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Martinez-Soto CE, McClelland M, Kropinski AM, Lin JT, Khursigara CM, Anany H. Multireceptor phage cocktail against Salmonella enterica to circumvent phage resistance. MICROLIFE 2024; 5:uqae003. [PMID: 38545601 PMCID: PMC10972627 DOI: 10.1093/femsml/uqae003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 01/18/2024] [Accepted: 03/11/2024] [Indexed: 04/14/2024]
Abstract
Non-Typhoidal Salmonella (NTS) is one of the most common food-borne pathogens worldwide, with poultry products being the major vehicle for pathogenesis in humans. The use of bacteriophage (phage) cocktails has recently emerged as a novel approach to enhancing food safety. Here, a multireceptor Salmonella phage cocktail of five phages was developed and characterized. The cocktail targets four receptors: O-antigen, BtuB, OmpC, and rough Salmonella strains. Structural analysis indicated that all five phages belong to unique families or subfamilies. Genome analysis of four of the phages showed they were devoid of known virulence or antimicrobial resistance factors, indicating enhanced safety. The phage cocktail broad antimicrobial spectrum against Salmonella, significantly inhibiting the growth of all 66 strains from 20 serovars tested in vitro. The average bacteriophage insensitive mutant (BIM) frequency against the cocktail was 6.22 × 10-6 in S. Enteritidis, significantly lower than that of each of the individual phages. The phage cocktail reduced the load of Salmonella in inoculated chicken skin by 3.5 log10 CFU/cm2 after 48 h at 25°C and 15°C, and 2.5 log10 CFU/cm2 at 4°C. A genome-wide transduction assay was used to investigate the transduction efficiency of the selected phage in the cocktail. Only one of the four phages tested could transduce the kanamycin resistance cassette at a low frequency comparable to that of phage P22. Overall, the results support the potential of cocktails of phage that each target different host receptors to achieve complementary infection and reduce the emergence of phage resistance during biocontrol applications.
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Affiliation(s)
- Carlos E Martinez-Soto
- Guelph Research and Development Centre, Agriculture and Agri-Food
Canada, 93 Stone Rd W, N1G 5C9, Guelph, Ontario,
Canada
- Department of Molecular and Cellular Biology, College of Biological
Science, University of Guelph, 50 Stone Rd E, N1G 2W1,
Guelph, Ontario, Canada
| | - Michael McClelland
- Department of Microbiology and Molecular Genetics, School of Medicine,
University of California, Irvine, 811 Health Sciences Road,
CA 92614, United States
| | - Andrew M Kropinski
- Department of Pathobiology, Ontario Veterinary College, University of
Guelph, Guelph, 419 Gordon St, Guelph, ON N1G
2W1, Canada
| | - Janet T Lin
- Guelph Research and Development Centre, Agriculture and Agri-Food
Canada, 93 Stone Rd W, N1G 5C9, Guelph, Ontario,
Canada
| | - Cezar M Khursigara
- Department of Molecular and Cellular Biology, College of Biological
Science, University of Guelph, 50 Stone Rd E, N1G 2W1,
Guelph, Ontario, Canada
| | - Hany Anany
- Guelph Research and Development Centre, Agriculture and Agri-Food
Canada, 93 Stone Rd W, N1G 5C9, Guelph, Ontario,
Canada
- Department of Molecular and Cellular Biology, College of Biological
Science, University of Guelph, 50 Stone Rd E, N1G 2W1,
Guelph, Ontario, Canada
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Gvaladze T, Lehnherr H, Hertwig S. A bacteriophage cocktail can efficiently reduce five important Salmonella serotypes both on chicken skin and stainless steel. Front Microbiol 2024; 15:1354696. [PMID: 38500580 PMCID: PMC10944927 DOI: 10.3389/fmicb.2024.1354696] [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: 12/12/2023] [Accepted: 02/19/2024] [Indexed: 03/20/2024] Open
Abstract
Salmonella is one of the most important zoonotic pathogens and is mostly transmitted through food of animal origin. Application of bacteriophages is a promising tool to biocontrol Salmonella on both food and food contact surfaces. In this study, we evaluated the effectiveness of a six-phage cocktail for the reduction of Salmonella Enteritidis and a mixture of five major Salmonella serotypes (S. Enteritidis, Salmonella Typhimurium, Salmonella Infantis, Salmonella Paratyphi B, and Salmonella Indiana) on chicken skin and stainless steel. A phage cocktail with a final concentration of 107 PFU/cm2 was sprayed on these surfaces. After adding the phage cocktail, the samples were incubated at RT (~23°C) for different periods of time. The phage cocktail caused a significant reduction of S. Enteritidis and the mixed culture on chicken skin 30 min after phage addition, with 1.8 log10 and 1 log10 units, respectively. Reduction rates (1.2-1.7 log10 units) on stainless steel after 30 min were similar. Four hours after addition, the phage cocktail caused a significant reduction on both surfaces up to 3 log10 units on chicken skin and 2.4 log10 units on stainless steel. In a further experiment, bacteria added to stainless steel were not allowed to dry to simulate a fresh bacterial contamination. In this case, the bacterial count of S. Enteritidis was reduced below the detection limit after 2 h. The results demonstrate that this phage cocktail has potential to be used in post-harvest applications to control Salmonella contaminations.
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Affiliation(s)
- Tamar Gvaladze
- Department of Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | | | - Stefan Hertwig
- Department of Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany
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3
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Abdelsattar AS, Eita MA, Hammouda ZK, Gouda SM, Hakim TA, Yakoup AY, Safwat A, El-Shibiny A. The Lytic Activity of Bacteriophage ZCSE9 against Salmonella enterica and Its Synergistic Effects with Kanamycin. Viruses 2023; 15:v15040912. [PMID: 37112892 PMCID: PMC10142335 DOI: 10.3390/v15040912] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 03/27/2023] [Accepted: 03/30/2023] [Indexed: 04/05/2023] Open
Abstract
Salmonella, the causative agent of several diseases in humans and animals, including salmonellosis, septicemia, typhoid fever, and fowl typhoid, poses a serious threat to global public health and food safety. Globally, reports of therapeutic failures are increasing because of the increase in bacterial antibiotic resistance. Thus, this work highlights the combined phage–antibiotic therapy as a promising approach to combating bacterial resistance. In this manner, the phage ZCSE9 was isolated, and the morphology, host infectivity, killing curve, combination with kanamycin, and genome analysis of this phage were all examined. Morphologically, phage ZCSE9 is a siphovirus with a relatively broad host range. In addition, the phage can tolerate high temperatures until 80 °C with one log reduction and a basic environment (pH 11) without a significant decline. Furthermore, the phage prevents bacterial growth in the planktonic state, according to the results of the time-killing curve. Moreover, using the phage at MOI 0.1 with kanamycin against five different Salmonella serotypes reduces the required antibiotics to inhibit the growth of the bacteria. Comparative genomics and phylogenetic analysis suggested that phage ZCSE9, along with its close relatives Salmonella phages vB_SenS_AG11 and wksl3, belongs to the genus Jerseyvirus. In conclusion, phage ZCSE9 and kanamycin form a robust heterologous antibacterial combination that enhances the effectiveness of a phage-only approach for combating Salmonella.
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Affiliation(s)
- Abdallah S. Abdelsattar
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza 12578, Egypt
| | - Mohamed Atef Eita
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza 12578, Egypt
| | - Zainab K. Hammouda
- Microbiology and Immunology Department, Faculty of Pharmacy, October University for Modern Sciences and Arts (MSA), Giza 11787, Egypt
| | - Shrouk Mohamed Gouda
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza 12578, Egypt
| | - Toka A. Hakim
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza 12578, Egypt
| | - Aghapy Yermans Yakoup
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza 12578, Egypt
| | - Anan Safwat
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza 12578, Egypt
| | - Ayman El-Shibiny
- Center for Microbiology and Phage Therapy, Zewail City of Science and Technology, Giza 12578, Egypt
- Faculty of Environmental Agricultural Sciences, Arish University, Arish 45511, Egypt
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Wang Q, Thiam M, Barreto Sánchez AL, Wang Z, Zhang J, Li Q, Wen J, Zhao G. Gene Co-Expression Network Analysis Reveals the Hub Genes and Key Pathways Associated with Resistance to Salmonella Enteritidis Colonization in Chicken. Int J Mol Sci 2023; 24:ijms24054824. [PMID: 36902251 PMCID: PMC10003191 DOI: 10.3390/ijms24054824] [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: 11/12/2022] [Revised: 01/16/2023] [Accepted: 02/14/2023] [Indexed: 03/06/2023] Open
Abstract
Salmonella negatively impacts the poultry industry and threatens animals' and humans' health. The gastrointestinal microbiota and its metabolites can modulate the host's physiology and immune system. Recent research demonstrated the role of commensal bacteria and short-chain fatty acids (SCFAs) in developing resistance to Salmonella infection and colonization. However, the complex interactions among chicken, Salmonella, host-microbiome, and microbial metabolites remain unelucidated. Therefore, this study aimed to explore these complex interactions by identifying the driver and hub genes highly correlated with factors that confer resistance to Salmonella. Differential gene expression (DEGs) and dynamic developmental genes (DDGs) analyses and weighted gene co-expression network analysis (WGCNA) were performed using transcriptome data from the cecum of Salmonella Enteritidis-infected chicken at 7 and 21 days after infection. Furthermore, we identified the driver and hub genes associated with important traits such as the heterophil/lymphocyte (H/L) ratio, body weight post-infection, bacterial load, propionate and valerate cecal contents, and Firmicutes, Bacteroidetes, and Proteobacteria cecal relative abundance. Among the multiple genes detected in this study, EXFABP, S100A9/12, CEMIP, FKBP5, MAVS, FAM168B, HESX1, EMC6, and others were found as potential candidate gene and transcript (co-) factors for resistance to Salmonella infection. In addition, we found that the PPAR and oxidative phosphorylation (OXPHOS) metabolic pathways were also involved in the host's immune response/defense against Salmonella colonization at the earlier and later stage post-infection, respectively. This study provides a valuable resource of transcriptome profiles from chicken cecum at the earlier and later stage post-infection and mechanistic understanding of the complex interactions among chicken, Salmonella, host-microbiome, and associated metabolites.
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Use of Phages to Treat Antimicrobial-Resistant Salmonella Infections in Poultry. Vet Sci 2022; 9:vetsci9080438. [PMID: 36006353 PMCID: PMC9416511 DOI: 10.3390/vetsci9080438] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 07/11/2022] [Accepted: 07/13/2022] [Indexed: 01/18/2023] Open
Abstract
Simple Summary Salmonellosis, an infection in humans and animals caused by Salmonella spp., poses a major concern to public health and food safety worldwide. Antibiotics are mostly prescribed to treat salmonellosis. Unfortunately, indiscriminate use of antibiotics leads to the emergence and transmission of multidrug-resistant Salmonella spp. As antibiotics are becoming increasingly ineffective, infections caused by MDR strains will be difficult to manage. The search for an alternative to antibiotics has led scientists to give renewed attention on phage therapy. Though commercial use of phages for controlling Salmonella in poultry is still in its early stage, the use of lytic phages is considered an environmentally friendly, cost-effective, and sustainable antimicrobial approach. Moreover, it provides advantages over antibiotics in terms of specificity, cost of development, resistance, and genetic amenability. Studies on laboratory and field scale use show promise on the effectiveness of phages against MDR Salmonella spp. However, inadequate data on safety of phage use, phage stability, and lack of regulatory framework remain major obstacles in the commercial application of phages. Our article provides a comprehensive overview on global prevalence and antimicrobial resistance of Salmonella in poultry, the efforts to control Salmonella using phage therapy, and challenges as well as future prospects of phage therapy. Abstract Salmonellosis is one of the most common bacterial infections that impacts both human health and poultry production. Although antibiotics are usually recommended for treating Salmonella infections, their misuse results in the evolution and spread of multidrug-resistant (MDR) bacteria. To minimize the health and economic burdens associated with antimicrobial resistance, a novel antibacterial strategy that can obliterate pathogens without any adverse effects on humans and animals is urgently required. Therefore, therapeutic supplementation of phages has gained renewed attention because of their unique ability to lyse specific hosts, cost-effective production, environmentally-friendly properties, and other potential advantages over antibiotics. In addition, the safety and efficacy of phage therapy for controlling poultry-associated Salmonella have already been proven through experimental studies. Phages can be applied at every stage of poultry production, processing, and distribution through different modes of application. Despite having a few limitations, the optimized and regulated use of phage cocktails may prove to be an effective option to combat infections caused by MDR pathogens in the post-antibiotic era. This article mainly focuses on the occurrence of salmonellosis in poultry and its reduction with the aid of bacteriophages. We particularly discuss the prevalence of Salmonella infections in poultry and poultry products; review the trends in antibiotic resistance; and summarize the application, challenges, and prospects of phage therapy in the poultry industry.
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Bacteriophage and their lysins: A new era of biocontrol for inactivation of pathogenic bacteria in poultry processing and production—A review. Food Control 2022. [DOI: 10.1016/j.foodcont.2022.108976] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Thiam M, Wang Q, Barreto Sánchez AL, Zhang J, Ding J, Wang H, Zhang Q, Zhang N, Wang J, Li Q, Wen J, Zhao G. Heterophil/Lymphocyte Ratio Level Modulates Salmonella Resistance, Cecal Microbiota Composition and Functional Capacity in Infected Chicken. Front Immunol 2022; 13:816689. [PMID: 35493492 PMCID: PMC9047862 DOI: 10.3389/fimmu.2022.816689] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 03/15/2022] [Indexed: 12/13/2022] Open
Abstract
The gastrointestinal microbiota plays a vital role in ensuring the maintenance of host health through interactions with the immune system. The Heterophil/Lymphocyte (H/L) ratio reflects poultry’s robustness and immune system status. Chickens with low H/L ratio are superior to the chickens with high H/L ratio in survival, immune response, and resistance to Salmonella infection, but the underlying mechanisms remain unclear. This study aimed to identify microorganisms associated with resistance to Salmonella Enteritidis infection in chickens based on the H/L ratio. The 16S rRNA and metagenomic analysis were conducted to examine microbiome and functional capacity between the 2 groups, and Short Chain Fatty Acids (SCFAs) and histopathology were conducted to explore the potential difference between susceptible and resistant groups at 7 and 21 days post-infection (dpi). The microbiome exploration revealed that low H/L ratio chickens, compared to high H/L ratio chickens, displayed a significantly higher abundance of Proteobacteria (Escherichia coli) and Bacteroidetes (Bacteroides plebeius) at 7 and 21 dpi, respectively. Anaerostipes (r = 0.63) and Lachnoclostridium (r = 0.63) were identified as bacterial genus significantly correlated with H/L (P < 0.001). Interestingly, Bacteroides was significantly and positively correlated with bodyweight post-infection (r = 0.72), propionate (r = 0.78) and valerate (r = 0.82) contents, while Salmonella was significantly and negatively correlated with bodyweight post-infection (r = − 0.67), propionate (r = − 0.61) and valerate (r = − 0.65) contents (P < 0.001). Furthermore, the comparative analysis of the functional capacity of cecal microbiota of the chickens with high and low H/L ratio revealed that the chickens with low H/L ratio possess more enriched immune pathways, lower antibiotic resistance genes and virulence factors compared to the chickens with high H/L ratio. These results suggest that the chickens with low H/L ratio are more resistant to Salmonella Enteritidis, and it is possible that the commensal Proteobacteria and Bacteroidetes are involved in this resistance against Salmonella infection. These findings provide valuable resources for selecting and breeding disease-resistant chickens.
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Almutairi M, Imam M, Alammari N, Hafiz R, Patel F, Alajel S. Using Phages to Reduce Salmonella Prevalence in Chicken Meat: A Systematic Review. PHAGE (NEW ROCHELLE, N.Y.) 2022; 3:15-27. [PMID: 36161190 PMCID: PMC9041517 DOI: 10.1089/phage.2021.0017] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
Salmonellosis is an infection that significantly impacts chicken and humans who consume it; it is a burden on public health and a contributor to commercial losses in the chicken industry worldwide. To tackle chicken meat-related bacterial infections, significant quantities of antibiotics alongside several infection prevention measures are used worldwide. However, chemical additives, such as organic acids, and chlorine-based interventions all have different limitations. These include feed refusal due to a change of taste, and incompatibility between organic acids and other inoculated preservative agents such as antimicrobial agents. Phages are host-specific viruses that interact with bacteria in a specific manner. Therefore, they possess unique biological and therapeutic features that can be used to reduce bacterial contamination, leading to improved food safety and quality. This systematic review examines the current evidence regarding the effectiveness of various phages on Salmonella colonization in chicken meat. This review summarizes findings from 17 studies that were conducted in vitro with similar experimental conditions (temperature and incubation parameters) to test the efficacy of isolated and commercially available phages on chicken raw meat samples. The current evidence suggests that most of the in vitro studies that used phages as a biocontrol to eradicate Salmonella contamination in chicken meat were successful. This indicates that phages constitute a promising solution worldwide for tackling foodborne bacteria, including Salmonella.
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Affiliation(s)
| | - Mohammed Imam
- Department of Medical Microbiology, Qunfudah Faculty of Medicine, Umm Al-Qura University, Al-Qunfudah, Saudi Arabia
| | | | - Radwan Hafiz
- Saudi Food and Drug Authority, Riyadh, Saudi Arabia
| | - Faizal Patel
- Department of Genetics and Genome Biology, University of Leicester, Leicester, United Kingdom
| | - Sulaiman Alajel
- Saudi Food and Drug Authority, Riyadh, Saudi Arabia
- Address for correspondence: Suliman Alajel, PhD, Saudi Food and Drug Authority, 4904 Northern Ring Road, Hittin-Riyadh 13513-7148, Saudi Arabia
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Huang J, Liang L, Cui K, Li P, Hao G, Sun S. Salmonella phage CKT1 significantly relieves the body weight loss of chicks by normalizing the abnormal intestinal microbiome caused by hypervirulent Salmonella Pullorum. Poult Sci 2022; 101:101668. [PMID: 35063807 PMCID: PMC8784326 DOI: 10.1016/j.psj.2021.101668] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 12/13/2022] Open
Abstract
Pullorum disease caused by Salmonella Pullorum remains an important disease for the poultry industry due to high morbidity and mortality in many countries. Phage therapy is becoming an alternative strategy to control multidrug-resistant Salmonella infections in young chicks. However, how bacteriophages affect the growth performance of chicks infected with S. Pullorum remains poorly understood. Herein, we assessed the therapeutic efficacy of Salmonella phage CKT1 against hypervirulent arthritis-causing S. Pullorum. The results showed that single phage treatment after hypervirulent S. Pullorum infection significantly improved body weight loss of chicks. Compared with enlarged liver and spleen in only Salmonella challenged group, phage administration substantially reduced the liver/body and spleen/body weight ratios, bacterial loads in organs and the degree of hepatic sinusoidal dilatation and congestion. Moreover, phage CKT1 can enter the organs of chicks and stay for at least 3 d in liver and spleen, and promote higher serum levels of IL-6 production within 6 d postinfection, indicating phage-induced bacterial lysis may be involved in inflammatory immune response to S. Pullorum infection. Analysis of the microbiome of gastrointestinal tract of chicks demonstrated that Salmonella challenge significantly reduced the relative abundances of Lachnoclostridium and Blautia, resulting in remarkably increased Escherichia-Shigella and Klebsiella becoming the predominant bacterial taxa. In contrast, the use of phage CKT1 significantly reduced Escherichia-Shigella and Klebsiella populations in intestine, permitting the proliferation of beneficial microbiota in Firmicutes including Lachnoclostridium, Ruminococcus, Lactobacillus, and Pseudoflavonifractor. In addition, phage alone treatments did not affect the normal gut microbiota structure of chicks, and phage therapy on Salmonella infected chicks increased bacteria species richness in the cecum. These results suggest that Salmonella phage CKT1 could improve growth performance of chicks challenged with S. Pullorum by normalizing the abnormal intestinal microbiome.
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Affiliation(s)
- Jiaqi Huang
- Department of Preventive Veterinary Medicine, College of Animal Science and Technology, Shandong Agricultural University, Tai' an, China
| | - Lu Liang
- Department of Preventive Veterinary Medicine, College of Animal Science and Technology, Shandong Agricultural University, Tai' an, China
| | - Ketong Cui
- Department of Preventive Veterinary Medicine, College of Animal Science and Technology, Shandong Agricultural University, Tai' an, China
| | - Peiyong Li
- Department of Preventive Veterinary Medicine, College of Animal Science and Technology, Shandong Agricultural University, Tai' an, China
| | - Guijuan Hao
- Department of Preventive Veterinary Medicine, College of Animal Science and Technology, Shandong Agricultural University, Tai' an, China
| | - Shuhong Sun
- Department of Preventive Veterinary Medicine, College of Animal Science and Technology, Shandong Agricultural University, Tai' an, China.
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The lytic siphophage vB_StyS-LmqsSP1 reduces Salmonella Typhimurium isolates on chicken skin. Appl Environ Microbiol 2021; 87:e0142421. [PMID: 34586906 DOI: 10.1128/aem.01424-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Phage-based biocontrol of bacteria is considered as a natural approach to combat food-borne pathogens. Salmonella spp. are notifiable and highly prevalent pathogens that cause foodborne diseases globally. In this study, six bacteriophages were isolated and further characterized that infect food-derived Salmonella isolates from different meat sources. The siphovirus VB_StyS-LmqsSP1, which was isolated from a cow´s nasal swab, was further subjected to in-depth characterization. Phage-host interaction investigations in liquid medium showed that vB_StyS-LmqsSP1 can suppress the growth of Salmonella spp. isolates at 37°C for ten hours and reduce the bacterial titer at 4°C significantly. A reduction of 1.4 to 3 log units was observed in investigations with two food-derived Salmonella isolates and one reference strain under cooling conditions using MOIs of 104 and 105. Phage application on chicken skin resulted in a reduction of about 2 log units in the tested Salmonella isolates from the first three hours throughout a one-week experiment at cooling temperature and an MOI of 105. The one-step growth curve analysis using vB_StyS-LmqsSP1 demonstrated a 60-min latent period and a burst size of 50-61 PFU/infected cell for all tested hosts. Furthermore, the genome of the phage was determined to be free from genes causing undesired effects. Based on the phenotypic and genotypic properties, LmqsSP1 was assigned as a promising candidate for biocontrol of Salmonella Typhimurium in food. Importance: Salmonella enterica is one of the major global causes of foodborne enteritis in humans. The use of chemical sanitizers for reducing bacterial pathogens in the food chain can result in the spread of bacterial resistance. Targeted and clean label intervention strategies can reduce Salmonella contamination in food. The significance of our research demonstrates the suitability of a bacteriophage (vB_StyS-LmqsSP1) for biocontrol of Salmonella enterica serovar Typhimurium on poultry due to its lytic efficacy under conditions prevailing in food production environments.
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Wessels K, Rip D, Gouws P. Salmonella in Chicken Meat: Consumption, Outbreaks, Characteristics, Current Control Methods and the Potential of Bacteriophage Use. Foods 2021; 10:1742. [PMID: 34441520 PMCID: PMC8394320 DOI: 10.3390/foods10081742] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 07/22/2021] [Accepted: 07/25/2021] [Indexed: 12/12/2022] Open
Abstract
The control of Salmonella in chicken processing plants is an ongoing challenge for many factories around the globe, especially with the increasing demand for poultry escalating processing throughputs. Foodborne outbreaks due to Salmonella still pose a prominent risk to public health. As chicken meat is a good reservoir for Salmonella, it is important for chicken processing plants to continuously optimize methods to reduce the incidence of Salmonella on their products. Current methods include the use of chemical antimicrobials such as chlorine-containing compounds and organic acids. However, these current methods are decreasing in popularity due to the rising rate of Salmonella resistance, coupled with the challenge of preserving the sensory properties of the meat, along with the increasing stringency of antimicrobial use. Bacteriophages are becoming more appealing to integrate into the large-scale hurdle concept. A few factors need to be considered for successful implementation, such as legislation, and application volumes and concentrations. Overall, bacteriophages show great potential because of their host specificity, guaranteeing an alternative outcome to the selective pressure for resistant traits placed by chemicals on whole microbial communities.
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Affiliation(s)
| | | | - Pieter Gouws
- Centre for Food Safety, Department of Food Science, Stellenbosch University, Stellenbosch 7600, South Africa; (K.W.); (D.R.)
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12
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Kaczorek-Łukowska E, Sowińska P, Franaszek A, Dziewulska D, Małaczewska J, Stenzel T. Can domestic pigeon be a potential carrier of zoonotic Salmonella? Transbound Emerg Dis 2020; 68:2321-2333. [PMID: 33091215 PMCID: PMC8359358 DOI: 10.1111/tbed.13891] [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: 03/20/2020] [Revised: 10/14/2020] [Accepted: 10/18/2020] [Indexed: 12/31/2022]
Abstract
Salmonellosis is one of the most important bacterial diseases in pigeons. This study aimed to estimate the prevalence of Salmonella spp. in domestic pigeons (Columba livia f. domestica) in Poland, its antimicrobial susceptibility (both phenotypic and genotypic), and its capability for biofilm formation. The presence of selected virulence genes, nucleotide homology of selected genes, and susceptibility to bacteriophages were investigated as well. From the 585 pigeons tested, 5.47% turned out positive. All isolated strains were recognized as Salmonella enterica ser. Typhimurium. The asymptomatic pigeons were carriers of 37.5% of the isolates. The dominant variants were as follows: 1,4,[5],12,:i:1,2 (53.13%) and 1,4,[5],12,:‐:‐ (31.25%). Most of the strains analysed showed the ability to produce biofilm after 24 and 48 hr of incubation (59.38% and 53.13%, respectively). Over 90% of the strains were confirmed for lpfA, agafA, invA, sivH, and avrA virulence genes. Also, of the thirteen antimicrobial susceptibility genes, the following were confirmed: sul1, tet(A), blaTEM‐1, floR, strA, and strB. The most common were the strB (18%) and tet(A) (12%) genes that are responsible for coding resistance to aminoglycosides and tetracyclines, respectively. Most of the strains were phenotypically resistant to oxytetracycline (46.88%), neomycin (53.13%) and tylosin (100%). The susceptibility of the investigated Salmonella strains to the bacteriophages was between 33% and 100%. MLST, PCR MP and ERIC PCR analyses indicated a very high genetic similarity of the investigated strains (over 99%). Results of our study indicate that Salmonella enterica ser. Typhimurium is still an important agent in domestic pigeons and that its antimicrobial resistance increases. Alarming is also the confirmation of a single‐phase variant 1,4,[5],12:i,‐, which could have increased virulence and multi‐drug resistance encoded on the plasmid. Most importantly, however, such strains have been isolated from humans with clinical symptoms of Salmonella infection.
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Affiliation(s)
- Edyta Kaczorek-Łukowska
- Department of Microbiology and Clinical Immunology, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | | | | | - Daria Dziewulska
- Department of Poultry Diseases, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Joanna Małaczewska
- Department of Microbiology and Clinical Immunology, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Tomasz Stenzel
- Department of Poultry Diseases, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
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