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Minutillo R, Pirard B, Fatihi A, Cavaiuolo M, Lefebvre D, Gérard A, Taminiau B, Nia Y, Hennekinne JA, Daube G, Clinquart A. The Enterotoxin Gene Profiles and Enterotoxin Production of Staphylococcus aureus Strains Isolated from Artisanal Cheeses in Belgium. Foods 2023; 12:4019. [PMID: 37959138 PMCID: PMC10650413 DOI: 10.3390/foods12214019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 10/26/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023] Open
Abstract
A Staphyloccoccus aureus is one of the leading causes of food poisoning outbreaks (FPOs) worldwide. Staphylococcal food poisoning (SFP) is induced by the ingestion of food containing sufficient levels of staphylococcal enterotoxins (SEs). Currently, 33 SEs and SE-like toxins (SEls) have been described in the literature, but only five named "classical" enterotoxins are commonly investigated in FPOs due to lack of specific routine analytical techniques. The aims of this study were to (i) establish the genetic profile of strains in a variety of artisanal cheeses (n = 30) in Belgium, (ii) analyze the expression of the SE(l)s by these strains and (iii) compare the output derived from the different analytical tools. Forty-nine isolates of S. aureus were isolated from ten Belgian artisanal cheeses and were analyzed via microbiological, immunological, liquid chromatography mass spectrometry, molecular typing and genetic methods. The results indicated that classical SEs were not the dominant SEs in the Belgian artisanal cheeses that were analyzed in this study, and that all S. aureus isolates harbored at least one gene encoding a new SE(l). Among the new SE(l)s genes found, some of them code for enterotoxins with demonstrated emetic activity and ecg-enterotoxins. It is worth noting that the involvement of some of these new SEs has been demonstrated in SFP outbreaks. Thus, this study highlighted the importance of the development of specific techniques for the proper investigation of SFP outbreaks.
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Affiliation(s)
- Raphaëlle Minutillo
- Department of Food Sciences, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medecine, Avenue de Cureghem 10, 4000 Liege, Belgium (B.P.); (B.T.); (G.D.)
| | - Barbara Pirard
- Department of Food Sciences, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medecine, Avenue de Cureghem 10, 4000 Liege, Belgium (B.P.); (B.T.); (G.D.)
| | - Abdelhak Fatihi
- Laboratory for Food Safety, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Université Paris-Est, 94700 Maisons-Alfort, France; (A.F.); (M.C.); (D.L.); (Y.N.); (J.-A.H.)
| | - Marina Cavaiuolo
- Laboratory for Food Safety, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Université Paris-Est, 94700 Maisons-Alfort, France; (A.F.); (M.C.); (D.L.); (Y.N.); (J.-A.H.)
| | - Donatien Lefebvre
- Laboratory for Food Safety, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Université Paris-Est, 94700 Maisons-Alfort, France; (A.F.); (M.C.); (D.L.); (Y.N.); (J.-A.H.)
| | - Amaury Gérard
- Brewing and Food Science Unit, LABIRIS, Avenue Emile Gryzon 1, 1070 Anderlecht, Belgium;
| | - Bernard Taminiau
- Department of Food Sciences, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medecine, Avenue de Cureghem 10, 4000 Liege, Belgium (B.P.); (B.T.); (G.D.)
| | - Yacine Nia
- Laboratory for Food Safety, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Université Paris-Est, 94700 Maisons-Alfort, France; (A.F.); (M.C.); (D.L.); (Y.N.); (J.-A.H.)
| | - Jacques-Antoine Hennekinne
- Laboratory for Food Safety, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Université Paris-Est, 94700 Maisons-Alfort, France; (A.F.); (M.C.); (D.L.); (Y.N.); (J.-A.H.)
| | - Georges Daube
- Department of Food Sciences, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medecine, Avenue de Cureghem 10, 4000 Liege, Belgium (B.P.); (B.T.); (G.D.)
| | - Antoine Clinquart
- Department of Food Sciences, Fundamental and Applied Research for Animals & Health (FARAH), Faculty of Veterinary Medecine, Avenue de Cureghem 10, 4000 Liege, Belgium (B.P.); (B.T.); (G.D.)
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Lim KL, Khor WC, Ong KH, Timothy L, Aung KT. Occurrence and Patterns of Enterotoxin Genes, spa Types and Antimicrobial Resistance Patterns in Staphylococcus aureus in Food and Food Contact Surfaces in Singapore. Microorganisms 2023; 11:1785. [PMID: 37512957 PMCID: PMC10386305 DOI: 10.3390/microorganisms11071785] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/12/2023] [Accepted: 07/08/2023] [Indexed: 07/30/2023] Open
Abstract
Staphylococcus aureus contamination of food and food contact surfaces is a public health concern given its virulent and antimicrobial-resistant properties worldwide. In this study, a total of 181 MSSA isolates were analyzed for SE genes, antimicrobial resistance patterns, and spa types. Overall, 24.9% of isolates were positive for SE gene detection, with sea being the most prevalent classical SE (18.8%). The most predominant sample sources for SE gene contamination were hand swabs for sea (6/48), meat dishes for seb (3/14) and seafood dishes for sec (2/24). Antimicrobial resistance was also observed at relatively high frequencies for the clinically important antibiotics penicillin G and ampicillin (both 54.7%), followed by tetracycline (14.9%) and azithromycin (8.8%). In addition, characterization of spa types revealed spa type t5078 to be the most predominant (40.3%), with significant associations between spa types t127 and t5521 and the sea gene. This study offers insights into the enterotoxin gene and antimicrobial resistance profiles of S. aureus in cooked or ready-to-eat food to inform future surveillance and epidemiological studies.
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Affiliation(s)
- Ker Li Lim
- National Centre for Food Science, Singapore Food Agency, 7 International Business Park, Techquest, Singapore 609919, Singapore
| | - Wei Ching Khor
- National Centre for Food Science, Singapore Food Agency, 7 International Business Park, Techquest, Singapore 609919, Singapore
| | - Kar Hui Ong
- National Centre for Food Science, Singapore Food Agency, 7 International Business Park, Techquest, Singapore 609919, Singapore
| | - Lois Timothy
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Dr, Singapore 637551, Singapore
| | - Kyaw Thu Aung
- National Centre for Food Science, Singapore Food Agency, 7 International Business Park, Techquest, Singapore 609919, Singapore
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Dr, Singapore 637551, Singapore
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Bencardino D, Amagliani G, Brandi G. Carriage of Staphylococcus aureus among food handlers: An ongoing challenge in public health. Food Control 2021. [DOI: 10.1016/j.foodcont.2021.108362] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Hait JM, Cao G, Kastanis G, Yin L, Pettengill JB, Tallent SM. Evaluation of Virulence Determinants Using Whole-Genome Sequencing and Phenotypic Biofilm Analysis of Outbreak-Linked Staphylococcus aureus Isolates. Front Microbiol 2021. [PMID: 34349741 DOI: 10.3389/fmicb2021687625] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
Biofilms are a frequent cause of food contamination of potentially pathogenic bacteria, such as Staphylococcus aureus. Given its vast role in human disease, the possible impact of biofilm-producing S. aureus isolates in a food processing environment is evident. Sixty-nine S. aureus isolates collected from one firm following multiple staphylococcal food poisoning outbreak investigations were utilized for this analysis. Strain evaluations were performed to establish virulence determinants and the evolutionary relationships using data generated by shotgun whole-genome sequencing (WGS), along with end point polymerase chain reaction (PCR) and in vitro phenotypic assessments. S. aureus isolates were grouped into six well-supported clades in the phylogenetic tree, with the relationships within the clades indicating a strong degree of clonal structure. Our analysis identified four major sequence types 47.8% ST1, 31.9% ST45, 7.2% ST5, and 7.2% ST30 and two major spa types 47.8% t127 and 29.0% t3783. Extrapolated staphylococcal enterotoxin (SE) analysis found that all isolates were positive for at least 1 of the 23 SEs and/or SE-like toxin genes. Enterotoxigenic assessments found that 93% of the isolates expressed a classical SE(A-E). SE gene concurrence was observed at 96.2%, based on PCR and WGS results. In total, 46 gene targets were distinguished. This included genes that encode for adhesion and biofilm synthesis such as clfA, clfB, bbp, ebpS, ica, bap and agr. Our evaluation found agr group III to be the most prevalent at 55%, followed by 35% for agr group I. All isolates harbored the complete intercellular adhesion operon that is recognized to contain genes responsible for the adhesion step of biofilm formation by encoding proteins involved in the syntheses of the biofilm matrix. Phenotypic characterization of biofilm formation was evaluated three times, with each test completed in triplicate and accomplished utilizing the microtiter plate method and Congo red agar (CRA). The microtiter plate results indicated moderate to high biofilm formation for 96% of the isolates, with 4% exhibiting weak to no biofilm development. CRA results yielded all positive to intermediate results. The potential to inadvertently transfer pathogenic bacteria from the environment into food products creates challenges to any firm and may result in adulterated food.
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Affiliation(s)
- Jennifer M Hait
- Division of Microbiology, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Regulatory Science, College Park, MD, United States
| | - Guojie Cao
- Division of Microbiology, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Regulatory Science, College Park, MD, United States
| | - George Kastanis
- Division of Microbiology, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Regulatory Science, College Park, MD, United States
| | - Lanlan Yin
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Analytics and Outreach, College Park, MD, United States
| | - James B Pettengill
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Analytics and Outreach, College Park, MD, United States
| | - Sandra M Tallent
- Division of Microbiology, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Regulatory Science, College Park, MD, United States
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Hait JM, Cao G, Kastanis G, Yin L, Pettengill JB, Tallent SM. Evaluation of Virulence Determinants Using Whole-Genome Sequencing and Phenotypic Biofilm Analysis of Outbreak-Linked Staphylococcus aureus Isolates. Front Microbiol 2021; 12:687625. [PMID: 34349741 PMCID: PMC8328053 DOI: 10.3389/fmicb.2021.687625] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/24/2021] [Indexed: 01/22/2023] Open
Abstract
Biofilms are a frequent cause of food contamination of potentially pathogenic bacteria, such as Staphylococcus aureus. Given its vast role in human disease, the possible impact of biofilm-producing S. aureus isolates in a food processing environment is evident. Sixty-nine S. aureus isolates collected from one firm following multiple staphylococcal food poisoning outbreak investigations were utilized for this analysis. Strain evaluations were performed to establish virulence determinants and the evolutionary relationships using data generated by shotgun whole-genome sequencing (WGS), along with end point polymerase chain reaction (PCR) and in vitro phenotypic assessments. S. aureus isolates were grouped into six well-supported clades in the phylogenetic tree, with the relationships within the clades indicating a strong degree of clonal structure. Our analysis identified four major sequence types 47.8% ST1, 31.9% ST45, 7.2% ST5, and 7.2% ST30 and two major spa types 47.8% t127 and 29.0% t3783. Extrapolated staphylococcal enterotoxin (SE) analysis found that all isolates were positive for at least 1 of the 23 SEs and/or SE-like toxin genes. Enterotoxigenic assessments found that 93% of the isolates expressed a classical SE(A–E). SE gene concurrence was observed at 96.2%, based on PCR and WGS results. In total, 46 gene targets were distinguished. This included genes that encode for adhesion and biofilm synthesis such as clfA, clfB, bbp, ebpS, ica, bap and agr. Our evaluation found agr group III to be the most prevalent at 55%, followed by 35% for agr group I. All isolates harbored the complete intercellular adhesion operon that is recognized to contain genes responsible for the adhesion step of biofilm formation by encoding proteins involved in the syntheses of the biofilm matrix. Phenotypic characterization of biofilm formation was evaluated three times, with each test completed in triplicate and accomplished utilizing the microtiter plate method and Congo red agar (CRA). The microtiter plate results indicated moderate to high biofilm formation for 96% of the isolates, with 4% exhibiting weak to no biofilm development. CRA results yielded all positive to intermediate results. The potential to inadvertently transfer pathogenic bacteria from the environment into food products creates challenges to any firm and may result in adulterated food.
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Affiliation(s)
- Jennifer M Hait
- Division of Microbiology, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Regulatory Science, College Park, MD, United States
| | - Guojie Cao
- Division of Microbiology, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Regulatory Science, College Park, MD, United States
| | - George Kastanis
- Division of Microbiology, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Regulatory Science, College Park, MD, United States
| | - Lanlan Yin
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Analytics and Outreach, College Park, MD, United States
| | - James B Pettengill
- Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Analytics and Outreach, College Park, MD, United States
| | - Sandra M Tallent
- Division of Microbiology, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, Office of Regulatory Science, College Park, MD, United States
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Haghi F, Zeighami H, Hajiloo Z, Torabi N, Derakhshan S. High frequency of enterotoxin encoding genes of Staphylococcus aureus isolated from food and clinical samples. JOURNAL OF HEALTH, POPULATION, AND NUTRITION 2021; 40:27. [PMID: 34108048 PMCID: PMC8188718 DOI: 10.1186/s41043-021-00246-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 04/22/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Staphylococcus aureus is recognized as an important cause of food poisoning related to the consumption of raw, undercooked, or mishandled foods worldwide. METHODS A total of 90 individual meat samples and 200 clinical specimens were collected and investigated the frequency of S. aureus and classical enterotoxin genes. The samples were cultured on Baird-Parker and Mannitol salt agar and subjected for confirmatory biochemical tests and molecular detection of femA, sea, seb, sec, sed, and see genes. RESULTS A total of 31 (34.5%) meat samples and 81 (40.5%) clinical specimens were positive for the presence of S. aureus. These isolates were detected with slightly higher frequency in clinical specimens than food samples (P> 0.05). Furthermore, the frequency of S. aureus in raw meat (23.4%) was higher than that in cooked meat samples (11.1%) (P< 0.05). Staphylococcal enterotoxin (SE) genes were identified in 18 (58.1%) of 31 meat isolates and 42 (51.8%) of 81 clinical isolates. The frequency of SE genes (except see) in meat isolates was slightly higher than that in clinical isolates (P> 0.05). We found sea and see genes with higher frequency than others in both meat and clinical samples. Furthermore, 55.5% of meat isolates and 38.1% of clinical isolates possessed more than one se gene. CONCLUSION Detection of enterotoxigenic S. aureus in clinical and raw meat samples shows a probable risk for public health. Therefore, intensive and continuous monitoring of potentially pathogenic S. aureus is strongly recommended in order to evaluate the human health risk arising from food consumption.
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Affiliation(s)
- Fakhri Haghi
- Department of Microbiology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
- Student Research Committee, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Habib Zeighami
- Department of Microbiology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Zeynab Hajiloo
- Department of Microbiology, Zanjan Branch, Islamic Azad University, Zanjan, Iran
| | - Neda Torabi
- Department of Microbiology, Zanjan Branch, Islamic Azad University, Zanjan, Iran
| | - Safoura Derakhshan
- Department of Microbiology, Faculty of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran
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Féraudet Tarisse C, Goulard-Huet C, Nia Y, Devilliers K, Marcé D, Dambrune C, Lefebvre D, Hennekinne JA, Simon S. Highly Sensitive and Specific Detection of Staphylococcal Enterotoxins SEA, SEG, SEH, and SEI by Immunoassay. Toxins (Basel) 2021; 13:130. [PMID: 33572449 PMCID: PMC7916246 DOI: 10.3390/toxins13020130] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/04/2021] [Accepted: 02/05/2021] [Indexed: 01/05/2023] Open
Abstract
Staphylococcal food poisoning (SFP) is one of the most common foodborne diseases worldwide, resulting from the ingestion of staphylococcal enterotoxins (SEs), primarily SE type A (SEA), which is produced in food by enterotoxigenic strains of staphylococci, mainly S. aureus. Since newly identified SEs have been shown to have emetic properties and the genes encoding them have been found in food involved in poisoning outbreaks, it is necessary to have reliable tools to prove the presence of the toxins themselves, to clarify the role played by these non-classical SEs, and to precisely document SFP outbreaks. We have produced and characterized monoclonal antibodies directed specifically against SE type G, H or I (SEG, SEH or SEI respectively) or SEA. With these antibodies, we have developed, for each of these four targets, highly sensitive, specific, and reliable 3-h sandwich enzyme immunoassays that we evaluated for their suitability for SE detection in different matrices (bacterial cultures of S. aureus, contaminated food, human samples) for different purposes (strain characterization, food safety, biological threat detection, diagnosis). We also initiated and described for the first time the development of monoplex and quintuplex (SEA, SE type B (SEB), SEG, SEH, and SEI) lateral flow immunoassays for these new staphylococcal enterotoxins. The detection limits in buffer were under 10 pg/mL (0.4 pM) by enzyme immunoassays and at least 300 pg/mL (11 pM) by immunochromatography for all target toxins with no cross-reactivity observed. Spiking studies and/or bacterial supernatant analysis demonstrated the applicability of the developed methods, which could become reliable detection tools for the routine investigation of SEG, SEH, and SEI.
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Affiliation(s)
- Cécile Féraudet Tarisse
- Paris-Saclay University, CEA, INRAE, Medicines and Healthcare Technologies Department (DMTS), SPI, 91191 Gif-sur-Yvette, France; (C.G.-H.); (K.D.); (D.M.); (C.D.); (D.L.); (S.S.)
| | - Céline Goulard-Huet
- Paris-Saclay University, CEA, INRAE, Medicines and Healthcare Technologies Department (DMTS), SPI, 91191 Gif-sur-Yvette, France; (C.G.-H.); (K.D.); (D.M.); (C.D.); (D.L.); (S.S.)
| | - Yacine Nia
- Laboratory for Food Safety, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Université Paris-Est, 94706 Maisons-Alfort, France; (Y.N.); (J.-A.H.)
| | - Karine Devilliers
- Paris-Saclay University, CEA, INRAE, Medicines and Healthcare Technologies Department (DMTS), SPI, 91191 Gif-sur-Yvette, France; (C.G.-H.); (K.D.); (D.M.); (C.D.); (D.L.); (S.S.)
| | - Dominique Marcé
- Paris-Saclay University, CEA, INRAE, Medicines and Healthcare Technologies Department (DMTS), SPI, 91191 Gif-sur-Yvette, France; (C.G.-H.); (K.D.); (D.M.); (C.D.); (D.L.); (S.S.)
| | - Chloé Dambrune
- Paris-Saclay University, CEA, INRAE, Medicines and Healthcare Technologies Department (DMTS), SPI, 91191 Gif-sur-Yvette, France; (C.G.-H.); (K.D.); (D.M.); (C.D.); (D.L.); (S.S.)
| | - Donatien Lefebvre
- Paris-Saclay University, CEA, INRAE, Medicines and Healthcare Technologies Department (DMTS), SPI, 91191 Gif-sur-Yvette, France; (C.G.-H.); (K.D.); (D.M.); (C.D.); (D.L.); (S.S.)
- Laboratory for Food Safety, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Université Paris-Est, 94706 Maisons-Alfort, France; (Y.N.); (J.-A.H.)
| | - Jacques-Antoine Hennekinne
- Laboratory for Food Safety, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Université Paris-Est, 94706 Maisons-Alfort, France; (Y.N.); (J.-A.H.)
| | - Stéphanie Simon
- Paris-Saclay University, CEA, INRAE, Medicines and Healthcare Technologies Department (DMTS), SPI, 91191 Gif-sur-Yvette, France; (C.G.-H.); (K.D.); (D.M.); (C.D.); (D.L.); (S.S.)
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Biofilm Production Ability, Virulence and Antimicrobial Resistance Genes in Staphylococcus aureus from Various Veterinary Hospitals. Pathogens 2020; 9:pathogens9040264. [PMID: 32260416 PMCID: PMC7238219 DOI: 10.3390/pathogens9040264] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 03/21/2020] [Accepted: 03/25/2020] [Indexed: 12/13/2022] Open
Abstract
: Staphylococcus aureus (S. aureus) is one of the most clinically important zoonotic pathogens, but an understanding of the prevalence, biofilm formulation ability, virulence, and antimicrobial resistance genes of S. aureus from veterinary hospitals is lacking. By characterizing S. aureus in different origins of veterinary hospitals in Guangzhou, China, in 2019, we identified with the presence of S. aureus in pets (17.1%), veterinarians (31.7%), airborne dust (19.1%), environmental surfaces (4.3%), and medical device surfaces (10.8%). Multilocus sequence typing (MLST) and Staphylococcus protein A (spa) typing analyses demonstrated methicillin-sensitive S. aureus (MSSA) ST398-t571, MSSA ST188-t189, and methicillin-resistant S. aureus (MRSA) ST59-t437 were the most prevalent lineage. S. aureus with similar pulsed-field gel electrophoresis (PFGE) types distributed widely in different kinds of samples. The crystal violet straining assays revealed 100% (3/3) of MRSA ST59 and 81.8% (9/11) of MSSA ST188 showed strong biofilm formulation ability, whereas other STs (ST1, ST5, ST7, ST15, ST88, ST398, ST3154 and ST5353) showed weak biofilm production ability. Polymerase chain reaction (PCR) confirmed the most prevalent leucocidin, staphylococcal enterotoxins, ica operon, and adhesion genes were lukD-lukE (49.0%), sec-sel (15.7%), icaA-icaB-icaC-icaR (100.0%), and fnbB-cidA-fib-ebps-eno (100.0%), respectively. Our study showed that the isolates with strong biofilm production ability had a higher prevalence in clfA, clfB, fnbA and sdrC genes compared to the isolates with weak biofilm production ability. Furthermore, 2 ST1-MRSA isolates with tst gene and 1 ST88-MSSA isolate with lukS/F-PV gene were detected. In conclusion, the clonal dissemination of S. aureus of different origins in veterinary hospitals may have occurred; the biofilm production capacity of S. aureus is strongly correlated with ST types; some adhesion genes such as clfA, clfB, fnbA, and sdrC may pose an influence on biofilm production ability and the emergence of lukS/F-PV and tst genes in S. aureus from veterinary hospitals should raise our vigilance.
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Chieffi D, Fanelli F, Cho GS, Schubert J, Blaiotta G, Franz CMAP, Bania J, Fusco V. Novel insights into the enterotoxigenic potential and genomic background of Staphylococcus aureus isolated from raw milk. Food Microbiol 2020; 90:103482. [PMID: 32336356 DOI: 10.1016/j.fm.2020.103482] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 02/27/2020] [Accepted: 02/29/2020] [Indexed: 11/17/2022]
Abstract
In this study, 53 Staphylococcus (S.) aureus strains were typed by 16S-23S rDNA intergenic spacer region (ISR) typing and staphylococcal enterotoxin gene (SEg) typing for all the staphylococcal enterotoxin (se) and staphylococcal enterotoxin-like toxin (sel) genes known to date, revealing a higher discriminatory power than that of multi locus sequence typing. Six strains, one of each ISR- and SEg-type, were genome sequenced and the ability to produce some classical and new SEs when growing in milk was investigated. The manual analysis of the six genomes allowed us to confirm, correct and expand the results of common available genomic data pipelines such as VirulenceFinder. Moreover, it enabled us to (i) investigate the actual location of se and sel genes, even for genes such as selY, whose location (in the core genome) was so far unknown, (ii) find novel allelic variants of se and sel genes and pseudogenes, (iii) correctly annotate se and sel genes and pseudogenes, and (iv) discover a novel type of enterotoxin gene cluster (egc), i.e. the egc type 5 in strains 356P and 364P, while S. argenteus MSHR1132 harbored the egc type 6. Four of the six S. aureus strains produced sufficient amounts of SEA, SEC, SED and SEH in milk to cause staphylococcal food poisoning (SFP), with S. aureus 372 P being the highest producer of SED in milk found to date, producing as much as ca. 47,300 ng/mL and 49,200 ng/mL of SED, after 24 and 48 h of incubation in milk at 37 °C, respectively. S. aureus 372 P released a low amount of SER in milk, most likely because the seR gene was present as a pseudogene, putatively encoding only 51 amino acids. These findings confirm that not only the classical SEs, but also the new ones can represent a potential hazard for the consumers' health if produced in foods in sufficient amounts. Therefore, the detection of SEs in foods, especially if involved in SFP cases, should focus not only on classical, but also on all the new SEs and SEls known to date. Where reference methods are unavailable, the presence of the relevant genes, by using the conventional and real time PCR protocols we exhaustively provided herein, and their nucleotide sequences, should be investigated.
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Affiliation(s)
- Daniele Chieffi
- National Research Council of Italy, Institute of Sciences of Food Production (CNR-ISPA), Bari, Italy
| | - Francesca Fanelli
- National Research Council of Italy, Institute of Sciences of Food Production (CNR-ISPA), Bari, Italy
| | - Gyu-Sung Cho
- Max Rubner-Institut, Department of Microbiology and Biotechnology, Hermann-Weigmann-Straße 1, 24103, Kiel, Germany
| | - Justyna Schubert
- Department of Food Hygiene and Consumer Health Protection, Wrocław University of Environmental and Life Sciences, Wrocław, Poland
| | - Giuseppe Blaiotta
- Department of Agricultural Sciences, Division of Vine and Wine Sciences, University of Naples Federico II, Viale Italia, 83100, Avellino, Italy
| | - Charles M A P Franz
- Max Rubner-Institut, Department of Microbiology and Biotechnology, Hermann-Weigmann-Straße 1, 24103, Kiel, Germany
| | - Jacek Bania
- Department of Food Hygiene and Consumer Health Protection, Wrocław University of Environmental and Life Sciences, Wrocław, Poland
| | - Vincenzina Fusco
- National Research Council of Italy, Institute of Sciences of Food Production (CNR-ISPA), Bari, Italy.
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Chen Q, Xie S. Genotypes, Enterotoxin Gene Profiles, and Antimicrobial Resistance of Staphylococcus aureus Associated with Foodborne Outbreaks in Hangzhou, China. Toxins (Basel) 2019; 11:toxins11060307. [PMID: 31146460 PMCID: PMC6628443 DOI: 10.3390/toxins11060307] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 05/19/2019] [Accepted: 05/23/2019] [Indexed: 12/19/2022] Open
Abstract
Staphylococcal food poisoning is an illness caused by the consumption of food that contains sufficient amounts of one or more enterotoxins. In the present study, a total of 37 S. aureus isolates were recovered from leftover food, swabs from a kitchen environment, and patient feces associated with four foodborne outbreaks that occurred in Hangzhou, southeast China, and were characterized by multilocus sequence typing (MLST), spa typing, pulse-field gel electrophoresis (PFGE), and antimicrobial susceptibility. Classical enterotoxin and enterotoxin-like genes were profiled by PCR analysis. ST6-t304 was the most common clone (40.54%), followed by ST2315-t11687 (32.43%). Six clusters (A to F) were divided based on PFGE patterns, and Clusters A and C were the most common types, constituting 86.49% of all isolates. Moreover, sea was the most frequently identified enterotoxin gene (81.08%), followed by the combination of seg-sei-selm-seln-sleo-selu and sec-sell (each 48.65%). Five isolates also harbored the exotoxin cluster sed-selj-ser. In addition, resistance to penicillin (97.30%), erythromycin (37.85), tetracycline (32.43%), clindamycin, gentamicin, and sulfamethoxazole (each 10.81%) was observed. Our research demonstrated the link between leftover foods and patients by molecular typing and detecting the profiles of enterotoxin or enterotoxin-like genes in human and food isolates. S. aureus maintains an extensive repertoire of enterotoxins and drug resistance genes that could cause potential health threats to consumers.
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Affiliation(s)
- Qi Chen
- Department of Microbiology, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, China.
| | - Sangma Xie
- College of Life Information Science and Instrument Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.
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Fisher EL, Otto M, Cheung GYC. Basis of Virulence in Enterotoxin-Mediated Staphylococcal Food Poisoning. Front Microbiol 2018; 9:436. [PMID: 29662470 PMCID: PMC5890119 DOI: 10.3389/fmicb.2018.00436] [Citation(s) in RCA: 145] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 02/26/2018] [Indexed: 12/17/2022] Open
Abstract
The Staphylococcus aureus enterotoxins are a superfamily of secreted virulence factors that share structural and functional similarities and possess potent superantigenic activity causing disruptions in adaptive immunity. The enterotoxins can be separated into two groups; the classical (SEA-SEE) and the newer (SEG-SElY and counting) enterotoxin groups. Many members from both these groups contribute to the pathogenesis of several serious human diseases, including toxic shock syndrome, pneumonia, and sepsis-related infections. Additionally, many members demonstrate emetic activity and are frequently responsible for food poisoning outbreaks. Due to their robust tolerance to denaturing, the enterotoxins retain activity in food contaminated previously with S. aureus. The genes encoding the enterotoxins are found mostly on a variety of different mobile genetic elements. Therefore, the presence of enterotoxins can vary widely among different S. aureus isolates. Additionally, the enterotoxins are regulated by multiple, and often overlapping, regulatory pathways, which are influenced by environmental factors. In this review, we also will focus on the newer enterotoxins (SEG-SElY), which matter for the role of S. aureus as an enteropathogen, and summarize our current knowledge on their prevalence in recent food poisoning outbreaks. Finally, we will review the current literature regarding the key elements that govern the complex regulation of enterotoxins, the molecular mechanisms underlying their enterotoxigenic, superantigenic, and immunomodulatory functions, and discuss how these activities may collectively contribute to the overall manifestation of staphylococcal food poisoning.
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Affiliation(s)
- Emilie L Fisher
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Michael Otto
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Gordon Y C Cheung
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
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12
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Rumjuankiat K, Keawsompong S, Nitisinprasert S. Bacterial contaminants from frozen puff pastry production process and their growth inhibition by antimicrobial substances from lactic acid bacteria. Food Sci Nutr 2017; 5:454-465. [PMID: 28572930 PMCID: PMC5448371 DOI: 10.1002/fsn3.413] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 06/18/2016] [Accepted: 06/29/2016] [Indexed: 12/15/2022] Open
Abstract
Seventy-five bacterial contaminants which still persisted to cleaning system from three puff pastry production lines (dough forming, layer and filling forming, and shock freezing) were identified using 16S rDNA as seven genera of Bacillus, Corynebacterium, Dermacoccus, Enterobacter, Klebsiella, Pseudomonas, and Staphylococcus with detection frequencies of 24.00, 2.66, 1.33, 37.33, 1.33, 2.66, and 30.66, respectively. Seventeen species were discovered while only 11 species Bacillus cereus, B. subtilis, B. pumilus, Corynebacterium striatum, Dermacoccus barathri, Enterobacter asburiae, Staphylococcus kloosii, S. haemolyticus, S. hominis, S. warneri, and S. aureus were detected at the end of production. Based on their abundance, the highest abundance of E. asburiae could be used as a biomarker for product quality. While a low abundance of the mesophile pathogen C. striatum, which causes respiratory and nervous infection and appeared only at the shock freezing step was firstly reported for its detection in bakery product. Six antimicrobial substances (AMSs) from lactic acid bacteria, FF1-4, FF1-7, PFUR-242, PFUR-255, PP-174, and nisin A were tested for their inhibition activities against the contaminants. The three most effective were FF1-7, PP-174, and nisin A exhibiting wide inhibition spectra of 88.00%, 85.33%, and 86.66%, respectively. The potential of a disinfectant solution containing 800 AU/ml of PP-174 and nisin A against the most resistant strains of Enterobacter, Staphylococcus, Bacillus and Klebsiella was determined on artificially contaminated conveyor belt coupons at 0, 4, 8, 12, and 16 hr. The survival levels of the test strains were below 1 log CFU/coupon at 0 hr. The results suggested that a combined solution of PP-174 and nisin A may be beneficial as a sanitizer to inhibit bacterial contaminants in the frozen puff pastry industry.
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Affiliation(s)
- Kittaporn Rumjuankiat
- Specialized Research Unit: Prebiotics and Probiotics for HealthFaculty of Agro‐IndustryDepartment of BiotechnologyKasetsart UniversityBangkokThailand
| | - Suttipun Keawsompong
- Specialized Research Unit: Prebiotics and Probiotics for HealthFaculty of Agro‐IndustryDepartment of BiotechnologyKasetsart UniversityBangkokThailand
- Center for Advanced Studies for Agriculture and FoodKasetsart University Institute for Advanced StudiesKasetsart UniversityBangkokThailand
| | - Sunee Nitisinprasert
- Specialized Research Unit: Prebiotics and Probiotics for HealthFaculty of Agro‐IndustryDepartment of BiotechnologyKasetsart UniversityBangkokThailand
- Center for Advanced Studies for Agriculture and FoodKasetsart University Institute for Advanced StudiesKasetsart UniversityBangkokThailand
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13
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Acosta AC, Silva LBGD, Medeiros ES, Pinheiro-Júnior JW, Mota RA. Mastites em ruminantes no Brasil. PESQUISA VETERINARIA BRASILEIRA 2016. [DOI: 10.1590/s0100-736x2016000700001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Resumo: A mastite é uma doença complexa e considerada uma das principais causas de perdas à indústria leiteira mundial. Objetivou-se com esta revisão compilar informações dos últimos dez anos sobre a mastite em ruminantes no Brasil. A prevalência da mastite subclínica chega a 48,64% na espécie bovina, 30,7% na espécie caprina, 31,45% na espécie ovina e 42,2% na espécie bubalina, destacando-se a etiologia por Staphylococcus spp. Os fatores de risco associados à ocorrência de mastite estão relacionados a problemas no saneamento ambiental e ao manejo dos animais. As bactérias isoladas do leite mastítico apresentam maior percentual de resistência a penicilina, ampicilina, amoxicilina e neomicina e a utilização de técnicas moleculares no diagnóstico dos agentes causadores de mastites no país, ainda é escassa o que dificulta a obtenção de um diagnóstico mais rápido, sensível e específico.
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Wang W, Wang W, Liu L, Xu L, Kuang H, Zhu J, Xu C. Nanoshell-Enhanced Raman Spectroscopy on a Microplate for Staphylococcal Enterotoxin B Sensing. ACS APPLIED MATERIALS & INTERFACES 2016; 8:15591-15597. [PMID: 27193082 DOI: 10.1021/acsami.6b02905] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A sensitive surface-enhanced Raman scattering (SERS) immunosensor based on the Au nanoparticle (Au NP) shell structure was developed to detect staphylococcal enterotoxin B (SEB) on a microplate. Au NPs modified with 4-nitrothiophenol (4-NTP) and coated with Ag shell of controlled thickness at 6.6 nm exhibited excellent SERS intensity and were used as signal reporters in the detection of SEB. The engaged 4-NTP allowed the significant electromagnetic enhancement between Au NPs and the Ag shell and prevented the dissociation of the Raman reporter. More importantly, 4-NTP-differentiated SERS signals between the sample and microplate. The SERS-based immunosensor had a limit of detection of 1.3 pg/mL SEB. Analysis of SEB-spiked milk samples revealed that the developed method had high accuracy. Therefore, the SERS-encoded Au@Ag core-shell structure-based immunosensor is promising for the detection of biotoxins, pathogens, and environmental pollutants.
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Affiliation(s)
| | - Weiwei Wang
- Cereals & Oils Nutrition Research Group, Academy of Science & Technology of State Administration of Grain , Beijing 100037, People's Republic of China
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Song Q, Zhu Z, Chang Y, Shen X, Gao H, Yang Y. Prevalence and Characteristics of Enterotoxin B‐Producing Staphylococcus aureusIsolated from Food Sources: A Particular Cluster of ST188 Strains was Identified. J Food Sci 2016; 81:M715-8. [DOI: 10.1111/1750-3841.13223] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 12/18/2015] [Indexed: 12/18/2022]
Affiliation(s)
- Qifa Song
- Dept. of MicrobiologyNingbo Municipal Centre for Disease Control and Prevention Ningbo Zhejiang Province People's Republic of China
| | - Zhenhua Zhu
- Dept. of MicrobiologyXiangshan Entry‐Exit Inspection and Quarantine Bureau People's Republic of China
| | - Yanzi Chang
- Dept. of MicrobiologyNingbo Medical Treatment Center Lihuili Hospital Ningbo Zhejiang Province People's Republic of China
| | - Xuanyi Shen
- Dept. of MicrobiologyNingbo Municipal Centre for Disease Control and Prevention Ningbo Zhejiang Province People's Republic of China
| | - Hong Gao
- Dept. of MicrobiologyNingbo Municipal Centre for Disease Control and Prevention Ningbo Zhejiang Province People's Republic of China
| | - Yuanbin Yang
- Dept. of MicrobiologyNingbo Municipal Centre for Disease Control and Prevention Ningbo Zhejiang Province People's Republic of China
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Sharma P, Wang N, Chervin AS, Quinn CL, Stone JD, Kranz DM. A Multiplex Assay for Detection of Staphylococcal and Streptococcal Exotoxins. PLoS One 2015; 10:e0135986. [PMID: 26305471 PMCID: PMC4549143 DOI: 10.1371/journal.pone.0135986] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 07/28/2015] [Indexed: 11/18/2022] Open
Abstract
Staphylococcal and streptococcal exotoxins, also known as superantigens, mediate a range of diseases including toxic shock syndrome, and they exacerbate skin, pulmonary and systemic infections caused by these organisms. When present in food sources they can cause enteric effects commonly known as food poisoning. A rapid, sensitive assay for the toxins would enable testing of clinical samples and improve surveillance of food sources. Here we developed a bead-based, two-color flow cytometry assay using single protein domains of the beta chain of T cell receptors engineered for high-affinity for staphylococcal (SEA, SEB and TSST-1) and streptococcal (SpeA and SpeC) toxins. Site-directed biotinylated forms of these high-affinity agents were used together with commercial, polyclonal, anti-toxin reagents to enable specific and sensitive detection with SD50 values of 400 pg/ml (SEA), 3 pg/ml (SEB), 25 pg/ml (TSST-1), 6 ng/ml (SpeA), and 100 pg/ml (SpeC). These sensitivities were in the range of 4- to 80-fold higher than achieved with standard ELISAs using the same reagents. A multiplex format of the assay showed reduced sensitivity due to higher noise associated with the use of multiple polyclonal agents, but the sensitivities were still well within the range necessary for detection in food sources or for rapid detection of toxins in culture supernatants. For example, the assay specifically detected toxins in supernatants derived from cultures of Staphylococcus aureus. Thus, these reagents can be used for simultaneous detection of the toxins in food sources or culture supernatants of potential pathogenic strains of Staphylococcus aureus and Streptococcus pyogenes.
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Affiliation(s)
- Preeti Sharma
- Department of Biochemistry, University of Illinois, Urbana, Illinois, United States of America
| | - Ningyan Wang
- ImmuVen, Inc., University of Illinois Research Park, Champaign, Illinois, United States of America
| | - Adam S. Chervin
- ImmuVen, Inc., University of Illinois Research Park, Champaign, Illinois, United States of America
| | - Cheryl L. Quinn
- ImmuVen, Inc., University of Illinois Research Park, Champaign, Illinois, United States of America
| | - Jennifer D. Stone
- Department of Biochemistry, University of Illinois, Urbana, Illinois, United States of America
| | - David M. Kranz
- Department of Biochemistry, University of Illinois, Urbana, Illinois, United States of America
- * E-mail:
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