, Mishra M, Gandham RK. Isothermal amplification assay for visual on-site detection of Staphylococcus aureus in Chevon. FOOD BIOTECHNOL 2021. [DOI: 10.1080/08905436.2021.1941078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Govindarajan Bhuvana Priya
- Division of Bacteriology & Mycology, ICAR-Indian Veterinary Research Institute, Bareilly, India
- College of Agriculture, Central Agriculture University (Imphal), Imphal, India
| | - Ravi Kant Agrawal
- Division of Livestock Products Technology, ICAR-Indian Veterinary Research Institute, Bareilly, India
| | | | - Sanjod Kumar Mendiratta
- Division of Livestock Products Technology, ICAR-Indian Veterinary Research Institute, Bareilly, India
| | - Bhoj Raj Singh
- Division of Veterinary Epidemiology, ICAR-Indian Veterinary Research Institute, Bareilly, India
| | - Deepak Kumar
- Division of Veterinary Biotechnology, ICAR-Indian Veterinary Research Institute, Bareilly, India
| | - Madhu Mishra
- Division of Bacteriology & Mycology, ICAR-Indian Veterinary Research Institute, Bareilly, India
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18
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Sharun K, Dhama K, Tiwari R, Gugjoo MB, Iqbal Yatoo M, Patel SK, Pathak M, Karthik K, Khurana SK, Singh R, Puvvala B, Amarpal, Singh R, Singh KP, Chaicumpa W. Advances in therapeutic and managemental approaches of bovine mastitis: a comprehensive review. Vet Q 2021; 41:107-136. [PMID: 33509059 PMCID: PMC7906113 DOI: 10.1080/01652176.2021.1882713] [Citation(s) in RCA: 93] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Mastitis (intramammary inflammation) caused by infectious pathogens is still considered a devastating condition of dairy animals affecting animal welfare as well as economically incurring huge losses to the dairy industry by means of decreased production performance and increased culling rates. Bovine mastitis is the inflammation of the mammary glands/udder of bovines, caused by bacterial pathogens, in most cases. Routine diagnosis is based on clinical and subclinical forms of the disease. This underlines the significance of early and rapid identification/detection of etiological agents at the farm level, for which several diagnostic techniques have been developed. Therapeutic regimens such as antibiotics, immunotherapy, bacteriocins, bacteriophages, antimicrobial peptides, probiotics, stem cell therapy, native secretory factors, nutritional, dry cow and lactation therapy, genetic selection, herbs, and nanoparticle technology-based therapy have been evaluated for their efficacy in the treatment of mastitis. Even though several strategies have been developed over the years for the purpose of managing both clinical and subclinical forms of mastitis, all of them lacked the efficacy to eliminate the associated etiological agent when used as a monotherapy. Further, research has to be directed towards the development of new therapeutic agents/techniques that can both replace conventional techniques and also solve the problem of emerging antibiotic resistance. The objective of the present review is to describe the etiological agents, pathogenesis, and diagnosis in brief along with an extensive discussion on the advances in the treatment and management of mastitis, which would help safeguard the health of dairy animals.
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Affiliation(s)
- Khan Sharun
- Division of Surgery, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
| | - Kuldeep Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
| | - Ruchi Tiwari
- Department of Veterinary Microbiology and Immunology, College of Veterinary Sciences, Deen Dayal Upadhayay Pashu Chikitsa Vigyan Vishwavidyalay Evum Go-Anusandhan Sansthan (DUVASU), Mathura, India
| | - Mudasir Bashir Gugjoo
- Division of Veterinary Clinical Complex, Faculty of Veterinary Sciences & Animal Husbandry, Sher-E-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar, Srinagar, Jammu and Kashmir, India
| | - Mohd Iqbal Yatoo
- Sher-E-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar, Srinagar, Jammu and Kashmir, India
| | - Shailesh Kumar Patel
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
| | - Mamta Pathak
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
| | - Kumaragurubaran Karthik
- Central University Laboratory, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu, India
| | | | - Rahul Singh
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
| | - Bhavani Puvvala
- Rajiv Gandhi Institute of Veterinary Education and Research, Kurumbapet, Puducherry, India
| | - Amarpal
- Division of Surgery, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
| | - Rajendra Singh
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
| | - Karam Pal Singh
- Division of Surgery, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
| | - Wanpen Chaicumpa
- Center of Research Excellence on Therapeutic Proteins and Antibody Engineering, Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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19
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Milton AAP, Momin KM, Ghatak S, Thomas SC, Priya GB, Angappan M, Das S, Sanjukta R, Puro K, Shakuntala I, Sen A, Kandpal B. Development of a novel polymerase spiral reaction (PSR) assay for rapid and visual detection of Staphylococcus aureus in meat. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2020.110507] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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20
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Chen X, Wang H, Liu C, Qi Y, Guo W. Technical note: Development of a closed-tube isothermal multiple self-matching-initiated amplification assay for visual detection of Staphylococcus aureus in milk samples. J Dairy Sci 2020; 104:3569-3574. [PMID: 33358821 DOI: 10.3168/jds.2020-19023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 09/28/2020] [Indexed: 02/02/2023]
Abstract
Staphylococcus aureus is one of the most common mastitis-causing bacteria in dairy cows. It is associated with reduced production performance in animals and with huge financial losses for the dairy industry worldwide. An accurate and sensitive method for the early diagnosis and identification of Staph. aureus in milk samples is essential. The present study aimed to establish a closed-tube isothermal multiple self-matching-initiated amplification (IMSA) technique for visual confirmation of the presence of Staph. aureus targeting the nuc conserved sequence gene. The specific primers successfully amplified the target sequence within 45 min at 63°C reaction temperature and using the optimal components of the reaction system. The positive amplicon showed bright green fluorescence under UV light when mixed with the chromogenic substrate SYBR Green I, and the negative samples remained orange in color. We observed fluorescence and a ladder-like pattern in the IMSA amplicon for all Staph. aureus strains, and we observed no significant change for the non-Staph. aureus strains. The IMSA assay had high specificity compared with loop-mediated isothermal amplification (LAMP): it confirmed the presence of all 7 Staph. aureus strains, and we found no false-positive results for the 12 non-Staph. aureus strains. The lower limit of detection for the IMSA assay was 1 × 102 cfu/mL, 10-fold more sensitive than the results obtained using LAMP. We also successfully applied the IMSA assay to confirm the presence of Staph. aureus in milk samples of cows with mastitis, and the results were consistent with those of LAMP and real-time PCR. The present study reports the use of IMSA to confirm the presence of Staph. aureus and provides a potentially useful method for rapid preliminary screening for Staph. aureus.
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Affiliation(s)
- Xuelong Chen
- College of Animal Science, Anhui Science and Technology University, Fengyang 233100, China; Anhui Province Key Laboratory of Animal Nutritional Regulation and Health, Anhui Science and Technology University, Fengyang 233100, China
| | - Honghai Wang
- Daqing Agricultural and Rural Bureau, Daqing 163000, China
| | - Chang Liu
- College of Animal Science, Anhui Science and Technology University, Fengyang 233100, China
| | - Yanping Qi
- College of Animal Science, Anhui Science and Technology University, Fengyang 233100, China; Anhui Province Key Laboratory of Animal Nutritional Regulation and Health, Anhui Science and Technology University, Fengyang 233100, China.
| | - Weina Guo
- College of Animal Science, Anhui Science and Technology University, Fengyang 233100, China.
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21
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Matuozzo M, Spagnuolo MS, Hussein HA, Gomaa AM, Scaloni A, D’Ambrosio C. Novel Biomarkers of Mastitis in Goat Milk Revealed by MALDI-TOF-MS-Based Peptide Profiling. BIOLOGY 2020; 9:biology9080193. [PMID: 32731427 PMCID: PMC7464427 DOI: 10.3390/biology9080193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/22/2020] [Accepted: 07/22/2020] [Indexed: 11/16/2022]
Abstract
Mastitis is the most common infection of dairy goats impairing milk production and quality, which is usually recognized by mammary gland visual inspection and palpation. Subclinical forms of the disease are also widely represented, which lack the typical signs of the clinical ones but are still associated with reduced production and safety for human consumption of milk, generally presenting a high bacterial count. In order to obtain novel analytical tools for rapid and non-invasive diagnosis of mastitis in goats, we analyzed milk samples from healthy, subclinical and clinical mastitic animals with a MALDI-TOF-MS-based peptidomic platform, generating disease group-specific spectral profiles whose signal intensity and mass values were analyzed by statistics. Peculiar spectral signatures of mastitis with respect to the control were identified, while no significant spectral differences were observed between clinical and subclinical milk samples. Discriminant signals were assigned to specific peptides through nanoLC-ESI-Q-Orbitrap-MS/MS experiments. Some of these molecules were predicted to have an antimicrobial activity based on their strong similarity with homolog bioactive compounds from other mammals. Through the definition of a panel of peptide biomarkers, this study provides a very rapid and low-cost method to routinely detect mastitic milk samples even though no evident clinical signs in the mammary gland are observed.
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Affiliation(s)
- Monica Matuozzo
- Institute for the Animal Production System in the Mediterranean Environment (ISPAAM), National Research Council (CNR), 80147 Naples, Italy; (M.M.); (M.S.S.); (A.S.)
| | - Maria Stefania Spagnuolo
- Institute for the Animal Production System in the Mediterranean Environment (ISPAAM), National Research Council (CNR), 80147 Naples, Italy; (M.M.); (M.S.S.); (A.S.)
| | - Hany A. Hussein
- Department of Animal Reproduction and Artificial Insemination, National Research Centre, Giza 12622, Egypt;
- Department of Veterinary Research, Guangdong Haid Institute of Animal Husbandry and Veterinary (GHIAHV), Guangzhou 511400, China
| | - A. M. Gomaa
- Animal Reproduction Research Institute (ARRI), Agriculture Research Center, Ministry of Agriculture, Giza 12556, Egypt;
| | - Andrea Scaloni
- Institute for the Animal Production System in the Mediterranean Environment (ISPAAM), National Research Council (CNR), 80147 Naples, Italy; (M.M.); (M.S.S.); (A.S.)
| | - Chiara D’Ambrosio
- Institute for the Animal Production System in the Mediterranean Environment (ISPAAM), National Research Council (CNR), 80147 Naples, Italy; (M.M.); (M.S.S.); (A.S.)
- Correspondence:
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22
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Griffioen K, Cornelissen J, Heuvelink A, Adusei D, Mevius D, Jan van der Wal F. Development and evaluation of 4 loop-mediated isothermal amplification assays to detect mastitis-causing bacteria in bovine milk samples. J Dairy Sci 2020; 103:8407-8420. [PMID: 32564949 DOI: 10.3168/jds.2019-18035] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 04/06/2020] [Indexed: 12/22/2022]
Abstract
Farmers prefer fast, sensitive, and on-site tests for treatment decisions on mastitis. Due to the time to results of the currently available diagnostic tools, these are rarely used for that purpose. Genotypic tests that do not require a growth step may be suitable for on-site testing, for example loop-mediated isothermal amplification (LAMP), which has been described as a sensitive test that can be used on-site. Therefore, this study aimed to develop and evaluate LAMP assays for the detection of a subset of mastitis-causing pathogens, Escherichia coli, Klebsiella pneumoniae, Staphylococcus aureus, and Streptococcus spp., in milk from cows with clinical mastitis. Furthermore, a generic nucleic acid lateral flow immunoassay (NALFIA) was evaluated as a potential on-site readout of the LAMP assays. For each assay of LAMP and NALFIA, the limit of detection and analytical specificity were determined using isolates, and the diagnostic specificity was determined using selected samples with known etiology. In addition, the diagnostic specificity of LAMP was determined using field samples with unknown etiology at testing. Bacteriological culture with identification by mass spectrometry was used as a reference method. The 4 assays had a kappa ≥0.73 with the reference method when testing the selected samples, but ≥0.47 when testing field samples. After correcting for prevalence, kappa was ≥0.80 for the E. coli, K. pneumoniae, and Staph. aureus assays. The Streptococcus spp. assay had a kappa of 0.47 (0.48 after correction) with the reference method, probably caused by the assay broadly targeting a genus instead of a particular species. The NALFIA readout was found to have kappa ≥0.81 for the E. coli, Staph. aureus, and Streptococcus spp. assays at a generic runtime, but for the K. pneumoniae assay a shorter runtime could be used. In conclusion, LAMP is a promising method for fast on-site tests for mastitis-causing pathogens if the current elaborate method for sample preparation is replaced by a simplified protocol. The NALFIA is an easy and reliable readout for on-site use, with the observation that for the current assay designs a generic runtime is not yet possible for the chosen set of pathogens. If associated with a simple and fast sample preparation protocol, the combination of LAMP and NALFIA has the potential to enable fast and reliable on-site testing of clinical mastitis milk samples.
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Affiliation(s)
- Karien Griffioen
- Faculty of Veterinary Medicine, Department of Farm Animal Health, Utrecht University, PO Box 80151, 3508 TD Utrecht, the Netherlands.
| | - Jan Cornelissen
- Wageningen Bioveterinary Research, Department of Infection Biology, Wageningen UR, PO Box 65, 8200 AB Lelystad, the Netherlands
| | | | - Daniela Adusei
- Wageningen Bioveterinary Research, Department of Infection Biology, Wageningen UR, PO Box 65, 8200 AB Lelystad, the Netherlands
| | - Dik Mevius
- Wageningen Bioveterinary Research, Department of Infection Biology, Wageningen UR, PO Box 65, 8200 AB Lelystad, the Netherlands; Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, PO Box 80165, 3508 TD Utrecht, the Netherlands
| | - Fimme Jan van der Wal
- Wageningen Bioveterinary Research, Department of Infection Biology, Wageningen UR, PO Box 65, 8200 AB Lelystad, the Netherlands
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Liao W, Long D, Huang Q, Wei D, Liu X, Wan L, Feng Y, Zhang W, Liu Y. Rapid Detection to Differentiate Hypervirulent Klebsiella pneumoniae (hvKp) From Classical K. pneumoniae by Identifying peg-344 With Loop-Mediated Isothermal Amplication (LAMP). Front Microbiol 2020; 11:1189. [PMID: 32655515 PMCID: PMC7325879 DOI: 10.3389/fmicb.2020.01189] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Accepted: 05/11/2020] [Indexed: 12/22/2022] Open
Abstract
Objectives To establish a rapid molecular diagnostics of hvKp using the peg-344 loop-mediated isothermal amplification technique (LAMP). Methods In all, 28 K. pneumoniae strains isolated from the blood of patients were used for the peg-344 LAMP. K. pneumoniae NTUH-K2044 and K. pneumoniae ATCC700603 were used as positive control and negative control, respectively. For comparison, all the results were detected in a polymerase chain reaction (PCR), which was considered the gold standard for the detection of the gene. Mouse lethality assay, and Serum killing assay were also used to determine the virulence phenotype of K. pneumoniae. Results We determined the specificity and sensitivity of the primers for peg-344 detection in the LAMP reactions. This LAMP assay was able to specifically differentiate hvKp from classical K. pneumoniae (cKp) at 65°C, which was 100-fold more sensitive than a PCR assay for peg-344 detection. The virulence phenotype of K. pneumoniae detected by LAMP was as precise as by Mouse lethality assay and Serum killing assay. Conclusion The LAMP assay is easy to perform and rapid. Therefore, it can be routinely applied to differentiate hvKp from cKp in the clinical laboratory.
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Affiliation(s)
- Wenjian Liao
- Department of Respiratory Medicine, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Dan Long
- Department of Clinical Microbiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Qisen Huang
- Department of Clinical Microbiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Dandan Wei
- Department of Clinical Microbiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Xiaobing Liu
- Department of Endocrinology Medicine, The Third Hospital of Nanchang, Nanchang, China
| | - Lagen Wan
- Department of Clinical Microbiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Yuling Feng
- Medicine College, Nanchang University, Nanchang, China
| | - Wei Zhang
- Department of Respiratory Medicine, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Yang Liu
- Department of Clinical Microbiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
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24
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Hu J, Wang Y, Ding H, Jiang C, Geng Y, Sun X, Jing J, Gao H, Wang Z, Dong C. Recombinase polymerase amplification with polymer flocculation sedimentation for rapid detection of Staphylococcus aureus in food samples. Int J Food Microbiol 2020; 331:108691. [PMID: 32534163 DOI: 10.1016/j.ijfoodmicro.2020.108691] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 05/12/2020] [Accepted: 05/26/2020] [Indexed: 01/02/2023]
Abstract
Currently, rapid, sensitive, and convenient visual detection methods for Staphylococcus aureus (S. aureus) are scarce. In this study, a novel detection method based on recombinase polymerase amplification (RPA) and polymer flocculation sedimentation (PFS) was developed. Twelve effective primer combinations derived from four forward primers F1, F2, F3, F4, and three reverse primers R1, R2, R3 targeting the nuc gene of S. aureus were designed and screened by a polymerase chain reaction and RPA methods. RPA reaction conditions, including temperature, time, and volume as well as PEG8000 and NaCl concentrations range, were optimized. Moreover, the specificity and sensitivity of the RPA-PFS assay were further analyzed. Finally, the potential use of the RPA-PFS assay was evaluated using artificially S. aureus contaminated food samples, including pork, beef, shrimp, fish, cheese, cabbage, leftover rice, egg, milk, and orange juice. Results showed that the SA5 (F2/R2) combination was the optimal primer candidate. The optimal temperature range, the shortest time and the minimal volume of RPA reaction were 40-42 °C, 10 min and 10 μL, respectively and the optimal PEG8000/NaCl concentrations were 0.2 g/mL and 2.5 M, respectively, for the adsorption between magnetic beads and RPA products. The RPA-PFS method could detect as little as 13 fg genomic DNA of S. aureus and was also specific for five target S. aureus as well as twenty-seven non-target foodborne bacteria. The limit of detection of RPA-PFS for S. aureus in artificially contaminated food samples was 38 CFU/mL (g). Besides, RPA-PFS has directly been judged by the naked eye and has totally taken less than 20 min. In short, the assay RPA-PFS developed in this study is a rapid, sensitive, and specific visual detection method for S. aureus.
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Affiliation(s)
- Jinqiang Hu
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, Henan Province, China; International Joint Laboratory of Food Safety, Zhengzhou 450000, Henan Province, China; Collaborative Innovation Center of Food Production and Safety, Zhengzhou 450000, Henan Province, China; Henan Key Laboratory of Cold Chain Food Quality and Safety Control, Zhengzhou 450000, Henan Province, China.
| | - Yi Wang
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, Henan Province, China
| | - Huimin Ding
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, Henan Province, China
| | - Chunpeng Jiang
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, Henan Province, China
| | - Yao Geng
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, Henan Province, China; International Joint Laboratory of Food Safety, Zhengzhou 450000, Henan Province, China
| | - Xincheng Sun
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, Henan Province, China; International Joint Laboratory of Food Safety, Zhengzhou 450000, Henan Province, China
| | - Jianzhou Jing
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, Henan Province, China; International Joint Laboratory of Food Safety, Zhengzhou 450000, Henan Province, China
| | - Hui Gao
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, Henan Province, China; International Joint Laboratory of Food Safety, Zhengzhou 450000, Henan Province, China
| | - Zhangcun Wang
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, Henan Province, China
| | - Caiwen Dong
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, Henan Province, China
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Validation of Loop-Mediated Isothermal Amplification (LAMP) Field Tool for Rapid and Sensitive Diagnosis of Contagious Agalactia in Small Ruminants. Animals (Basel) 2020; 10:ani10030509. [PMID: 32204335 PMCID: PMC7143204 DOI: 10.3390/ani10030509] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/14/2020] [Accepted: 03/16/2020] [Indexed: 02/06/2023] Open
Abstract
Simple Summary Contagious agalactia (CA) is an infectious disease of small ruminants endemic in the Mediterranean countries, causing significant socioeconomic impacts predominantly on small-scale farmers who still subsist on marginal lands. Mycoplasma agalactiae is historically considered the principal etiological agent of CA, especially in sheep. Clinical signs are characterised by mastitis, arthritis, keratoconjunctivitis and occasionally, abortion. Rapid, accurate and cost-effective field tests are urgently needed for effective control of M. agalactiae mastitis. Our study illustrated the validation of a Loop-Mediated Isothermal Amplification (LAMP) test for the detection of M. agalactiae in dairy sheep in order to confirm its application as a diagnostic tool in the field level. Abstract Contagious agalactia (CA), an infectious disease of small ruminants, caused by Mycoplasma agalactiae, is responsible for severe losses to dairy sheep production with substantial socioeconomic impacts on small-scale farmers. The diagnosis of CA is still problematic, time-consuming and requires well-equipped labs for confirmation of outbreaks. Therefore, rapid, accurate and cost-effective diagnostic tests are urgently needed. This work aims to validate a novel Loop-Mediated Isothermal Amplification (LAMP) test, based on the p40 target gene, for the detection of M. agalactiae in dairy sheep in order to confirm its potential practical use as a rapid and cheap field test. The LAMP system proposed in this study consists of a portable device composed of real-time fluorometer with the automatic interpretation of results displayed in a tablet. A total of 110 milk samples (90 positives and 20 negatives) were analysed to optimise the analysis procedure and to investigate the efficacy and robustness of the LAMP method. All samples were analysed using LAMP and conventional real-time PCR to compare the diagnostic sensitivity of the methods. The sensitivity of the LAMP was 10-fold higher than that of real-time PCR, with a detection limit up to 103 CFU/ml. The LAMP assay was able to detect M. agalactiae in 81 of 90 (90%, 95%CI 0.84–0.96) positive milk samples compared to 69 (77%, 95%CI 0.59–0.95) positive samples detected by real-time PCR; no positive signal occurred for any of the negative milk samples in either test. Therefore, the LAMP assay was found to be more sensitive than real-time PCR, low-cost, easy to perform, fast and not affected by contamination, indicating its potential as an effective diagnostic tool in the field level for the diagnosis of CA.
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Advances in the detection of virulence genes of Staphylococcus aureus originate from food. FOOD SCIENCE AND HUMAN WELLNESS 2020. [DOI: 10.1016/j.fshw.2019.12.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Xiong J, Huang B, Xu JS, Huang WS. A Closed-Tube Loop-Mediated Isothermal Amplification Assay for the Visual Detection of Staphylococcus aureus. Appl Biochem Biotechnol 2020; 191:201-211. [DOI: 10.1007/s12010-020-03278-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 02/13/2020] [Indexed: 02/04/2023]
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Chakraborty S, Dhama K, Tiwari R, Iqbal Yatoo M, Khurana SK, Khandia R, Munjal A, Munuswamy P, Kumar MA, Singh M, Singh R, Gupta VK, Chaicumpa W. Technological interventions and advances in the diagnosis of intramammary infections in animals with emphasis on bovine population-a review. Vet Q 2020; 39:76-94. [PMID: 31288621 PMCID: PMC6830988 DOI: 10.1080/01652176.2019.1642546] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Mastitis, an inflammation of the udder, is a challenging problem in dairy animals accounting for high economic losses. Disease complexity, degree of economic losses and increasing importance of the dairy industries along with public health concerns envisages devising appropriate diagnostics of mastitis, which can offer rapid, accurate and confirmatory diagnosis. The various diagnostic tests of mastitis have been divided into general or phenotypic and specific or genotypic tests. General or phenotypic tests are those that identify general alterations, which are not specific to any pathogen. Genotypic tests are specific, hence confirmatory for diagnosis of mastitis and include specific culture, polymerase chain reaction (PCR) and its various versions (e.g. qRT-PCR), loop-mediated isothermal amplification, lateral flow assays, nucleotide sequencing, matrix-assisted laser desorption ionization time-of-flight mass spectrometry, and other molecular diagnostic methods. However, for highly specific and confirmatory diagnosis, pure cultures still provide raw materials for more sophisticated diagnostic technological interventions like PCR and nucleotide sequencing. Diagnostic ability of like infra-red thermography (IRT) has been shown to be similar to California mastitis test and also differentiates clinical mastitis from subclinical mastitis cases. As such, IRT can become a convenient and portable diagnostic tool. Of note, magnetic nanoparticles-based colorimetric biosensor assay was developed by using for instance proteolytic activity of plasmin or anti-S. aureus antibody. Last but not least, microRNAs have been suggested to be potential biomarkers for diagnosing bovine mastitis. This review summarizes the various diagnostic tests available for detection of mastitis including diagnosis through general and specific technological interventions and advances.
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Affiliation(s)
- Sandip Chakraborty
- Department of Veterinary Microbiology, College of Veterinary Sciences & Animal Husbandry , West Tripura , India
| | - Kuldeep Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute , Bareilly , India
| | - Ruchi Tiwari
- Department of Veterinary Microbiology and Immunology, College of Veterinary Sciences, Deen Dayal Upadhayay Pashu Chikitsa Vigyan Vishwavidyalay Evum Go-Anusandhan Sansthan (DUVASU) , Mathura , India
| | - Mohd Iqbal Yatoo
- Sher-E-Kashmir University of Agricultural Sciences and Technology of Kashmir , Srinagar , India
| | | | - Rekha Khandia
- Department of Biochemistry and Genetics, Barkatullah University , Bhopal , India
| | - Ashok Munjal
- Department of Biochemistry and Genetics, Barkatullah University , Bhopal , India
| | - Palanivelu Munuswamy
- Division of Pathology, ICAR-Indian Veterinary Research Institute , Bareilly , India
| | - M Asok Kumar
- Division of Pathology, ICAR-Indian Veterinary Research Institute , Bareilly , India
| | - Mithilesh Singh
- Immunology Section, ICAR-Indian Veterinary Research Institute , Bareilly , India
| | - Rajendra Singh
- Division of Pathology, ICAR-Indian Veterinary Research Institute , Bareilly , India
| | - Vivek Kumar Gupta
- Centre for Animal Disease Research and Diagnosis, ICAR-Indian Veterinary Research Institute , Bareilly , India
| | - Wanpen Chaicumpa
- Center of Research Excellence on Therapeutic Proteins and Antibody Engineering, Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University , Bangkok , Thailand
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Causes, types, etiological agents, prevalence, diagnosis, treatment, prevention, effects on human health and future aspects of bovine mastitis. Anim Health Res Rev 2020; 21:36-49. [PMID: 32051050 DOI: 10.1017/s1466252319000094] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Mastitis is among the most common and challenging diseases of dairy animals. It is an inflammation of udder tissues due to physical damage, chemical irritation, or infection caused by certain pathogens. Bovine mastitis has been known for ages, but its complex etiology and multi-factorial nature make it difficult to control. Mastitis may have a negative impact on human health by inducing antibiotic-resistant pathogens that may spread, which is threatening. Researchers are continuously struggling to devise suitable methods for mastitis control. Management strategies are mainly focused on disease prevention by farm management which includes proper hygiene, trained staff to monitor minor changes in the udder or milk, and better diagnostic and treatment methods. New technologies which have the potential to unravel this complicated disease include improved diagnostic tools, based on advanced genomics or proteomics, prevention, based on vaccines and immune modulators, and metabolic products of probiotics such as bacteriocins and gene therapy.
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Development and application of a visual loop-mediated isothermal amplification combined with lateral flow dipstick (LAMP-LFD) method for rapid detection of Salmonella strains in food samples. Food Control 2019. [DOI: 10.1016/j.foodcont.2019.04.014] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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31
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Tian X, Feng J, Wang Y. Direct loop-mediated isothermal amplification assay for on-site detection of Staphylococcus aureus. FEMS Microbiol Lett 2019; 365:4966978. [PMID: 29648586 PMCID: PMC5967525 DOI: 10.1093/femsle/fny092] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 04/08/2018] [Indexed: 01/13/2023] Open
Abstract
Staphylococcus aureus (S. aureus) is a major human pathogen that may produce a variety of toxins and cause staphylococcal food poisoning. In the present study, a direct loop-mediated isothermal amplification (LAMP) assay was developed and validated to detect S. aureus in food samples. Without prior cultural enrichment and DNA extraction steps, bacterial DNA was released by heating at 100°C for 5 min and directly subjected to LAMP assay. Using a set of LAMP primers recognizing six distinct regions of nuc gene, the developed direct LAMP assay was highly specific, and the analytical sensitivity was determined to be 7.6 × 102 CFU/mL. Moreover, with the pre-mixed LAMP reagents stored at –20°C, the entire assay should be finished within 40 min. These features greatly simplified the operating procedure and made the direct LAMP a powerful tool for rapid and on-site detection of S. aureus in food samples.
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Affiliation(s)
- Xiaolan Tian
- Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, PR China
| | - Junli Feng
- Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, PR China.,Key Lab of aquatic Products Processing of Zhejiang Province, Hangzhou 310012, PR China
| | - Yi Wang
- Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, PR China
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Detection of viable but nonculturable Vibrio parahaemolyticus in shrimp samples using improved real-time PCR and real-time LAMP methods. Food Control 2019. [DOI: 10.1016/j.foodcont.2019.04.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yang Q, Zhang Y, Li S, Lu X, Yuan Y, Zhang W. Saltatory rolling circle amplification for sensitive visual detection of Staphylococcus aureus in milk. J Dairy Sci 2019; 102:9702-9710. [PMID: 31477297 DOI: 10.3168/jds.2019-16724] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 07/07/2019] [Indexed: 01/23/2023]
Abstract
Monitoring Staphylococcus aureus with high sensitivity is very important for ensuring milk quality and food safety. In this study, we used a rapid nucleic acid isothermal amplification method, saltatory rolling circle amplification (SRCA), for the detection of Staph. aureus in milk. The results of the SRCA method can be assessed visually by the presence of white precipitate or by fluorescence measurement. Thirteen Staph. aureus strains and 31 non-Staph. aureus strains were used to evaluate the specificity of SRCA. The method exhibited excellent detection of Staph. aureus genomic DNA at a concentration of 7.8 × 101 fg/µL when assessed by visible precipitate, and at 7.8 × 100 fg/µL when detected by fluorescence after addition of the fluorochrome SYBR Green I. In artificially inoculated milk, the detection limits of SRCA were 5.6 × 102 cfu/mL by precipitate and 5.6 × 101 cfu/mL by fluorescence, respectively. Compared with conventional PCR approaches, the SRCA assay achieved at least 100-fold higher sensitivity. Moreover, the sensitivity, specificity, and accuracy of the SRCA-based system were calculated to be 100.00, 97.73, and 97.78%, respectively. These results indicate that SRCA has potential application as a sensitive and visual technique for the detection of Staph. aureus in milk.
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Affiliation(s)
- Qian Yang
- College of Science and Technology, Hebei Agricultural University, Cangzhou 061100, China
| | - Yunzhe Zhang
- College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, China
| | - Sen Li
- College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, China
| | - Xin Lu
- College of Science and Technology, Hebei Agricultural University, Cangzhou 061100, China
| | - Yaowu Yuan
- College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, China
| | - Wei Zhang
- College of Science and Technology, Hebei Agricultural University, Cangzhou 061100, China; College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, China; College of Life Sciences, Hebei Agricultural University, Baoding 071001, China.
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Martins SAM, Martins VC, Cardoso FA, Germano J, Rodrigues M, Duarte C, Bexiga R, Cardoso S, Freitas PP. Biosensors for On-Farm Diagnosis of Mastitis. Front Bioeng Biotechnol 2019; 7:186. [PMID: 31417901 PMCID: PMC6684749 DOI: 10.3389/fbioe.2019.00186] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 07/15/2019] [Indexed: 12/14/2022] Open
Abstract
Bovine mastitis is an inflammation of the mammary gland caused by a multitude of pathogens with devastating consequences for the dairy industry. Global annual losses are estimated to be around €30 bn and are caused by significant milk losses, poor milk quality, culling of chronically infected animals, and occasional deaths. Moreover, mastitis management routinely implies the administration of antibiotics to treat and prevent the disease which poses serious risks regarding the emergence of antibiotic resistance. Conventional diagnostic methods based on somatic cell counts (SCC) and plate-culture techniques are accurate in identifying the disease, the respective infectious agents and antibiotic resistant phenotypes. However, pressure exists to develop less lengthy approaches, capable of providing on-site information concerning the infection, and in this way, guide, and hasten the most adequate treatment. Biosensors are analytical tools that convert the presence of biological compounds into an electric signal. Benefitting from high signal-to-noise ratios and fast response times, when properly tuned, they can detect the presence of specific cells and cell markers with high sensitivity. In combination with microfluidics, they provide the means for development of automated and portable diagnostic devices. Still, while biosensors are growing at a fast pace in human diagnostics, applications for the veterinary market, and specifically, for the diagnosis of mastitis remain limited. This review highlights current approaches for mastitis diagnosis and describes the latest outcomes in biosensors and lab-on-chip devices with the potential to become real alternatives to standard practices. Focus is given to those technologies that, in a near future, will enable for an on-farm diagnosis of mastitis.
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Affiliation(s)
- Sofia A. M. Martins
- Magnomics S.A., Parque Tecnológico de Cantanhede, Cantanhede, Portugal
- INESC Microsistemas e Nanotecnologias Rua Alves Redol, Lisbon, Portugal
| | - Verónica C. Martins
- Magnomics S.A., Parque Tecnológico de Cantanhede, Cantanhede, Portugal
- INESC Microsistemas e Nanotecnologias Rua Alves Redol, Lisbon, Portugal
| | - Filipe A. Cardoso
- Magnomics S.A., Parque Tecnológico de Cantanhede, Cantanhede, Portugal
| | - José Germano
- Magnomics S.A., Parque Tecnológico de Cantanhede, Cantanhede, Portugal
| | - Mónica Rodrigues
- Magnomics S.A., Parque Tecnológico de Cantanhede, Cantanhede, Portugal
- Faculdade de Ciências, CE3C - Centre for Ecology, Evolution and Environmental Changes, Universidade de Lisboa, Lisbon, Portugal
| | - Carla Duarte
- INESC Microsistemas e Nanotecnologias Rua Alves Redol, Lisbon, Portugal
- Faculdade de Medicina Veterinária, Avenida da Universidade Técnica, Lisbon, Portugal
| | - Ricardo Bexiga
- Faculdade de Medicina Veterinária, Avenida da Universidade Técnica, Lisbon, Portugal
| | - Susana Cardoso
- INESC Microsistemas e Nanotecnologias Rua Alves Redol, Lisbon, Portugal
| | - Paulo P. Freitas
- INESC Microsistemas e Nanotecnologias Rua Alves Redol, Lisbon, Portugal
- INL- International Iberian Nanotechnology Laboratory, Braga, Portugal
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Tang J, Wang Z, Zhou J, Lu Q, Deng L. Enzyme-free hybridization chain reaction-based signal amplification strategy for the sensitive detection of Staphylococcus aureus. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 215:41-47. [PMID: 30818216 DOI: 10.1016/j.saa.2019.02.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 02/16/2019] [Accepted: 02/16/2019] [Indexed: 06/09/2023]
Abstract
In this study, based on hybridization chain reaction (HCR) amplification and graphene oxide (GO), we developed a facile enzyme-free signal amplification strategy for sensitive detection of Staphylococcus aureus (S. aureus). Two hairpin probes (HP1 and HP2) labeled by fluorophore 6-carboxyfluorescein (FAM) are designed. The HP1 and HP2 can not only trigger to the HCR but also form a long nicked double strand DNA (dsDNA) with the target (16S rRNA). In the absence of target (16 s RNA), the free FAM-labeled HP1 and HP2 are adsorbed by the GO via π-π stacking, the fluorescence signal is quenched. In the presence of target (16 s RNA), the HCR is triggered and dsDNA complexes are generated. As a result, the fluorescence signal can be strongly amplified by the synergistic effect of FAM and the dsDNA dye SYBR Green I. Based on this mechanism, a fluorescence method is designed for the detection of 16S rRNA of S. aureus. Under the optimal conditions, it has low detection limit (50 pM) and a linear response in a concentration range of 50 pM to 100 nM for 16S rRNA. Furthermore, this method has also been successfully applied to the detection of S. aureus in milk sample with the detection limit of 4 × 102 CFU·mL-1.
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Affiliation(s)
- Jie Tang
- State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410081, Hunan, People's Republic of China
| | - Zefeng Wang
- State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410081, Hunan, People's Republic of China
| | - Jiaqi Zhou
- State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410081, Hunan, People's Republic of China
| | - Qiujun Lu
- State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410081, Hunan, People's Republic of China
| | - Le Deng
- State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha 410081, Hunan, People's Republic of China.
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Cai R, Yin F, Zhang Z, Tian Y, Zhou N. Functional chimera aptamer and molecular beacon based fluorescent detection of Staphylococcus aureus with strand displacement-target recycling amplification. Anal Chim Acta 2019; 1075:128-136. [PMID: 31196418 DOI: 10.1016/j.aca.2019.05.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Revised: 04/17/2019] [Accepted: 05/05/2019] [Indexed: 01/09/2023]
Abstract
A fluorescent detection of Staphylococcus aureus (S. aureus) is established based on a finely designed functional chimera sequence, a molecular beacon (MB), and strand displacement target recycling. The chimera sequence, which consists of the aptamer sequence of S. aureus and the complementary sequence of MB, can form a hairpin structure due to the existence of intramolecular complementary regions. When S. aureus is present, it binds to the aptamer region of the chimera, opens the hairpin and unlocks the complementary sequence of MB. Subsequently, the MB is opened and intensive fluorescence signal is restored. To increase the sensitivity of the detection, signal amplification is achieved through strand displacement-based target recycling. With the catalysis of Nb. Bpu10I nicking endonuclease and Bsm DNA polymerase, the MB sequence can be cleaved and then elongated to form a complete duplex with the chimera, during which S. aureus is displaced from the chimera and proceeded to the next round of the reaction. This assay displays a linear correlation between the fluorescence intensity and the logarithm of the concentration of S. aureus within a broad concentration range from 80 CFU/mL to 8 × 106 CFU/mL. The detection limit of 39 CFU/mL can be derived. The assay was applied to detect S. aureus in different water samples, and satisfactory recovery and repeatability were achieved. Hence the designed chimera sequence and established assay have potential application in environmental pollution monitoring.
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Affiliation(s)
- Rongfeng Cai
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Fan Yin
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Zhongwen Zhang
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Yaping Tian
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Nandi Zhou
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China.
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Pang B, Fu K, Liu Y, Ding X, Hu J, Wu W, Xu K, Song X, Wang J, Mu Y, Zhao C, Li J. Development of a self-priming PDMS/paper hybrid microfluidic chip using mixed-dye-loaded loop-mediated isothermal amplification assay for multiplex foodborne pathogens detection. Anal Chim Acta 2018; 1040:81-89. [DOI: 10.1016/j.aca.2018.07.024] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 07/03/2018] [Accepted: 07/10/2018] [Indexed: 11/26/2022]
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38
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Yang Q, Zhang Y, Li C, Zhao Y, Ma X, Zhang W, Zhang S. A Rapid and Visual Single Primer Isothermal Amplification-Based Method for the Detection of Staphylococcus aureus in Raw Pork Products. FOOD ANAL METHOD 2018. [DOI: 10.1007/s12161-018-1294-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Gong J, Zhuang L, Zhang D, Zhang P, Dou X, Wang C. Establishment of a Multiplex Loop-Mediated Isothermal Amplification Method for Rapid Detection of Sulfonamide Resistance Genes (sul1, sul2, sul3) in Clinical Enterobacteriaceae Isolates from Poultry. Foodborne Pathog Dis 2018; 15:413-419. [PMID: 29708802 DOI: 10.1089/fpd.2017.2410] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Antimicrobial resistance genes play an important role in mediating resistance to sulfonamide in Gram-negative bacteria. While PCR is the current method to detect sulfonamide resistance genes (sul1, sul2, sul3), it is time-consuming and costly and there is an urgent need to develop a more convenient, simpler and rapid test for the sul. In this study, we describe a multiplex loop-mediated isothermal amplification (m-LAMP) assay we developed for the rapid and simultaneous detection of three sul. This m-LAMP assay successfully detected seven reference strains with different sul genotypes, but was negative for nine sul-negative reference strains. The m-LAMP products were verified by HinfI restriction enzyme digestion and the detection limit of the test was 0.5 pg genomic DNA per reaction. Testing 307 sulfonamide-resistant Enterobacteriaceae clinical isolates with the m-LAMP revealed all were positive for the sul with sul2 (79.5%) and sul1 (64.5%) being most prevalent, and sul3 the least (12.1%). Of the Enterobacteriaceae isolates tested, the Salmonella Indiana, a newly emerging serovar resistant to numerous antimicrobials, were most commonly positive with 33% having sul3.
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Affiliation(s)
- Jiansen Gong
- 1 Poultry Institute , Chinese Academy of Agricultural Sciences, Yangzhou, China
- 2 Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Yangzhou University , Yangzhou, Jiangsu, China
| | - Linlin Zhuang
- 3 State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering, Southeast University , Nanjing, China
| | - Di Zhang
- 1 Poultry Institute , Chinese Academy of Agricultural Sciences, Yangzhou, China
| | - Ping Zhang
- 1 Poultry Institute , Chinese Academy of Agricultural Sciences, Yangzhou, China
| | - Xinhong Dou
- 1 Poultry Institute , Chinese Academy of Agricultural Sciences, Yangzhou, China
- 2 Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Yangzhou University , Yangzhou, Jiangsu, China
| | - Chengming Wang
- 4 College of Veterinary Medicine, Auburn University , Auburn, Alabama
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Klaas IC, Zadoks RN. An update on environmental mastitis: Challenging perceptions. Transbound Emerg Dis 2017; 65 Suppl 1:166-185. [PMID: 29083115 DOI: 10.1111/tbed.12704] [Citation(s) in RCA: 125] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Indexed: 12/15/2022]
Abstract
Environmental mastitis is the most common and costly form of mastitis in modern dairy herds where contagious transmission of intramammary pathogens is controlled through implementation of standard mastitis prevention programmes. Environmental mastitis can be caused by a wide range of bacterial species, and binary classification of species as contagious or environmental is misleading, particularly for Staphylococcus aureus, Streptococcus uberis and other streptococcal species, including Streptococcus agalactiae. Bovine faeces, the indoor environment and used pasture are major sources of mastitis pathogens, including Escherichia coli and S. uberis. A faeco-oral transmission cycle may perpetuate and amplify the presence of such pathogens, including Klebsiella pneumoniae and S. agalactiae. Because of societal pressure to reduce reliance on antimicrobials as tools for mastitis control, management of environmental mastitis will increasingly need to be based on prevention. This requires a reduction in environmental exposure through bedding, pasture and pre-milking management and enhancement of the host response to bacterial challenge. Efficacious vaccines are available to reduce the impact of coliform mastitis, but vaccine development for gram-positive mastitis has not progressed beyond the "promising" stage for decades. Improved diagnostic tools to identify causative agents and transmission patterns may contribute to targeted use of antimicrobials and intervention measures. The most important tool for improved uptake of known mastitis prevention measures is communication. Development of better technical or biological tools for management of environmental mastitis must be accompanied by development of appropriate incentives and communication strategies for farmers and veterinarians, who may be confronted with government-mandated antimicrobial use targets if voluntary reduction is not implemented.
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Affiliation(s)
- I C Klaas
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg C, Denmark
| | - R N Zadoks
- Moredun Research Institute, Penicuik, UK.,Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
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Rainard P, Foucras G, Fitzgerald JR, Watts JL, Koop G, Middleton JR. Knowledge gaps and research priorities in Staphylococcus aureus mastitis control. Transbound Emerg Dis 2017; 65 Suppl 1:149-165. [PMID: 28984427 DOI: 10.1111/tbed.12698] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Indexed: 12/31/2022]
Abstract
This study assessed knowledge gaps and suggested research priorities in the field of Staphylococcus aureus mastitis. Staphylococcus aureus infecting the mammary gland remains a major problem to the dairy industry worldwide because of its pathogenicity, contagiousness, persistence in the cow environment, colonization of skin or mucosal epithelia, and the poor curing efficacy of treatments. Staphylococcus aureus also constitutes a threat to public health due to food safety and antibiotic usage issues and the potential for bidirectional transmission of strains between humans and dairy animals (cows and small ruminants). Gaps have been identified in (i) understanding the molecular basis for pathogenesis of S. aureus mastitis, (ii) identifying staphylococcal antigens inducing protection and (iii) determining the cell-mediated immune responses to infection and vaccination. The recommended priorities for research are (i) improved diagnostic methods for early detection of infection and intervention through treatment or management, (ii) development of experimental models to investigate the strategies used by S. aureus to survive within the mammary gland and resist treatment with anti-microbials, (iii) investigation of the basis for cow-to-cow variation in response to S. aureus mastitis, (iv) identification of the immune responses (adaptive and innate) induced by infection or vaccination and (v) antibacterial discovery programmes to develop new, more effective, narrow spectrum antibacterial agents for the treatment of S. aureus mastitis. With the availability and ongoing improvement of molecular research tools, these objectives may not be out of reach in the future.
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Affiliation(s)
- P Rainard
- ISP, INRA, Université de Tours, UMR1282, Nouzilly, France
| | - G Foucras
- IHAP, Université de Toulouse, INRA, ENVT, Toulouse, France
| | - J R Fitzgerald
- The Roslin Institute, University of Edinburgh, Edinburgh, UK
| | - J L Watts
- Zoetis, External Innovation-Anti-Infectives, VMRD, Kalamazoo, MI, USA
| | - G Koop
- Veterinary Medicine, University of Utrecht, Utrecht, The Netherlands
| | - J R Middleton
- Department of Veterinary Medicine and Surgery, University of Missouri, Columbia, MO, USA
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Moreira MG, Barreto LM, Dos Santos VL, Monteiro AS, Nobre V, Dos Santos SG. Rapid detection of the New Delhi metallo-b-lactamase 1 (NDM-1) gene by loop-mediated isothermal amplification (LAMP). J Clin Lab Anal 2017; 32:e22323. [PMID: 28960568 DOI: 10.1002/jcla.22323] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 08/15/2017] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND New Delhi Metallo-b-lactamase (NDM-1) is an enzyme emerging around the world conferring resistance to a wide range of β-lactams agents and whose early detection is extremely important. We proposed to standardize the detection of the blaNDM-1 gene using the LOOP-mediated isothermal amplification technique (LAMP). METHODS In all, 14 Gram-negative bacterial strains isolated from patients presenting pneumonia associated with mechanical ventilation were used for the blaNDM-1 standardization by LAMP. Klebsiella pneumoniae ATCC BAA-2473 and two clinical strains were used as a positive control. All results were compared to the reaction in polymerase chain reaction (PCR), considered gold standard for this detection. RESULTS There was an excellent correlation between the two techniques employed, since all measured clinical strains were negative in both employed tests and two clinical, and a reference strains were positive. CONCLUSIONS The lamp technique seems to be an excellent option for the rapid detection of blaNDM-1. The amplification time is much shorter than other molecular techniques, the PCR machine is not necessary, it is easy of implementation and costs is low.
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Affiliation(s)
- Mirna Giselle Moreira
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil
| | | | - Vera Lúcia Dos Santos
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil
| | - Andrea Souza Monteiro
- Departamento de Parasitologia e Biologia, Centro Universitário do Maranhão, São Luís, Brasil
| | - Vandack Nobre
- Programa de Pós Graduação em Infectologia e Medicina Tropical, Faculdade de Medicina, Universidade Federal de Minas, Belo Horizonte, Brasil
| | - Simone Gonçalves Dos Santos
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil
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Heers T, van Neer A, Becker A, Grilo ML, Siebert U, Abdulmawjood A. Loop-mediated isothermal amplification (LAMP) assay-A rapid detection tool for identifying red fox (Vulpes vulpes) DNA in the carcasses of harbour porpoises (Phocoena phocoena). PLoS One 2017; 12:e0184349. [PMID: 28863185 PMCID: PMC5581184 DOI: 10.1371/journal.pone.0184349] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 08/22/2017] [Indexed: 11/18/2022] Open
Abstract
Carcasses of wild animals are often visited by different scavengers. However, determining which scavenger caused certain types of bite marks is particularly difficult and knowledge thereof is lacking. Therefore, a loop-mediated isothermal amplification (LAMP) assay (target sequence cytochrome b) was developed to detect red fox DNA in carcasses of harbour porpoises. The MSwab™ method for direct testing without prior DNA isolation was validated. As a detection device, the portable real-time fluorometer Genie® II was used, which yields rapid results and can be used in field studies without huge laboratory equipment. In addition to in vitro evaluation and validation, a stranded and scavenged harbour porpoise carcass was successfully examined for red fox DNA residues. The developed LAMP method is a valuable diagnostic tool for confirming presumable red fox bite wounds in harbour porpoises without further DNA isolation steps.
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Affiliation(s)
- Teresa Heers
- Institute for Food Quality and Food Safety, Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
| | - Abbo van Neer
- Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
| | - André Becker
- Institute for Food Quality and Food Safety, Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
| | - Miguel Luca Grilo
- Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
| | - Ursula Siebert
- Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
| | - Amir Abdulmawjood
- Institute for Food Quality and Food Safety, Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
- * E-mail:
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Lin Q, Xu P, Li J, Chen Y, Feng J. Direct bacterial loop-mediated isothermal amplification detection on the pathogenic features of the nosocomial pathogen - Methicillin resistant Staphylococcus aureus strains with respiratory origins. Microb Pathog 2017; 109:183-188. [PMID: 28578093 DOI: 10.1016/j.micpath.2017.05.044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 05/24/2017] [Accepted: 05/30/2017] [Indexed: 01/25/2023]
Abstract
Loop-mediated isothermal amplification based detection assays using bacterial culture or colony for direct detection of methicillin resistant Staphylococcus aureus(MRSA) had been developed and evaluated, followed by its extensive application on a large scale of clinical MRSA isolated from respiratory origins, including nasal swabs and sputums. Six primers, including outer primers, inner primers and loop primers, were specifically designed for recognizing eight distinct sequences on four targets: 16SrRNA, femA, mecA and orfX. Twenty-seven reference strains were used to develop, evaluate and optimize this assay. Then, a total of 532 clinical MRSA isolates were employed for each detected targets. And the results were determined through both visual observation of the color change by naked eye and electrophoresis. The specific of each primer had been confirmed, and the optimal amplification was obtained under 65 °C for 40 min. The limit of detections (LOD) of bacteria culture LAMP assays were determined to be 104 CFU/ml for 16S rRNA, femA, as well as orfX and 105 CFU/ml for mecA, respectively. The established novel assays on MRSA detection may provide new strategies for rapid detection of foodborne pathogens.
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Affiliation(s)
- Qun Lin
- Lecong Hospital Affiliated of Guangzhou Medical University, Shunde District, Foshan 528315, Guangdong province, China
| | - Pusheng Xu
- Lecong Hospital Affiliated of Guangzhou Medical University, Shunde District, Foshan 528315, Guangdong province, China.
| | - Jiaowu Li
- Lecong Hospital Affiliated of Guangzhou Medical University, Shunde District, Foshan 528315, Guangdong province, China
| | - Yin Chen
- Lecong Hospital Affiliated of Guangzhou Medical University, Shunde District, Foshan 528315, Guangdong province, China
| | - Jieyi Feng
- Lecong Hospital Affiliated of Guangzhou Medical University, Shunde District, Foshan 528315, Guangdong province, China
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Henares D, Brotons P, Buyse X, Latorre I, de Paz HD, Muñoz-Almagro C. Evaluation of the eazyplex MRSA assay for the rapid detection of Staphylococcus aureus in pleural and synovial fluid. Int J Infect Dis 2017; 59:65-68. [PMID: 28450195 DOI: 10.1016/j.ijid.2017.04.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 04/07/2017] [Accepted: 04/13/2017] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE Loop-mediated isothermal amplification (LAMP) is a simple and sensitive technique for rapid microbiological diagnosis. The aim of this study was to evaluate the analytical and diagnostic performance of the LAMP eazyplex MRSA test for the direct detection and differentiation of methicillin-susceptible (MSSA) and methicillin-resistant Staphylococcus aureus (MRSA) in synovial/pleural fluid. METHODS Analytical validation included the determination of the limit of detection (LoD) and analytical specificity of the eazyplex MRSA test. A diagnostic evaluation of the eazyplex test against bacterial culture was performed on routine pleural/synovial samples collected prospectively from patients aged less than 18 years with complicated pneumonia with empyema or arthritis admitted to the Children's Hospital Sant Joan de Déu in Barcelona, Spain, between April 2015 and May 2016. RESULTS The new system appropriately detected a quality control panel of clinical samples with DNA of MSSA, MRSA, and other pathogens. The LoD was established at 6.4×103 CFU/ml for S. aureus and 1.0×104 CFU/ml for MRSA. Diagnostic validation of the eazyplex MRSA assay was performed on 51 prospective clinical invasive samples, resulting in sensitivity and specificity values of 83.3% and 97.8%, respectively, for S. aureus detection. The mean turnaround time was 70min. CONCLUSIONS The eazyplex MRSA assay was found to be a useful test for the rapid detection of S. aureus in invasive samples such as pleural/synovial fluid.
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Affiliation(s)
- D Henares
- Institut de Recerca Pediàtrica, Departament de Microbiologia Molecular, Hospital Sant Joan de Déu, Barcelona, Spain
| | - P Brotons
- Institut de Recerca Pediàtrica, Departament de Microbiologia Molecular, Hospital Sant Joan de Déu, Barcelona, Spain; CIBER de Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain
| | - X Buyse
- Institut de Recerca Pediàtrica, Departament de Microbiologia Molecular, Hospital Sant Joan de Déu, Barcelona, Spain
| | - I Latorre
- Institut de Recerca Pediàtrica, Departament de Microbiologia Molecular, Hospital Sant Joan de Déu, Barcelona, Spain; Institut d'Investigació Germans Trias i Pujol, Badalona, CIBER de Enfermedades Respiratorias (CIBERES), Barcelona, Spain
| | - H D de Paz
- Institut de Recerca Pediàtrica, Departament de Microbiologia Molecular, Hospital Sant Joan de Déu, Barcelona, Spain
| | - C Muñoz-Almagro
- Institut de Recerca Pediàtrica, Departament de Microbiologia Molecular, Hospital Sant Joan de Déu, Barcelona, Spain; CIBER de Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain; Universitat Internacional de Catalunya, School of Medicine, Barcelona, Spain.
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Li Y, Fan P, Zhou S, Zhang L. Loop-mediated isothermal amplification (LAMP): A novel rapid detection platform for pathogens. Microb Pathog 2017; 107:54-61. [PMID: 28323152 DOI: 10.1016/j.micpath.2017.03.016] [Citation(s) in RCA: 134] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 03/07/2017] [Accepted: 03/16/2017] [Indexed: 12/12/2022]
Abstract
Foodborne bacterial infections and diseases have been considered to be a major threat for public health in the worldwide. Increased incidence of human diseases caused by foodborne pathogens have been correlated with growing world population and mobility. Loop-mediated isothermal amplification (LAMP) has been regarded as an innovative gene amplification technology and emerged as an alternative to PCR-based methodologies in both clinical laboratory and food safety testing. Nowadays, LAMP has been applied to detection and identification on pathogens from microbial diseases, as it showed significant advantage in high sensitivity, specificity and rapidity. The high sensitivity of LAMP enables detection of the pathogens in sample materials even without time consuming sample preparation. An overview of LAMP mainly containing the development history, reaction principle and its application to four kind of foodborne pathogens detection are presented in this paper. As concluded, with the advantages of rapidity, simplicity, sensitivity, specificity and robustness, LAMP is capable of applications for clinical diagnosis as well as surveillance of infection diseases. Moreover, the main purpose of this paper is to provide theoretical basis for the clinical application of LAMP technology.
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Affiliation(s)
- Yanmei Li
- Department of Haematology, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou 510623, PR China.
| | - Penghui Fan
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China.
| | - Shishui Zhou
- School of Bioscience and Bioengineering, South China University of Technology, 382 Zhonghuan Road East, Guangzhou 510006, PR China.
| | - Li Zhang
- Department of Haematology, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou 510623, PR China.
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