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Ojha S, Thakur KK, Ojasanya RA, Saab ME. Retrospective study on the occurrence of Salmonella serotypes in veterinary specimens of Atlantic Canada (2012-2021). Vet Med Sci 2024; 10:e1530. [PMID: 38979670 PMCID: PMC11231644 DOI: 10.1002/vms3.1530] [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: 09/25/2023] [Revised: 03/14/2024] [Accepted: 06/14/2024] [Indexed: 07/10/2024] Open
Abstract
AIM This study aimed to summarize the frequency and the antimicrobial susceptibility profiles of the Salmonella serotypes identified from the specimens of companion animals, livestock, avian, wildlife and exotic species within Atlantic Canada. MATERIALS AND METHODS The retrospective electronic laboratory data of microbiological analyses of a selected subset of samples from 03 January 2012 to 29 December 2021 submitted from various animal species were retrieved. The frequency of Salmonella serotypes identified, and their antimicrobial susceptibility results obtained using the disk diffusion or broth method were analysed. The test results were interpreted according to the Clinical and Laboratory Standards Institute standard. The Salmonella serotypes were identified by slide agglutination (Kauffman-White-Le-Minor Scheme) and/or the Whole Genome Sequencing for the Salmonella in silico Serovar Typing Resource-based identification. RESULTS Of the cases included in this study, 4.6% (n = 154) had at least one Salmonella isolate, corresponding to 55 different serovars. Salmonella isolation was highest from exotic animal species (n = 40, 1.20%), followed by porcine (n = 26, 0.78%), and canine (n = 23, 0.69%). Salmonella subsp. enterica serovar Typhimurium was predominant among exotic mammals, porcine and caprine samples, whereas S. Enteritidis was mostly identified in bovine and canine samples. S. Typhimurium of porcine origin was frequently resistant (>70.0%) to ampicillin. In contrast, S. Typhimurium isolates from porcine and caprine samples were susceptible (>70.0%) to florfenicol. S. Oranienburg from equine samples was susceptible to chloramphenicol, but frequently resistant (>90.0%) to azithromycin. In avian samples, S. Copenhagen was susceptible (>90.0%) to florfenicol, whereas Muenchen was frequently resistant (>90.0%) to florfenicol. S. subsp. diarizonae serovar IIIb:61:k:1,5 of ovine origin was resistant (50.0% isolates) to sulfadimethoxine. No significant changes were observed in the antibiotic resistance profiles across the study years. CONCLUSIONS This report provides data for surveillance studies, distribution of Salmonella serotypes and their antimicrobial resistance among veterinary specimens of Atlantic Canada.
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Affiliation(s)
- Shivani Ojha
- Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
- Veterinary Diagnostic Services Laboratory, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Krishna K Thakur
- Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Rasaq A Ojasanya
- Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Matthew E Saab
- Veterinary Diagnostic Services Laboratory, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
- Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
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Aarø NS, Torpdahl M, Rasmussen T, Jensen M, Nielsen HL. Salmonella infections in Denmark from 2013-2022 with focus on serotype distribution, invasiveness, age, sex, and travel exposition. Eur J Clin Microbiol Infect Dis 2024; 43:947-957. [PMID: 38512514 PMCID: PMC11108954 DOI: 10.1007/s10096-024-04808-9] [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: 12/02/2023] [Accepted: 03/11/2024] [Indexed: 03/23/2024]
Abstract
PURPOSE To analyze the nationwide incidence of Salmonella infections in Denmark from 2013 to 2022. METHODS Confirmed cases of Salmonella enterica subsp. enterica were examined using the National Register of Enteric Pathogens during 2013-2022. Proportions, incidence rates (IR), relative risk (RR), and 95% confidence intervals (CI) were calculated to assess differences in serotypes, invasiveness, age, sex, and travel exposure. RESULTS We identified 9,944 Danish Salmonella enterica subsp. enterica cases, with an average annual incidence rate of 16.9 per 100,000 inhabitants, declining during the COVID-19 pandemic. Typhoidal cases totaled 206, with an average annual IR of 0.35 per 100,000 inhabitants. Enteric fever patients had a median age of 24 years (IQR:17-36). Leading non-typhoid Salmonella (NTS) serotypes were S. Enteritidis (26.4%), monophasic S. Typhimurium (16.5%), and S. Typhimurium (13.5%). Median age for NTS cases was 42 (IQR: 18-62), with even sex distribution, and a third reported travel prior to onset of disease. The overall percentage of invasive NTS (iNTS) infection was 8.1% (CI: 7.6-8.7). Eleven serotypes were associated with higher invasiveness, with S. Dublin and S. Panama having the highest invasiveness with age and sex-adjusted RR of 7.31 (CI: 6.35-8.43) and 5.42 (CI: 3.42-8.60), respectively, compared to all other NTS serotypes. Increased age was associated with higher RR for iNTS infection. CONCLUSION During the decade, there was a limited number of typhoidal cases. The dominant NTS serotypes were S. Enteritidis and monophasic S. Typhimurium, whereas S. Dublin and S. Panama exhibited the highest invasive potential.
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Affiliation(s)
| | - Mia Torpdahl
- Department for Bacteria, Parasites & Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Torben Rasmussen
- Department of Data Integration and Analysis, Statens Serum Institut, Copenhagen, Denmark
| | - Martin Jensen
- Research Data and Biostatistics, Aalborg University Hospital, Aalborg, Denmark
| | - Hans Linde Nielsen
- Department of Clinical Microbiology, Aalborg University Hospital, Aalborg, Denmark.
- Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.
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Pandeya A, Zhang Y, Cui J, Yang L, Li J, Zhang G, Wu C, Li Z, Wei Y. Inflammasome activation and pyroptosis mediate coagulopathy and inflammation in Salmonella systemic infection. Microbiol Res 2023; 275:127460. [PMID: 37467711 PMCID: PMC10693354 DOI: 10.1016/j.micres.2023.127460] [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: 05/27/2023] [Revised: 07/09/2023] [Accepted: 07/12/2023] [Indexed: 07/21/2023]
Abstract
Inflammasome activation is a critical defense mechanism against bacterial infection. Previous studies suggest that inflammasome activation protects against Salmonella oral infection. Here we find inflammasome activation plays a critical role in the pathogenesis of Salmonella systemic infection. We show that in a systemic infection model by i.p. injection of Salmonella, deficiency of caspase-1 or gasdermin-D prolonged survival time, reduced plasma concentrations of the proinflammatory cytokines IL-1β, IL-6 and TNFα. These deficiencies also protected against coagulopathy during Salmonella infection as evidenced by diminished prolongation of prothrombin time and increase in plasma thrombin-antithrombin complex concentrations in the caspase-1 or gasdermin-D deficient mice. Activation of the NAIP/NLRC4 inflammasome by flagellin and/or the components of the SPI1 type 3 secretion system played a critical role in Salmonella-induced coagulopathy. In the absence of flagellin and SPI1, the Salmonella mutant strain still triggered coagulopathy through the caspase-11/NLRP3 pathway. Our results reveal a previously undisclosed role of the inflammasomes and pyroptosis in the pathogenesis of Salmonella systemic infection.
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Affiliation(s)
- Ankit Pandeya
- Department of Pharmaceutical Sciences, Irma Lerma Rangel School of Pharmacy, Texas A&M University, College Station, TX, USA; Department of Chemistry, University of Kentucky, Lexington, KY, USA
| | - Yan Zhang
- Department of Pharmaceutical Sciences, Irma Lerma Rangel School of Pharmacy, Texas A&M University, College Station, TX, USA
| | - Jian Cui
- Saha Cardiovascular Research Center, College of Medicine, University of Kentucky, Lexington, KY, USA
| | - Ling Yang
- Department of Pharmaceutical Sciences, Irma Lerma Rangel School of Pharmacy, Texas A&M University, College Station, TX, USA
| | - Jeffery Li
- Department of Pharmaceutical Sciences, Irma Lerma Rangel School of Pharmacy, Texas A&M University, College Station, TX, USA
| | - Guoying Zhang
- Department of Pharmaceutical Sciences, Irma Lerma Rangel School of Pharmacy, Texas A&M University, College Station, TX, USA
| | - Congqing Wu
- Saha Cardiovascular Research Center, College of Medicine, University of Kentucky, Lexington, KY, USA; Department of Surgery, College of Medicine, University of Kentucky, Lexington, KY, USA; Department of Microbiology, Immunology, and Molecular Genetics, College of Medicine, University of Kentucky, Lexington, KY, USA
| | - Zhenyu Li
- Department of Pharmaceutical Sciences, Irma Lerma Rangel School of Pharmacy, Texas A&M University, College Station, TX, USA.
| | - Yinan Wei
- Department of Pharmaceutical Sciences, Irma Lerma Rangel School of Pharmacy, Texas A&M University, College Station, TX, USA.
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Uhland FC, Li XZ, Mulvey MR, Reid-Smith R, Sherk LM, Ziraldo H, Jin G, Young KM, Reist M, Carson CA. Extended Spectrum β-Lactamase-Producing Enterobacterales of Shrimp and Salmon Available for Purchase by Consumers in Canada-A Risk Profile Using the Codex Framework. Antibiotics (Basel) 2023; 12:1412. [PMID: 37760708 PMCID: PMC10525137 DOI: 10.3390/antibiotics12091412] [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: 08/02/2023] [Revised: 08/24/2023] [Accepted: 09/02/2023] [Indexed: 09/29/2023] Open
Abstract
The extended-spectrum β-lactamase (ESBL)-producing Enterobacterales (ESBL-EB) encompass several important human pathogens and are found on the World Health Organization (WHO) priority pathogens list of antibiotic-resistant bacteria. They are a group of organisms which demonstrate resistance to third-generation cephalosporins (3GC) and their presence has been documented worldwide, including in aquaculture and the aquatic environment. This risk profile was developed following the Codex Guidelines for Risk Analysis of Foodborne Antimicrobial Resistance with the objectives of describing the current state of knowledge of ESBL-EB in relation to retail shrimp and salmon available to consumers in Canada, the primary aquacultured species consumed in Canada. The risk profile found that Enterobacterales and ESBL-EB have been found in multiple aquatic environments, as well as multiple host species and production levels. Although the information available did not permit the conclusion as to whether there is a human health risk related to ESBLs in Enterobacterales in salmon and shrimp available for consumption by Canadians, ESBL-EB in imported seafood available at the retail level in Canada have been found. Surveillance activities to detect ESBL-EB in seafood are needed; salmon and shrimp could be used in initial surveillance activities, representing domestic and imported products.
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Affiliation(s)
- F. Carl Uhland
- Centre for Foodborne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, ON N1H 7M7, Canada
| | - Xian-Zhi Li
- Veterinary Drugs Directorate, Health Products and Food Branch, Health Canada, Ottawa, ON K1A 0K9, Canada
| | - Michael R. Mulvey
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB R3E 3R2, Canada
| | - Richard Reid-Smith
- Centre for Foodborne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, ON N1H 7M7, Canada
| | - Lauren M. Sherk
- Centre for Foodborne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, ON N1H 7M7, Canada
| | - Hilary Ziraldo
- Centre for Foodborne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, ON N1H 7M7, Canada
| | - Grace Jin
- Centre for Foodborne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, ON N1H 7M7, Canada
| | - Kaitlin M. Young
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB R3E 3R2, Canada
| | - Mark Reist
- Veterinary Drugs Directorate, Health Products and Food Branch, Health Canada, Ottawa, ON K1A 0K9, Canada
| | - Carolee A. Carson
- Centre for Foodborne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, ON N1H 7M7, Canada
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Saidenberg ABS, Franco LS, Reple JN, Hounmanou YMG, Casas MRT, Cardoso B, Esposito F, Lincopan N, Dalsgaard A, Stegger M, Knöbl T. Salmonella Heidelberg and Salmonella Minnesota in Brazilian broilers: Genomic characterization of third-generation cephalosporin and fluoroquinolone-resistant strains. ENVIRONMENTAL MICROBIOLOGY REPORTS 2023; 15:119-128. [PMID: 36629129 PMCID: PMC10103857 DOI: 10.1111/1758-2229.13132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 10/12/2022] [Indexed: 05/20/2023]
Abstract
Salmonella serovars Heidelberg and Minnesota encoding antimicrobial resistance to third-generation cephalosporins and fluoroquinolones are often detected in poultry/poultry meat. We analysed the genomes of 10 Salmonella Heidelberg (SH) and 4 Salmonella Minnesota (SM) from faecal isolates of Brazilian poultry. These featured virulent and multidrug-resistant characteristics, with AmpC beta-lactamase (blaCMY-2 ) predominance (9/14), for all SM (4/4) and some SH (3/10) located on IncC plasmid replicons. IncC carrying blaCTX-M-2 was only detected among SH (3/10). Mutation in the gyrA/parC genes was present in all SH, whereas SM harboured parC mutation plus qnrB19 on ColRNAI plasmids (3/4). In silico resistance overall corroborated with phenotypic results. Core genome phylogenies showed close clustering and high similarities between the Brazilian and poultry meat/food isolates from Europe, and to human isolates from European countries with documented import of Brazilian poultry meat. Conjugation assays with SM successfully transferred blaCMY-2 , and qnrB19 to an Escherichia coli recipient. The findings reinforce the ongoing antimicrobial resistance acquisition of SH and Minnesota and the risks for disseminating resistant strains and/or mobile elements which may increasingly affect importing countries and the need for controlling AMR in major poultry-exporting countries like Brazil.
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Affiliation(s)
- Andre Becker Simoes Saidenberg
- Department of Veterinary PathologySchool of Veterinary Medicine and Animal ScienceSão PauloBrazil
- Department of Veterinary and Animal Sciences, Section for Food Safety and ZoonosesInstitute for Veterinary and Companion Animal Science, Københavns UniversitetCopenhagenDenmark
- Department of Bacteria, Parasites and FungiStatens Serum InstitutCopenhagenDenmark
| | - Leticia Soares Franco
- Department of Veterinary PathologySchool of Veterinary Medicine and Animal ScienceSão PauloBrazil
| | - Jessica Nacarato Reple
- Department of Veterinary PathologySchool of Veterinary Medicine and Animal ScienceSão PauloBrazil
| | - Yaovi Mahuton Gildas Hounmanou
- Department of Veterinary and Animal Sciences, Section for Food Safety and ZoonosesInstitute for Veterinary and Companion Animal Science, Københavns UniversitetCopenhagenDenmark
| | | | - Brenda Cardoso
- Department of MicrobiologyInstitute of Biomedical Science, University of São PauloSão PauloBrazil
| | - Fernanda Esposito
- Department of Clinical AnalysisSchool of Pharmaceutical Sciences, University of São PauloSão PauloBrazil
| | - Nilton Lincopan
- Department of MicrobiologyInstitute of Biomedical Science, University of São PauloSão PauloBrazil
- Department of Clinical AnalysisSchool of Pharmaceutical Sciences, University of São PauloSão PauloBrazil
| | - Anders Dalsgaard
- Department of Veterinary and Animal Sciences, Section for Food Safety and ZoonosesInstitute for Veterinary and Companion Animal Science, Københavns UniversitetCopenhagenDenmark
| | - Marc Stegger
- Department of Bacteria, Parasites and FungiStatens Serum InstitutCopenhagenDenmark
| | - Terezinha Knöbl
- Department of Veterinary PathologySchool of Veterinary Medicine and Animal ScienceSão PauloBrazil
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Tokuyama Y, Yamada H, Shinozuka K, Yunoki T, Ohtsuru S. Pyogenic sacroiliitis caused by Salmonella schwarzengrund in a young healthy woman: a case report and literature review. Int J Emerg Med 2023; 16:21. [PMID: 36941606 PMCID: PMC10026423 DOI: 10.1186/s12245-023-00496-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 03/08/2023] [Indexed: 03/23/2023] Open
Abstract
BACKGROUND Salmonella species are a leading cause of diarrheal diseases worldwide. Recent epidemiological studies have shown that Salmonella schwarzengrund (S. schwarzengrund) is highly prevalent in various regions. Herein, we report that S. schwarzengrund caused sacroiliac joint (SIJ) infection with septic shock in a young woman, although she was immunocompetent. CASE PRESENTATION A 20-year-old woman presented with left hip pain, accompanied by vasopressor-requiring hypotension. Her imaging examinations showed fluid collection in her SIJ and a small abscess in the left iliac muscle. Later, the blood and aspiration fluid culture and genetic analysis revealed the presence of S. schwarzengrund. We diagnosed sacroiliac joint (SIJ) infection with septic shock caused by S. schwarzengrund. Her condition improved after performing several interventional radiology (IVR) procedures for SIJ abscesses and providing appropriate antibiotic treatment. Finally, she was discharged without any sequelae. Screening tests and genetic analysis about her immunodeficiency did not indicate a congenital disorder. CONCLUSION These clinical courses indicate that S. schwarzengrund could cause the fatal SIJ infection irrespective of the host immunocompetence. Considering the recent increase in the diagnostic rate of S. schwarzengrund, this case emphasized the need to be more cautious about Salmonella species infection.
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Affiliation(s)
- Yuki Tokuyama
- Department of Primary Care and Emergency Medicine, Kyoto University, Kyoto, Japan
| | - Hiroyuki Yamada
- Department of Primary Care and Emergency Medicine, Kyoto University, Kyoto, Japan
- Department of Nephrology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Ken Shinozuka
- Department of Primary Care and Emergency Medicine, Kyoto University, Kyoto, Japan
| | - Tomoyuki Yunoki
- Department of Primary Care and Emergency Medicine, Kyoto University, Kyoto, Japan
| | - Shigeru Ohtsuru
- Department of Primary Care and Emergency Medicine, Kyoto University, Kyoto, Japan.
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Temporal Study of Salmonella enterica Serovars Isolated from Environmental Samples from Ontario Poultry Breeder Flocks between 2009 and 2018. Pathogens 2023; 12:pathogens12020278. [PMID: 36839550 PMCID: PMC9967235 DOI: 10.3390/pathogens12020278] [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: 01/13/2023] [Revised: 02/02/2023] [Accepted: 02/02/2023] [Indexed: 02/11/2023] Open
Abstract
This study's goal was to determine the prevalence, temporal trends, seasonal patterns, and temporal clustering of Salmonella enterica isolated from environmental samples from Ontario's poultry breeding flocks between 2009 and 2018. Clusters of common serovars and those of human health concern were identified using a scan statistic. The period prevalence of S. enterica was 25.3% in broiler breeders, 6.4% in layer breeders, and 28.6% in turkey breeders. An overall decreasing trend in S. enterica prevalence was identified in broiler breeders (from 27.8% in 2009 to 22.1% in 2018) and layer breeders (from 15.4% to 4.9%), while an increasing trend was identified in turkey breeders (from 12.0% to 24.5%). The most common serovars varied by commodity. Among broiler breeders, S. enterica serovars Kentucky (42.4% of 682 submissions), Heidelberg (19.2%), and Typhimurium (5.4%) were the most common. Salmonella enterica serovars Thompson (20.0% of 195 submissions) and Infantis (16.4%) were most common among layer breeders, and S. enterica serovars Schwarzengrund (23.6% of 1368 submissions), Senftenberg (12.9%), and Heidelberg and Uganda (9.6% each) were most common among turkey breeders. Salmonella enterica ser. Enteritidis prevalence was highest in submissions from broiler breeders (3.7% of 682 broiler breeder submissions). Temporal clusters of S. enterica serovars were identified for all poultry commodities. Seasonal effects varied by commodity, with most peaks occurring in the fall. Our study provides information on the prevalence and temporality of S. enterica serovars within Ontario's poultry breeder flocks that might guide prevention and control programs at the breeder level.
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Ooka T, Gotoh Y, Hatanaka S, Yoshimori M, Nishitarumizu K, Kojo K, Kosakamoto H, Sameshima K, Kuroki Y, Chibana N, Doi Y, Yoshino S, Harada T, Seto K, Ikeda T, Miyanohara H, Nakayama K, Gokuden M, Imuta N, Kawamura H, Ogura Y, Hayashi T, Nishi J. A Salmonella enterica Serovar Oranienburg Clone Caused a Cluster of Bacteremia Cases in Persons With No Recognizable Underlying Diseases in Japan. Open Forum Infect Dis 2022; 10:ofac695. [PMID: 36686639 PMCID: PMC9846185 DOI: 10.1093/ofid/ofac695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 12/26/2022] [Indexed: 12/29/2022] Open
Abstract
Background Salmonella enterica subspecies enterica serovar Oranienburg (SO) is a foodborne pathogen but rarely causes systemic infections such as bacteremia. Between July and September 2018, bacteremia cases caused by SO were identified in 12 persons without any underlying medical conditions in the southern Kyushu area of Japan. Methods Randomly amplified polymorphic DNA (RAPD) analysis was performed to investigate the genetic similarity of the 12 bacteremia-related strains and other Japanese isolates. Furthermore, a series of whole-genome sequence (WGS)-based phylogenetic analyses was performed with a global SO strain set (n = 1648). Results The resolution power of RAPD was insufficient to investigate the genetic similarity between the bacteremia-related strains and other strains. WGS-based phylogenetic analyses revealed that the bacteremia-related strains formed a tight cluster along with 2 strains isolated from asymptomatic carriers in 2018 in the same area, with a maximum within-cluster single-nucleotide polymorphism (SNP) distance of 11. While several strains isolated in the United States and the United Kingdom were found to be closely related to the bacteremia-related strains, 2 strains isolated in 2016 in the southern Kyushu area were most closely related, with SNP distances of 4-11 and 5-10, and had the same plasmids as the bacteremia-related strains. Conclusions The 12 bacteremia cases identified were caused by a single SO clone. As none of the bacteremia patients had any underlying diseases, this clone may be prone to cause bacteremia. Although further analyses are required to understand its virulence, particular attention should be given to this clone and its close relatives in the surveillance of nontyphoidal salmonellae.
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Affiliation(s)
- Tadasuke Ooka
- Correspondence: Tadasuke Ooka, PhD, Department of Microbiology, Graduate School of Medical and Dental Sciences, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima-shi, Kagoshima 890-8544, Japan ()
| | - Yasuhiro Gotoh
- Department of Bacteriology, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Shigeki Hatanaka
- Department of Emergency and General Internal Medicine, Imamura General Hospital, Kagoshima, Japan
| | - Miyuki Yoshimori
- Department of Infection Control and Prevention, Imamura General Hospital, Kagoshima, Japan
| | - Kazutaka Nishitarumizu
- Department of Emergency and General Internal Medicine, Imamura General Hospital, Kagoshima, Japan
| | - Kanami Kojo
- Department of Pediatrics, Kagoshima Children's Hospital, Kagoshima, Japan
| | - Hiroki Kosakamoto
- Department of Internal Medicine, Kokubu Seikyo Hospital, Kagoshima, Japan
| | - Koji Sameshima
- Department of Pediatrics, Kagoshima City Hospital, Kagoshima, Japan
| | - Yoichi Kuroki
- Department of Internal Medicine, Koga General Hospital, Miyazaki, Japan
| | - Naomi Chibana
- Department of General Internal Medicine, Naha City Hospital, Okinawa, Japan
| | - Yuriko Doi
- Kagoshima City Public Health Center, Kagoshima, Japan
| | - Shuji Yoshino
- Clinical Microbiology Section, Miyazaki Prefectural Institute for Public Health and Environment, Miyazaki, Japan
| | - Tetsuya Harada
- Division of Microbiology, Osaka Institute of Public Health, Osaka, Japan
| | - Kazuko Seto
- Division of Microbiology, Osaka Institute of Public Health, Osaka, Japan
| | - Tetsuya Ikeda
- Department of Infectious Diseases, Hokkaido Institute of Public Health, Hokkaido, Japan
| | - Hiroaki Miyanohara
- Department of Clinical Laboratory, Kagoshima Prefectural Comprehensive Health Center, Kagoshima, Japan
| | - Koichiro Nakayama
- Microorganism Section, Kagoshima Prefectural Institute for Environmental Research and Public Health, Kagoshima, Japan
| | - Mutsuyo Gokuden
- Microorganism Section, Kagoshima Prefectural Institute for Environmental Research and Public Health, Kagoshima, Japan
| | - Naoko Imuta
- Department of Microbiology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Hideki Kawamura
- Department of Infection Control and Prevention, Kagoshima University Hospital, Kagoshima, Japan
| | - Yoshitoshi Ogura
- Department of Bacteriology, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan,Division of Microbiology, Department of Infectious Medicine, Kurume University, Fukuoka, Japan
| | - Tetsuya Hayashi
- Department of Bacteriology, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
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Ojiakor A, Gibbs RN, Chen Z, Gao X, Fowler CC. The evolutionary diversification of the Salmonella artAB toxin locus. Front Microbiol 2022; 13:1016438. [PMID: 36504768 PMCID: PMC9732031 DOI: 10.3389/fmicb.2022.1016438] [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: 08/10/2022] [Accepted: 10/07/2022] [Indexed: 11/27/2022] Open
Abstract
Salmonella enterica is a diverse species of bacterial pathogens comprised of >2,500 serovars with variable host ranges and virulence properties. Accumulating evidence indicates that two AB5-type toxins, typhoid toxin and ArtAB toxin, contribute to the more severe virulence properties of the Salmonella strains that encode them. It was recently discovered that there are two distinct types of artAB-like genetic elements in Salmonella: those that encode ArtAB toxins (artAB elements) and those in which the artA gene is degraded and the ArtB homolog, dubbed PltC, serves as an alternative delivery subunit for typhoid toxin (pltC elements). Here, we take a multifaceted approach to explore the evolutionary diversification of artAB-like genetic elements in Salmonella. We identify 7 subtypes of ArtAB toxins and 4 different PltC sequence groups that are distributed throughout the Salmonella genus. Both artAB and pltC are encoded within numerous diverse prophages, indicating a central role for phages in their evolutionary diversification. Genetic and structural analyses revealed features that distinguish pltC elements from artAB and identified evolutionary adaptations that enable PltC to efficiently engage typhoid toxin A subunits. For both pltC and artAB, we find that the sequences of the B subunits are especially variable, particularly amongst amino acid residues that fine tune the chemical environment of their glycan binding pockets. This study provides a framework to delineate the remarkably complex collection of Salmonella artAB/pltC-like genetic elements and provides a window into the mechanisms of evolution for AB5-type toxins.
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Affiliation(s)
- Adaobi Ojiakor
- Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada
| | - Rachel N. Gibbs
- Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada
| | - Zhe Chen
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Xiang Gao
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China,School of Life Sciences, Shandong University, Qingdao, China
| | - Casey C. Fowler
- Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada,*Correspondence: Casey C. Fowler,
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