1
|
Li H, Wu Y, Feng D, Jiang Q, Li S, Rong J, Zhong L, Methner U, Baxter L, Ott S, Falush D, Li Z, Deng X, Lu X, Ren Y, Kan B, Zhou Z. Centralized industrialization of pork in Europe and America contributes to the global spread of Salmonella enterica. NATURE FOOD 2024; 5:413-422. [PMID: 38724686 PMCID: PMC11132987 DOI: 10.1038/s43016-024-00968-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Accepted: 03/26/2024] [Indexed: 05/16/2024]
Abstract
Salmonella enterica causes severe food-borne infections through contamination of the food supply chain. Its evolution has been associated with human activities, especially animal husbandry. Advances in intensive farming and global transportation have substantially reshaped the pig industry, but their impact on the evolution of associated zoonotic pathogens such as S. enterica remains unresolved. Here we investigated the population fluctuation, accumulation of antimicrobial resistance genes and international serovar Choleraesuis transmission of nine pig-enriched S. enterica populations comprising more than 9,000 genomes. Most changes were found to be attributable to the developments of the modern pig industry. All pig-enriched salmonellae experienced host transfers in pigs and/or population expansions over the past century, with pigs and pork having become the main sources of S. enterica transmissions to other hosts. Overall, our analysis revealed strong associations between the transmission of pig-enriched salmonellae and the global pork trade.
Collapse
Affiliation(s)
- Heng Li
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
- Suzhou Key Laboratory of Pathogen Bioscience and Anti-infective Medicine, Jiangsu Province Engineering Research Center of Precision Diagnostics and Therapeutics Development, Soochow University, Suzhou, China
| | - Yilei Wu
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
- Department of Biological Sciences, Xi'an Jiaotong-Liverpool University, Suzhou, China
| | - Dan Feng
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
- Suzhou Key Laboratory of Pathogen Bioscience and Anti-infective Medicine, Jiangsu Province Engineering Research Center of Precision Diagnostics and Therapeutics Development, Soochow University, Suzhou, China
| | - Quangui Jiang
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
- Suzhou Key Laboratory of Pathogen Bioscience and Anti-infective Medicine, Jiangsu Province Engineering Research Center of Precision Diagnostics and Therapeutics Development, Soochow University, Suzhou, China
| | - Shengkai Li
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
| | - Jie Rong
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
| | - Ling Zhong
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
| | - Ulrich Methner
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena, Germany
| | - Laura Baxter
- Warwick Bioinformatics Research Technology Platform, University of Warwick, Coventry, UK
| | - Sascha Ott
- Warwick Medical School, University of Warwick, Coventry, UK
| | - Daniel Falush
- The Center for Microbes, Development and Health, CAS Key Laboratory of Molecular Virology and Immunology, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China
| | - Zhenpeng Li
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Xiangyu Deng
- Center for Food Safety, University of Georgia, Griffin, GA, USA
| | - Xin Lu
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
| | - Yi Ren
- Iotabiome Biotechnology Inc., Suzhou, China.
| | - Biao Kan
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
| | - Zhemin Zhou
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China.
- Suzhou Key Laboratory of Pathogen Bioscience and Anti-infective Medicine, Jiangsu Province Engineering Research Center of Precision Diagnostics and Therapeutics Development, Soochow University, Suzhou, China.
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
| |
Collapse
|
2
|
Weinert LA, Tucker AWD. Lessons from birth to decline of pig-adapted Salmonella. NATURE FOOD 2024; 5:359-360. [PMID: 38730272 DOI: 10.1038/s43016-024-00986-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2024]
Affiliation(s)
- Lucy A Weinert
- Department of Vet Medicine, University of Cambridge, Cambridge, UK.
| | - A W Dan Tucker
- Department of Vet Medicine, University of Cambridge, Cambridge, UK
| |
Collapse
|
3
|
Soliani L, Rugna G, Prosperi A, Chiapponi C, Luppi A. Salmonella Infection in Pigs: Disease, Prevalence, and a Link between Swine and Human Health. Pathogens 2023; 12:1267. [PMID: 37887782 PMCID: PMC10610219 DOI: 10.3390/pathogens12101267] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 10/12/2023] [Accepted: 10/20/2023] [Indexed: 10/28/2023] Open
Abstract
Salmonella is one of the most spread foodborne pathogens worldwide, and Salmonella infections in humans still represent a global health burden. The main source of Salmonella infections in humans is represented by contaminated animal-derived foodstuffs, with pork products being one of the most important players. Salmonella infection in swine is critical not only because it is one of the main causes of economic losses in the pork industry, but also because pigs can be infected by several Salmonella serovars, potentially contaminating the pig meat production chain and thus posing a significant threat to public health globally. As of now, in Europe and in the United States, swine-related Salmonella serovars, e.g., Salmonella Typhimurium and its monophasic variant Salmonella enterica subsp. enterica 1,4,[5],12:i:-, are also frequently associated with human salmonellosis cases. Moreover, multiple outbreaks have been reported in the last few decades which were triggered by the consumption of Salmonella-contaminated pig meat. Throughout the years, changes and evolution across the pork industry may have acted as triggers for new issues and obstacles hindering Salmonella control along the food chain. Gathered evidence reinforces the importance of coordinating control measures and harmonizing monitoring programs for the efficient control of Salmonella in swine. This is necessary in order to manage outbreaks of clinical disease in pigs and also to protect pork consumers by controlling Salmonella subclinical carriage and shedding. This review provides an update on Salmonella infection in pigs, with insights on Salmonella ecology, focusing mainly on Salmonella Choleraesuis, S. Typhimurium, and S. 1,4,[5],12:i:-, and their correlation to human salmonellosis cases. An update on surveillance methods for epidemiological purposes of Salmonella infection in pigs and humans, in a "One Health" approach, will also be reported.
Collapse
Affiliation(s)
- Laura Soliani
- Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia-Romagna (IZSLER), 25124 Brescia, Italy; (G.R.); (A.P.); (C.C.); (A.L.)
| | | | | | | | | |
Collapse
|
4
|
Fjelkner J, Hultén C, Jacobson M, Nörregård E, Young B. Salmonella enterica subspecies enterica serovar Choleraesuis in a Swedish gilt-producing herd, a case report. Porcine Health Manag 2023; 9:35. [PMID: 37507796 PMCID: PMC10375609 DOI: 10.1186/s40813-023-00329-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 06/23/2023] [Indexed: 07/30/2023] Open
Abstract
BACKGROUND When Salmonella enterica subspecies enterica serovar Choleraesuis (S. Choleraesuis) was detected in faecal samples collected within the Swedish Salmonella surveillance program from a gilt multiplying herd in September 2020, S. Choleraesuis had not been detected in domestic pigs or wild boar in Sweden for over 40 years. This report describes the subsequent investigation, identification of possible entry routes and measures undertaken to eliminate the pathogen from the herd. CASE PRESENTATION In accordance with Swedish regulations, pig movements to and from the farm were restricted, internal biosecurity measures were enhanced, and a test-and-remove strategy was implemented. Testing included repeated faecal sampling, tissue samplings from all dead or euthanized pigs, and serological sampling of replacement gilts. Epidemiological investigations included scrutinising of production records, employee interviews, analysing feed and environmental samples, faecal samples from the herd's purebred gilt supplier, and tissue and faecal samples from wild boars in the adjacent area. Testing of in-contact herds receiving gilts (n = 15) or 30-kg pigs (n = 7) from the multiplier included whole-herd faecal sampling and tissue cultures from pigs that died with signs of septicaemia. In total, S. Choleraesuis was detected in 12/4200 faecal and 5/1350 tissue samples from the herd, and the corresponding groups of pigs were euthanized. All feed and environmental samples as well as samples from the gilt supplier were negative. Testing of contact herds resulted in the identification and culling of one group of S. Choleraesuis-positive gilts. Replacement gilts introduced to the herd from January until May 2021 remained serologically negative during a surveillance-period of five months. CONCLUSION Although speculative, the epidemiological investigation identified indirect transmission from wild boar as possible source of introduction to the herd. Whole-genome sequencing of S. Choleraesuis isolates from wild boar in the area showed that they clustered with isolates from the herd. Repeated testing of the herd indicated that the test-and-remove strategy was successful. In August 2021, all restrictions were removed, and the herd was re-instated as a gilt producing herd. Compensation from the Swedish state to the farmer for production losses, culled animals and extra costs associated with the elimination cost totalled SEK 7 992 234.
Collapse
Affiliation(s)
| | | | | | - Erik Nörregård
- Farm & Animal Health, Box 164, Staffanstorp, 245 22, Sweden
| | - Beth Young
- National Veterinary Institute, Uppsala, Sweden
| |
Collapse
|
5
|
Gil‐Molino M, Gonçalves P, Risco D, Martín‐Cano FE, García A, Rey J, Fernández‐Llario P, Quesada A. Dissemination of antimicrobial-resistant isolates of Salmonella spp. in wild boars and its relationship with management practices. Transbound Emerg Dis 2022; 69:e1488-e1502. [PMID: 35182450 PMCID: PMC9790216 DOI: 10.1111/tbed.14480] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 02/08/2022] [Accepted: 02/10/2022] [Indexed: 12/30/2022]
Abstract
Antimicrobial resistance (AMR) is a global concern and controlling its spread is critical for the effectiveness of antibiotics. Members of the genus Salmonella are broadly distributed, and wild boar may play an important role in its circulation between peri-urban areas and the environment, due to its frequent interactions both with livestock or human garbage. As the population of these animals is rising due to management on certain hunting estates or the absence of natural predators, the aim of the present work is to identify the mechanisms of AMR present and/or expressed in Salmonella spp. from wild boar populations and to determine the possible role of management-related factors applied to different game estates located in central Spain. The detection of Salmonella spp. was carried out in 121 dead wild boar from 24 game estates, and antimicrobial resistance traits were determined by antibiotic susceptibility testing and screening for their genetic determinants. The effects of feeding supplementation, the proximity of livestock, the existence of a surrounding fence and the density of wild boar on the AMR of the isolates were evaluated. The predominant subspecies and serovar found were S. enterica subsp. enterica (n = 69) and S. choleraesuis (n = 33), respectively. The other subspecies found were S. enterica subsp. diarizonae, S. enterica subsp. salamae and S. enterica subsp. houtenae. AMR was common among isolates (75.2%) and 15.7% showed multi drug resistance (MDR). Resistance to sulphonamides was the most frequent (85.7%), as well as sul1 which was the AMR determinant most commonly found. Plasmids appeared in 38.8% of the isolates, with IncHI1 being the replicon detected with the highest prevalence. The AMR of the isolates increased when the animals were raised with feeding supplementation and enclosed by fences around the estates.
Collapse
Affiliation(s)
- María Gil‐Molino
- Facultad de Veterinaria, Unidad de Patología InfecciosaUniversidad de ExtremaduraCáceresSpain
| | - Pilar Gonçalves
- Innovación en Gestión y Conservación de Ingulados S.L. CáceresCáceresSpain
| | - David Risco
- Innovación en Gestión y Conservación de Ingulados S.L. CáceresCáceresSpain,Neobeitar S.L. CáceresCáceresSpain
| | | | | | - Joaquín Rey
- Facultad de Veterinaria, Unidad de Patología InfecciosaUniversidad de ExtremaduraCáceresSpain
| | | | - Alberto Quesada
- Facultad de Veterinaria, Departamento de BioquímicaBiología Molecular y Genética, Universidad de ExtremaduraCáceresSpain,INBIO G+CUniversidad de ExtremaduraCáceresSpain
| |
Collapse
|
6
|
Ramtahal MA, Amoako DG, Ismail A, Bester L, Abia ALK, Essack SY. Salmonella Yoruba: a rare serotype revealed through genomic sequencing along the farm-to-fork continuum of an intensive poultry farm in KwaZulu-Natal, South Africa. Acta Trop 2022; 234:106620. [PMID: 35907503 DOI: 10.1016/j.actatropica.2022.106620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 07/08/2022] [Accepted: 07/26/2022] [Indexed: 11/01/2022]
Abstract
Salmonella enterica is a zoonotic pathogen of worldwide public health importance. We characterised Salmonella isolates from poultry along the farm-to-fork continuum using whole genome sequencing (WGS) and bioinformatics analysis. Three multilocus sequence types (MLSTs), i.e., ST15 (1.9%), ST152 (5.9%) and ST1316 (92.2%) and three serotypes, i.e., S. Heidelberg (1.9%), Kentucky (5.9%) and Yoruba (92.2%) were detected. The rare serotype, S. Yoruba, was detected among the farm and abattoir isolates and contained resistance and virulence determinants. Resistome analysis revealed the presence of the aac(6')-Iaa gene associated with aminoglycoside resistance, a single point mutation in the parC gene associated with fluoroquinolone and quinolone resistance, and a single isolate contained the fosA7 gene responsible for fosfomycin resistance. No antibiotic resistance genes (ARGs) were identified for isolates phenotypically non-susceptible to azithromycin, cephalosporins, chloramphenicol and nitrofurantoin and resistance was thought to be attributable to other resistance mechanisms. The fully susceptible profiles observed for the wastewater isolates suggest that the poultry environment may receive antibiotic-resistant strains and resistance determinants from poultry with the potential of becoming a pathway of Salmonella transmission along the continuum. Six plasmids were identified and were only carried by 92.2% of the S. Yoruba isolates in varying combinations. Four plasmids were common to all S. Yoruba isolates along the continuum; isolates from the litter and faeces on the farm contained two additional plasmids. Ten Salmonella pathogenicity islands (SPIs) and 177 virulence genes were identified; some were serotype-specific. Phylogenetic analysis of S. Heidelberg and Kentucky showed that isolates were related to animal and human isolates from other countries. Phylogenetic analysis among the S. Yoruba isolates revealed four clades based on the isolate sources along the farm-to-fork continuum. Although the transmission of Salmonella strains along the farm-to-fork continuum was not evident, pathogenic, resistant Salmonella present in the poultry production chain poses a food safety risk. WGS analysis can provide important information on the spread, resistance, pathogenicity, and epidemiology of isolates and new, rare or emerging Salmonella strains to develop intervention strategies to improve food safety.
Collapse
Affiliation(s)
- Melissa A Ramtahal
- Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Durban 4000, South Africa.
| | - Daniel G Amoako
- Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Durban 4000, South Africa; Centre for Respiratory Diseases and Meningitis, National Institute for Communicable Diseases, Johannesburg 2131, South Africa
| | - Arshad Ismail
- Core Sequencing Facility, National Institute for Communicable Diseases, Johannesburg 2131, South Africa
| | - Linda Bester
- Biomedical Research Unit, School of Laboratory Medicine and Medical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban 4000, South Africa
| | - Akebe L K Abia
- Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Durban 4000, South Africa; Environmental Research Foundation, Westville 3630, KwaZulu-Natal
| | - Sabiha Y Essack
- Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Durban 4000, South Africa
| |
Collapse
|
7
|
Ernholm L, Sternberg-Lewerin S, Ågren E, Ståhl K, Hultén C. First Detection of Salmonella enterica Serovar Choleraesuis in Free Ranging European Wild Boar in Sweden. Pathogens 2022; 11:pathogens11070723. [PMID: 35889969 PMCID: PMC9324790 DOI: 10.3390/pathogens11070723] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 06/20/2022] [Accepted: 06/23/2022] [Indexed: 11/16/2022] Open
Abstract
Following the first detection of Salmonella enterica subsp. enterica, serovar Choleraesuis (S. Choleraesuis) in a Swedish pig herd for more than 40 years and subsequent detection of the same serotype in an enclosure with kept wild boar, a national surveillance for S. Choleraesuis in free living wild boar was launched. A total of 633 wild boar sampled within the active and the enhanced passive surveillance were examined for Salmonella enterica serovars by culture. Of these, 80 animals were culture positive for S. Choleraesuis var. Kunzendorf. All positive animals, including those in the original outbreaks, originated from counties located in the southern and eastern parts of Sweden. Fifty-eight isolates were selected for sequence typing, revealing a relatively homogenous population of S. Choleraesuis with two distinct genetic clusters containing isolates from the southern counties in one and the counties further northeast in the other. Sequenced isolates from domestic pig farms all clustered with wild boar in the same region. S. Choleraesuis appears highly contagious in dense wild boar populations, making it a relevant model for other infectious diseases that may be transmitted to pigs. The many potential routes of introduction and spread of S. Choleraesuis warrant further investigations in order to prepare for other disease threats.
Collapse
Affiliation(s)
- Linda Ernholm
- Department of Biomedical Sciences and Veterinary Public Health, Faculty of Veterinary Medicine and Animal Science, Swedish University of Agricultural Sciences (SLU), SE-750 07 Uppsala, Sweden;
- Department of Disease Control and Epidemiology, National Veterinary Institute (SVA), SE-751 89 Uppsala, Sweden; (K.S.); (C.H.)
| | - Susanna Sternberg-Lewerin
- Department of Biomedical Sciences and Veterinary Public Health, Faculty of Veterinary Medicine and Animal Science, Swedish University of Agricultural Sciences (SLU), SE-750 07 Uppsala, Sweden;
- Correspondence: ; Tel.: +46-18673192
| | - Erik Ågren
- Department of Pathology and Wildlife Diseases, National Veterinary Institute (SVA), SE-751 89 Uppsala, Sweden;
| | - Karl Ståhl
- Department of Disease Control and Epidemiology, National Veterinary Institute (SVA), SE-751 89 Uppsala, Sweden; (K.S.); (C.H.)
| | - Cecilia Hultén
- Department of Disease Control and Epidemiology, National Veterinary Institute (SVA), SE-751 89 Uppsala, Sweden; (K.S.); (C.H.)
| |
Collapse
|
8
|
Vaz-Rodrigues R, Ferreras-Colino E, Ugarte-Ruíz M, Pesciaroli M, Thomas J, García-Seco T, Sevilla IA, Pérez-Sancho M, Mateo R, Domínguez L, Gortazar C, Risalde MA. Nonspecific protection of heat-inactivated Mycobacterium bovis against Salmonella Choleraesuis infection in pigs. Vet Res 2022; 53:31. [PMID: 35436975 PMCID: PMC9014587 DOI: 10.1186/s13567-022-01047-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 03/17/2022] [Indexed: 11/10/2022] Open
Abstract
AbstractTrained immunity is the capacity of innate immune cells to produce an improved response against a secondary infection after a previous unrelated infection. Salmonellosis represents a public health issue and affects the pig farming industry. In general, vaccination against salmonellosis is still facing problems regarding the control of distinct serovars. Therefore, we hypothesized that an immunostimulant based on heat inactivated Mycobacterium bovis (HIMB) could have an immune training effect in pigs challenged with Salmonella enterica serovar Choleraesuis (S. Choleraesuis) and decided to explore the amplitude of this non-specific immune response. For this purpose, twenty-four 10 days-old female piglets were randomly separated in three groups: immunized group (n = 10) received orally two doses of HIMB prior to the intratracheal S. Choleraesuis-challenge, positive control group (n = 9) that was only challenged with S. Choleraesuis, and negative control group (n = 5) that was neither immunized nor infected. All individuals were necropsied 21 days post-challenge. HIMB improved weight gain and reduced respiratory symptoms and pulmonary lesions caused by S. Choleraesuis in pigs. Pigs immunized with HIMB showed higher cytokine production, especially of serum TNFα and lung CCL28, an important mediator of mucosal trained immunity. Moreover, immunized pigs showed lower levels of the biomarker of lipid oxidation malondialdehyde and higher activity of the antioxidant enzyme superoxide dismutase than untreated challenged pigs. However, the excretion and tissue colonization of S. Choleraesuis remained unaffected. This proof-of-concept study suggests beneficial clinical, pathological, and heterologous immunological effects against bacterial pathogens within the concept of trained immunity, opening avenues for further research.
Collapse
|
9
|
Papić B, Kušar D, Mićunović J, Vidrih Š, Pirš M, Ocepek M, Avberšek J. Genomic insights into Salmonella Choleraesuis var. Kunzendorf outbreak reveal possible interspecies transmission. Vet Microbiol 2021; 263:109282. [PMID: 34785475 DOI: 10.1016/j.vetmic.2021.109282] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 11/08/2021] [Accepted: 11/10/2021] [Indexed: 10/19/2022]
Abstract
Salmonella enterica serovar Choleraesuis is a host-adapted serovar that causes serious infections in domestic pigs and wild boars. Here, we investigated an outbreak of salmonellosis in domestic pigs in Slovenia, 2018-2019. To assess the outbreak, 18 isolates from domestic pigs, wild boars, wild boar meat and a human patient underwent whole-genome sequencing (WGS). All isolates were of sequence type (ST) 145 and harbored no antimicrobial resistance genes or AMR-associated mutations. A single transmission cluster (≤ 6 alleles) of spatially (< 100 km) and temporally linked isolates was observed, comprising isolates of pig (n = 9), wild boar (n = 2) and human (n = 1) origin, and suggesting possible interspecies transmission. In all outbreak-related animal cases, septicemic salmonellosis was observed, accompanied in some cases by enteric symptoms. All pig isolates were linked to a single intensive breeding farm that distributed growers to small family farms. The same transport vehicles were used to distribute growers to family farms and also to transport livestock between neighboring countries. Both isolates that originated from the imported wild boar meat were genetically distant (≥ 122 alleles) from the outbreak cluster. The present results indicate the importance of screening domestic pigs and proper disinfection of transport vehicles to control the spread of S. Choleraesuis.
Collapse
Affiliation(s)
- Bojan Papić
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Gerbičeva 60, SI-1000 Ljubljana, Slovenia.
| | - Darja Kušar
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Gerbičeva 60, SI-1000 Ljubljana, Slovenia
| | - Jasna Mićunović
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Gerbičeva 60, SI-1000 Ljubljana, Slovenia
| | - Špela Vidrih
- University of Ljubljana, Veterinary Faculty, National Veterinary Institute, Gerbičeva 60, SI-1000 Ljubljana, Slovenia
| | - Mateja Pirš
- University of Ljubljana, Faculty of Medicine, Institute of Microbiology and Immunology, Zaloška 4, SI-1000 Ljubljana, Slovenia
| | - Matjaž Ocepek
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Gerbičeva 60, SI-1000 Ljubljana, Slovenia
| | - Jana Avberšek
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Gerbičeva 60, SI-1000 Ljubljana, Slovenia
| |
Collapse
|
10
|
Uelze L, Bloch A, Borowiak M, Grobbel M, Deneke C, Fischer M, Malorny B, Pietsch M, Simon S, Szabó I, Tausch SH, Fischer J. What WGS Reveals about Salmonella enterica subsp. enterica in Wildlife in Germany. Microorganisms 2021; 9:1911. [PMID: 34576806 PMCID: PMC8471515 DOI: 10.3390/microorganisms9091911] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 08/26/2021] [Accepted: 09/06/2021] [Indexed: 11/28/2022] Open
Abstract
The aim of this study was to gain an overview of the genetic diversity of Salmonella found in wildlife in Germany. We were particularly interested in exploring whether wildlife acts as a reservoir of certain serovars/subtypes or antimicrobial resistance (AMR) genes. Moreover, we wanted to explore the potential of Salmonella in spreading from wildlife to livestock and humans. To answer these questions, we sequenced 260 Salmonella enterica subsp. enterica isolates sampled between 2002 and 2020 from wildlife across Germany, using short-read whole genome sequencing. We found, consistent with previous findings, that some Salmonella sequence types are associated with certain animal species, such as S. Choleraesuis ST145 with wild boar and S. Enteritidis ST183 with hedgehogs. Antibiotic resistance was detected in 14.2% of all isolates, with resistance against important WATCH group antibiotics present in a small number of isolates. We further found that wildlife isolates do not form separate phylogenetic clusters distant to isolates from domestic animals and foodstuff, thus indicating frequent transmission events between these reservoirs. Overall, our study shows that Salmonella in German wildlife are diverse, with a low AMR burden and close links to Salmonella populations of farm and food-production environments.
Collapse
Affiliation(s)
- Laura Uelze
- Department of Biological Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589 Berlin, Germany; (L.U.); (A.B.); (M.B.); (M.G.); (C.D.); (M.F.); (B.M.); (I.S.); (S.H.T.)
| | - Angelina Bloch
- Department of Biological Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589 Berlin, Germany; (L.U.); (A.B.); (M.B.); (M.G.); (C.D.); (M.F.); (B.M.); (I.S.); (S.H.T.)
| | - Maria Borowiak
- Department of Biological Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589 Berlin, Germany; (L.U.); (A.B.); (M.B.); (M.G.); (C.D.); (M.F.); (B.M.); (I.S.); (S.H.T.)
| | - Mirjam Grobbel
- Department of Biological Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589 Berlin, Germany; (L.U.); (A.B.); (M.B.); (M.G.); (C.D.); (M.F.); (B.M.); (I.S.); (S.H.T.)
| | - Carlus Deneke
- Department of Biological Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589 Berlin, Germany; (L.U.); (A.B.); (M.B.); (M.G.); (C.D.); (M.F.); (B.M.); (I.S.); (S.H.T.)
| | - Matthias Fischer
- Department of Biological Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589 Berlin, Germany; (L.U.); (A.B.); (M.B.); (M.G.); (C.D.); (M.F.); (B.M.); (I.S.); (S.H.T.)
| | - Burkhard Malorny
- Department of Biological Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589 Berlin, Germany; (L.U.); (A.B.); (M.B.); (M.G.); (C.D.); (M.F.); (B.M.); (I.S.); (S.H.T.)
| | - Michael Pietsch
- Unit for Enteropathogenic Bacteria and Legionella (FG11)/National Reference Centre for Salmonella and Other Bacterial Enteric Pathogens, Robert Koch Institute (RKI), Burgstr. 37, 38855 Wernigerode, Germany; (M.P.); (S.S.)
| | - Sandra Simon
- Unit for Enteropathogenic Bacteria and Legionella (FG11)/National Reference Centre for Salmonella and Other Bacterial Enteric Pathogens, Robert Koch Institute (RKI), Burgstr. 37, 38855 Wernigerode, Germany; (M.P.); (S.S.)
| | - István Szabó
- Department of Biological Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589 Berlin, Germany; (L.U.); (A.B.); (M.B.); (M.G.); (C.D.); (M.F.); (B.M.); (I.S.); (S.H.T.)
| | - Simon H. Tausch
- Department of Biological Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589 Berlin, Germany; (L.U.); (A.B.); (M.B.); (M.G.); (C.D.); (M.F.); (B.M.); (I.S.); (S.H.T.)
| | - Jennie Fischer
- Department of Biological Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589 Berlin, Germany; (L.U.); (A.B.); (M.B.); (M.G.); (C.D.); (M.F.); (B.M.); (I.S.); (S.H.T.)
| |
Collapse
|
11
|
Meneguzzi M, Pissetti C, Rebelatto R, Trachsel J, Kuchiishi SS, Reis AT, Guedes RMC, Leão JA, Reichen C, Kich JD. Re-Emergence of Salmonellosis in Hog Farms: Outbreak and Bacteriological Characterization. Microorganisms 2021; 9:947. [PMID: 33925758 PMCID: PMC8146755 DOI: 10.3390/microorganisms9050947] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 04/23/2021] [Accepted: 04/25/2021] [Indexed: 11/17/2022] Open
Abstract
Clinical salmonellosis has been increasing significantly in Brazil in recent years. A total of 130 outbreaks distributed among 10 swine-producing states were investigated. One representative Salmonella isolate from each outbreak was characterized through serotyping, antimicrobial resistance profiles, PFGE, and WGS. From 130 outbreaks: 50 were enteric, 48 were septicemic, 17 cases were characterized as hepato-biliary invasive, 13 as nodal and two were not classified. The most prevalent serovars were a monophasic variant of S. typhimurium (55/130), Choleraesuis (46/130), and Typhimurium (14/130). Most of the strains (86.92%) demonstrated a high rate of multi-drug resistance. The identification of a major Choleraesuis clonal group in several Brazilian states sharing the same resistance genes suggested that these strains were closely related. Six strains from this clonal group were sequenced, revealing the same ST-145 and 11 to 47 different SNPs. The detected plasmid type showed multiple marker genes as RepA_1_pKPC-CAV1321, the first to be reported in Salmonella. All AMR genes detected in the genomes were likely present on plasmids, and their phenotype was related to genotypic resistance genes. These findings reveal that salmonellosis is endemic in the most important pig-producing states in Brazil, emphasizing the need to make data available to aid in reducing its occurrence.
Collapse
Affiliation(s)
- Mariana Meneguzzi
- Curso de Medicina Veterinária, Instituto Federal Catarinense, Concórdia 89703-720, SC, Brazil; (M.M.); (C.R.)
| | - Caroline Pissetti
- Departamento de Medicina Veterinária Preventiva, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre 91540-000, RS, Brazil;
| | - Raquel Rebelatto
- Embrapa Suínos e Aves, Empresa Brasileira de Pesquisa Agropecuária, Concórdia 89715-899, SC, Brazil;
| | - Julian Trachsel
- National Animal Disease Center, Food Safety and Enteric Pathogens, Ames, IA 50010, USA;
| | | | - Adrienny Trindade Reis
- Centro de Diagnóstico e Monitoramento Animal, CDMA, Belo Horizonte 30411-191, MG, Brazil;
| | - Roberto Maurício Carvalho Guedes
- Departamento de Clínica e Cirurgia Veterinária, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, MG, Brazil;
| | | | - Caroline Reichen
- Curso de Medicina Veterinária, Instituto Federal Catarinense, Concórdia 89703-720, SC, Brazil; (M.M.); (C.R.)
| | - Jalusa Deon Kich
- Embrapa Suínos e Aves, Empresa Brasileira de Pesquisa Agropecuária, Concórdia 89715-899, SC, Brazil;
| |
Collapse
|
12
|
Xu F, Ge C, Li S, Tang S, Wu X, Luo H, Deng X, Zhang G, Stevenson A, Baker RC. Evaluation of nanopore sequencing technology to identify Salmonella enterica Choleraesuis var. Kunzendorf and Orion var. 15 +, 34 . Int J Food Microbiol 2021; 346:109167. [PMID: 33774575 DOI: 10.1016/j.ijfoodmicro.2021.109167] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 03/04/2021] [Accepted: 03/08/2021] [Indexed: 02/06/2023]
Abstract
Our previous study demonstrated that whole genome sequencing (WGS) data generated by Oxford Nanopore Technologies (ONT) can be used for rapid and accurate prediction of selected Salmonella serotypes. However, one limitation is that established methods for WGS-based serotype prediction, utilizing data from either ONT or Illumina, cannot differentiate certain serotypes and serotype variants with the same or closely related antigenic formulae. This study aimed to evaluate nanopore sequencing and additional data analysis for identification of Salmonella enterica Choleraesuis var. Kunzendorf and S. enterica Orion var. 15+, 34+, thus overcoming this limitation. Five workflows that combined different flow cells, library construction methods and basecaller models were evaluated and compared. The workflow that consisted of the R9 flow cell, rapid sequencing library construction kit and guppy basecaller with base modified model performed best for Single Nucleotide Polymorphism (SNP) analysis. With this workflow, 99.98% of matching identity between assembled genomes from ONT and that from Illumina was achieved. Less than five high-quality SNPs differed when comparing sequencing data between ONT and Illumina. SNP typing successfully identified Choleraesuis var. Kunzendorf. While prophage prediction further differentiated Orion var. 15+, 34+ from the other two Orion variants. Our study improves the readiness of ONT as a Salmonella subtyping and source tracking tool for food industry applications.
Collapse
Affiliation(s)
- Feng Xu
- Mars Global Food Safety Center, Beijing 101407, China.
| | - Chongtao Ge
- Mars Global Food Safety Center, Beijing 101407, China.
| | - Shaoting Li
- Center for Food Safety, University of Georgia, Griffin, GA 30223, USA
| | - Silin Tang
- Mars Global Food Safety Center, Beijing 101407, China
| | - Xingwen Wu
- Mars Global Food Safety Center, Beijing 101407, China
| | - Hao Luo
- Mars Global Food Safety Center, Beijing 101407, China
| | - Xiangyu Deng
- Center for Food Safety, University of Georgia, Griffin, GA 30223, USA
| | | | | | | |
Collapse
|
13
|
Uelze L, Becker N, Borowiak M, Busch U, Dangel A, Deneke C, Fischer J, Flieger A, Hepner S, Huber I, Methner U, Linde J, Pietsch M, Simon S, Sing A, Tausch SH, Szabo I, Malorny B. Toward an Integrated Genome-Based Surveillance of Salmonella enterica in Germany. Front Microbiol 2021; 12:626941. [PMID: 33643254 PMCID: PMC7902525 DOI: 10.3389/fmicb.2021.626941] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Accepted: 01/21/2021] [Indexed: 02/03/2023] Open
Abstract
Despite extensive monitoring programs and preventative measures, Salmonella spp. continue to cause tens of thousands human infections per year, as well as many regional and international food-borne outbreaks, that are of great importance for public health and cause significant socio-economic costs. In Germany, salmonellosis is the second most common cause of bacterial diarrhea in humans and is associated with high hospitalization rates. Whole-genome sequencing (WGS) combined with data analysis is a high throughput technology with an unprecedented discriminatory power, which is particularly well suited for targeted pathogen monitoring, rapid cluster detection and assignment of possible infection sources. However, an effective implementation of WGS methods for large-scale microbial pathogen detection and surveillance has been hampered by the lack of standardized methods, uniform quality criteria and strategies for data sharing, all of which are essential for a successful interpretation of sequencing data from different sources. To overcome these challenges, the national GenoSalmSurv project aims to establish a working model for an integrated genome-based surveillance system of Salmonella spp. in Germany, based on a decentralized data analysis. Backbone of the model is the harmonization of laboratory procedures and sequencing protocols, the implementation of open-source bioinformatics tools for data analysis at each institution and the establishment of routine practices for cross-sectoral data sharing for a uniform result interpretation. With this model, we present a working solution for cross-sector interpretation of sequencing data from different sources (such as human, veterinarian, food, feed and environmental) and outline how a decentralized data analysis can contribute to a uniform cluster detection and facilitate outbreak investigations.
Collapse
Affiliation(s)
- Laura Uelze
- Department of Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Natalie Becker
- Department of Food, Feed and Commodities, Federal Office of Consumer Protection and Food Safety, Berlin, Germany
| | - Maria Borowiak
- Department of Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Ulrich Busch
- Bavarian Health and Food Safety Authority, Oberschleißheim, Germany
| | - Alexandra Dangel
- Bavarian Health and Food Safety Authority, Oberschleißheim, Germany
| | - Carlus Deneke
- Department of Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Jennie Fischer
- Department of Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Antje Flieger
- Unit of Enteropathogenic Bacteria and Legionella (FG11) – National Reference Centre for Salmonella and Other Bacterial Enteric Pathogens, Robert Koch Institute, Wernigerode, Germany
| | - Sabrina Hepner
- Bavarian Health and Food Safety Authority, Oberschleißheim, Germany
| | - Ingrid Huber
- Bavarian Health and Food Safety Authority, Oberschleißheim, Germany
| | - Ulrich Methner
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena, Germany
| | - Jörg Linde
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena, Germany
| | - Michael Pietsch
- Unit of Enteropathogenic Bacteria and Legionella (FG11) – National Reference Centre for Salmonella and Other Bacterial Enteric Pathogens, Robert Koch Institute, Wernigerode, Germany
| | - Sandra Simon
- Unit of Enteropathogenic Bacteria and Legionella (FG11) – National Reference Centre for Salmonella and Other Bacterial Enteric Pathogens, Robert Koch Institute, Wernigerode, Germany
| | - Andreas Sing
- Bavarian Health and Food Safety Authority, Oberschleißheim, Germany
| | - Simon H. Tausch
- Department of Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Istvan Szabo
- Department of Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Burkhard Malorny
- Department of Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| |
Collapse
|
14
|
Spread of Antimicrobial Resistance by Salmonella enterica Serovar Choleraesuis between Close Domestic and Wild Environments. Antibiotics (Basel) 2020; 9:antibiotics9110750. [PMID: 33137987 PMCID: PMC7692705 DOI: 10.3390/antibiotics9110750] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 10/27/2020] [Accepted: 10/28/2020] [Indexed: 11/17/2022] Open
Abstract
The Salmonellaenterica serovar Choleraesuis affects domestic pig and wild boar (WB), causing clinical salmonellosis. Iberian swine production is based on a free-range production system where WB and Iberian pig (IP) share ecosystems. This study focuses on the negative impact on the pork industry of infections due to this serotype, its role in the spread of antibiotic resistance, and its zoonotic potential. Antibiotic resistance (AR) and genetic relationships were analyzed among 20 strains of S. Choleraesuis isolated from diseased WB and IP sampled in the southwest region of the Iberian Peninsula. AR was studied using the Kirby-Bauer method with the exception of colistin resistance, which was measured using the broth microdilution reference method. Resistance and Class 1 integrase genes were measured using PCR, and the genetic relationship between isolates and plasmid content by pulsed field gel electrophoresis. The results show a higher incidence of AR in isolates from IP. Phylogenetic analysis revealed seven profiles with two groups containing isolates from IP and WB, which indicates circulation of the same clone between species. Most pulsotypes presented with one plasmid of the same size, indicating vertical transmission. AR determinants blaTEM and tetA were routinely found in IP and WB, respectively. One isolate from IP expressed colistin resistance and presented the mcr-1 gene carried by a plasmid. This study suggests that S. Choleraesuis circulates between WB and IP living in proximity, and also that the mobilization of AR genes by plasmids is low. Furthermore, the detection of plasmid-mediated colistin resistance in bacteria from IP is alarming and should be monitored.
Collapse
|
15
|
Torres RT, Fernandes J, Carvalho J, Cunha MV, Caetano T, Mendo S, Serrano E, Fonseca C. Wild boar as a reservoir of antimicrobial resistance. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 717:135001. [PMID: 31839282 DOI: 10.1016/j.scitotenv.2019.135001] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 09/19/2019] [Accepted: 10/14/2019] [Indexed: 06/10/2023]
Abstract
Antimicrobial resistance (AMR) has been recognized as an emerging and growing problem worldwide. Knowledge concerning AMR bacteria circulating in wildlife is currently limited, although it could provide important insights into AMR emergence and persistence. Across Europe, wild boar (Sus scrofa) populations have dramatically increased their distribution and number over the last decades. In the context of AMR dynamics, wild boar is a perfect model species to unveil the emergence, spread and persistence of AMR at the human-livestock-wildlife interface. Here, we summarize the current knowledge on the importance of wild boar as a reservoir of antimicrobial resistant bacteria, and its possible use as sentinel species for surveillance. Analyses of available data showed a rising interest on this topic in the last years, highlighting the growing concern on wild boar potential role as AMR facilitator and it is foreseen that the importance of antimicrobial resistance research in wild boar will continue to increase in years to come. Available studieshave been focused on specific bacterial species, particularlyE. coli, Salmonellaspp. andEnterococcusspp., bioindicators of AMR, and have been mainly conducted in three countries: Spain, Portugal and Germany.Strikingly, AMR surveillance in wild boar is uneven and still poorly allocated as many wild boar high-density countries do not yet have publications on the topic.Overall, accumulated data showed thatwild boar are carriers of antimicrobial resistant bacteria, withvariation in the prevalence of bacterial species and thepercentage of resistance to different antibiotics. Thelack of harmonized sampling and testing protocols makes it difficult to compare AMR in wild boar.The need for the establishment of standardised protocols keen to provide quantitative comparable data is highlighted. We finally suggest the long-term monitoring of wild boar as a sentinel species for AMR surveillance in order to inform public policies on this topic.
Collapse
Affiliation(s)
| | - Joana Fernandes
- Department of Biology & CESAM, University of Aveiro, Portugal
| | - João Carvalho
- Department of Biology & CESAM, University of Aveiro, Portugal
| | - Mónica V Cunha
- National Institute for Agrarian and Veterinary Research (INIAV, IP), Av. da República, Quinta do Marquês, 2780-157 Oeiras, Portugal; Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal; Biosystems & Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal
| | - Tânia Caetano
- Department of Biology & CESAM, University of Aveiro, Portugal
| | - Sónia Mendo
- Department of Biology & CESAM, University of Aveiro, Portugal
| | - Emmanuel Serrano
- Wildlife Ecology & Health group (WE&H), and Servei d'Ecopatologia de Fauna Salvatge (SEFaS), Departament de Medicina i Cirurgia Animals, Facultat de Veterinària, Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain; Dipartimento di Scienze Veterinarie, Universitá di Torino, Grugliasco, Torino, Italy
| | - Carlos Fonseca
- Department of Biology & CESAM, University of Aveiro, Portugal
| |
Collapse
|