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Pérez-Pérez L, Carvajal A, Puente H, Peres Rubio C, Cerón JJ, Rubio P, Argüello H. New insights into swine dysentery: faecal shedding, macro and microscopic lesions and biomarkers in early and acute stages of Brachyspira hyodysenteriae infection. Porcine Health Manag 2024; 10:24. [PMID: 38951921 PMCID: PMC11218200 DOI: 10.1186/s40813-024-00375-9] [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: 04/19/2024] [Accepted: 06/20/2024] [Indexed: 07/03/2024] Open
Abstract
BACKGROUND Swine dysentery (SD) is a severe mucohaemorrhagic colitis in pigs caused classically by Brachyspira hyodysenteriae. Although several aspects of B. hyodysenteriae infection dynamic are already described, further research in the early stage of this infection is required. In this study, 7-week-old pigs were orally challenged with B. hyodysenteriae to obtain information about faecal shedding, macro and microscopic intestinal lesions and serum acute phase proteins in pigs at the onset of B. hyodysenteriae shedding (early infection group, n = 8), in pigs with mucohaemorrhagic diarrhoea (acute infection group, n = 8) and in non-infected controls (n = 16). RESULTS First B. hyodysenteriae detection by q-PCR and first loose stools with blood and mucus occurred both at 8 days post-inoculation. The lapse between a positive q-PCR and observation of mucohaemorrhagic diarrhoea ranged from 0 to 3 days, except in a single pig in which this period lasted 5 days. Macroscopic lesions were observed in the large intestine from both infected groups although more frequent and severe in acute infection group. Microscopic observation of the apex mucosa revealed that in early infection only higher ulceration values were observed compared to healthy controls. In contrast, the acute infection group exhibited higher ulceration, neutrophils infiltration and increased mucosal thickness compared to the other two groups. Among the serum biomarkers tested, only haptoglobin, C-reactive protein, and creatine kinase showed a significant increase in pigs in the acute infection period compared to controls, whereas haptoglobin was the only factor with a significant increase at the early infection compared to non-infected animals. CONCLUSIONS This study provides new insights about SD and remarks the complex and limited options to perform an early detection of infected animals beyond PCR diagnosis.
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Affiliation(s)
- Lucía Pérez-Pérez
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, León, Spain
| | - Ana Carvajal
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, León, Spain.
- INDEGSAL, Universidad de León, León, Spain.
| | - Héctor Puente
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, León, Spain
| | - Camila Peres Rubio
- Interdisciplinary Laboratory of Clinical Analysis (Interlab-UMU), Campus de Excelencia Internacional Mare Nostrum, Universidad de Murcia, Murcia, Spain
| | - Jose Joaquín Cerón
- Interdisciplinary Laboratory of Clinical Analysis (Interlab-UMU), Campus de Excelencia Internacional Mare Nostrum, Universidad de Murcia, Murcia, Spain
| | - Pedro Rubio
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, León, Spain
- INDEGSAL, Universidad de León, León, Spain
| | - Héctor Argüello
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, León, Spain
- INDEGSAL, Universidad de León, León, Spain
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Gothe J, Pfetzing S, Ulrich R, Schrödl W, Baums CG, Heilmann RM. Brachyspira in dogs: risk factors of shedding in central Germany and longitudinal study of an infected kennel. BMC Vet Res 2024; 20:136. [PMID: 38575983 PMCID: PMC10993570 DOI: 10.1186/s12917-024-03989-x] [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: 05/02/2023] [Accepted: 03/25/2024] [Indexed: 04/06/2024] Open
Abstract
BACKGROUND Brachyspira (B.) pilosicoli is a zoonotic pathogen, able to infect different animal species such as pigs, poultry, and rodents, causing intestinal spirochetosis. An association of gastrointestinal clinical signs, such as diarrhea, with the isolation of B. pilosicoli from fecal samples or rectal swabs has not been proven in dogs. Other Brachyspira species commonly isolated from dogs, such as "B. canis" and "B. pulli", are considered commensals. This study investigated the occurrence of different Brachyspira species in rectal swabs and fecal samples in an independent canine cohort in central Germany. These included samples from shelter dogs, hunting dogs, and dogs presenting at regional small animal practices with various clinical signs. Data about the dogs, including potential risk factors for Brachyspira isolation, were obtained using a standardized questionnaire. The study also longitudinally investigated a colony of Beagle dogs for Brachyspira over 5 years. RESULTS The rate of Brachyspira spp. isolation was 11% and included different Brachyspira species ("B. canis", "B. pulli", and B. pilosicoli). "B. canis" was detected in 18 dogs, whereas B. pilosicoli was only isolated from 1 dog in the independent cohort (not including the Beagle colony). Risk factors for shedding Brachyspira and "B. canis" were being less than 1 year of age and shelter origin. Gastrointestinal signs were not associated with the shedding of Brachyspira. B. pilosicoli and "B. canis" were isolated from several dogs of the same Beagle colony in 2017 and again in 2022, while Brachyspira was not isolated at multiple sampling time points in 2021. CONCLUSIONS Shedding of B. pilosicoli in dogs appears to be uncommon in central Germany, suggesting a low risk of zoonotic transmission from dogs. Commensal status of "B. canis" and "B. pulli" is supported by the results of this study. Findings from the longitudinal investigation of the Beagle colony agree with an asymptomatic long-term colonization of dogs with "B. canis" and B. pilosicoli and suggest that introducing new animals in a pack can trigger an increased shedding of B. pilosicoli.
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Affiliation(s)
- Julia Gothe
- Institute of Bacteriology and Mycology, Centre for Infectious Diseases, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Sarah Pfetzing
- Institute of Veterinary Pathology, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Reiner Ulrich
- Institute of Veterinary Pathology, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Wieland Schrödl
- Institute of Bacteriology and Mycology, Centre for Infectious Diseases, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Christoph G Baums
- Institute of Bacteriology and Mycology, Centre for Infectious Diseases, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany
| | - Romy M Heilmann
- Department for Small Animals, Veterinary Teaching Hospital, Faculty of Veterinary Medicine, University of Leipzig, An den Tierkliniken 23, 04103, Leipzig, Germany.
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Experimental Infection of Pigs with a ST 245 Brachyspira hyodysenteriae Isolated from an Asymptomatic Pig in a Herd with No History of Swine Dysentery. Vet Sci 2022; 9:vetsci9060286. [PMID: 35737338 PMCID: PMC9229277 DOI: 10.3390/vetsci9060286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 06/07/2022] [Accepted: 06/08/2022] [Indexed: 12/03/2022] Open
Abstract
Swine dysentery (SD) is characterized by a severe mucohemorrhagic colitis caused by infection with Brachyspira species. In infected herds the disease causes considerable financial loss due to mortality, slow growth rates, poor feed conversion, and costs of treatment. B. hyodysenteriae is the most common etiological agent of SD and infection is usually associated with disease. However, isolated reports have described low pathogenic strains of B. hyodysenteriae. The aim of this study was to describe an experimental infection trial using a subclinical B. hyodysenteriae isolated from an animal without clinical signs and from a disease-free herd, to evaluate the pathogenicity and clinical pathological characteristics compared to a highly clinical isolate. Forty-eight 5-week-old pigs were divided into three groups: control, clinical and the subclinical isolates. The first detection/isolation of B. hyodysenteriae in samples of the animals challenged with a known clinical B. hyodysenteriae strain (clinical group) occurred 5th day post inoculation. Considering the whole period of the study, 11/16 animals from this group were qPCR positive in fecal samples, and diarrhea was observed in 10/16 pigs. In the subclinical isolate group, one animal had diarrhea. There were SD large intestine lesions in 3 animals at necropsy and positive B. hyodysenteriae isolation in 7/15 samples of the subclinical group. In the control group, no diarrhea, gross/microscopic lesions, or qPCR positivity were observed. Clinical signs, bacterial isolation, macroscopic and histologic lesions were significantly difference among groups, demonstrating low pathogenicity of the subclinical isolate in susceptible pigs.
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Gómez-García M, Argüello H, Pérez-Pérez L, Vega C, Puente H, Mencía-Ares Ó, Rubio P, Carvajal A. Combined in-vitro and on-farm evaluation of commercial disinfectants used against Brachyspira hyodysenteriae. Porcine Health Manag 2022; 8:3. [PMID: 34998431 PMCID: PMC8742949 DOI: 10.1186/s40813-021-00244-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 12/16/2021] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Swine dysentery (SD) is a severe infectious disease with a relevant impact on pig production usually caused by Brachyspira hyodysenteriae, although B. hampsonii causes an identical clinical picture. SD control relies on antimicrobials, good management practices and strict biosecurity with cleaning and disinfection as crucial tools to avoid the pathogen transmission. This study evaluates the in-vitro efficacy of an array of commercial disinfectants against a collection of B. hyodysenteriae isolates using broth tests. The efficacy of cleaning and disinfection protocols was also evaluated on two farms with endemic SD using surface swabs collected in emptied pens before and after cleaning and disinfection procedures, using both real-time PCR and bacterial microbiological culture. RESULTS Most of the commercial disinfectants evaluated were effective against all B. hyodysenteriae isolates tested, with a reduction of more than 5.00 log10 CFU/mL (bactericidal efficacy of 99.999%). However, some isolates exhibited reduced susceptibility to Virkon-S and Limoseptic disinfectants. The evaluation of cleaning and disinfection protocols on farms with SD outbreaks showed that approximately half the pens tested (n = 25) were positive by real-time PCR after pigs removal (mean B. hyodysenteriae counts 5.72 ± 1.04 log10 CFU/mL) while almost 20% of the pens remained positive after cleaning (n = 7) and disinfection (n = 5) procedures although with significantly lower, mean estimates (4.31 ± 0.43 log10 CFU/mL and 4.01 ± 0.55 log10 CFU/mL, respectively). CONCLUSIONS These results show the efficacy of disinfectants against B. hyodysenteriae but also stress the need to implement adequately the cleaning and disinfection protocols on pig farms and review and revise their efficiency periodically.
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Affiliation(s)
- Manuel Gómez-García
- Department of Animal Health, Faculty of Veterinary Medicine, Universidad de León, León, Spain.
| | - Héctor Argüello
- Department of Animal Health, Faculty of Veterinary Medicine, Universidad de León, León, Spain
| | - Lucía Pérez-Pérez
- Department of Animal Health, Faculty of Veterinary Medicine, Universidad de León, León, Spain
| | - Clara Vega
- Department of Animal Health, Faculty of Veterinary Medicine, Universidad de León, León, Spain
| | - Héctor Puente
- Department of Animal Health, Faculty of Veterinary Medicine, Universidad de León, León, Spain
| | - Óscar Mencía-Ares
- Department of Animal Health, Faculty of Veterinary Medicine, Universidad de León, León, Spain
| | - Pedro Rubio
- Department of Animal Health, Faculty of Veterinary Medicine, Universidad de León, León, Spain
| | - Ana Carvajal
- Department of Animal Health, Faculty of Veterinary Medicine, Universidad de León, León, Spain
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Carranza A, Parada J, Tamiozzo P, León MF, Camacho P, Cola GD, Corona-Barrera E, Ambrogi A, Zielinski G. Identification and distribution of Brachyspira species in feces from finishing pigs in Argentina. Vet World 2021; 14:607-613. [PMID: 33935405 PMCID: PMC8076473 DOI: 10.14202/vetworld.2021.607-613] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 01/22/2021] [Indexed: 12/03/2022] Open
Abstract
Background and Aim: Brachyspira are Gram-negative, aerotolerant spirochetes that colonize the large intestine of various species of domestic animals and humans. The aim of this study was to determine the presence and distribution of different species of Brachyspira presents in feces from finishing pigs in Argentina. Materials and Methods: Fecal samples (n=1550) were collected from finishing pigs in 53 farms of the most important swine production areas of Argentina, and Brachyspiras species were identified by bacteriological and molecular methods. Results: The regional prevalence of Brachyspira spp. was at the level of 75.5% (confidence interval 95%, 62.9-87.9), and it was lower among those farms with >1001 sows. One hundred and twenty-eight isolates of Brachyspira were properly identified and the species found were: Brachyspira hyodysenteriae, Brachyspira pilosicoli, Brachyspira innocens, and Brachyspira murdochii. B. hyodysenteriae and B. pilosicoli had low prevalence (1.9% and 7.5%, respectively), B. innocens was isolated from 34% of the farms and B. murdochii was found in 39.6%. Conclusion: The present study provides epidemiological data about herd prevalence of the different Brachyspira species in Argentina, showing that the prevalence figure seems to be higher than that reported in other countries.
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Affiliation(s)
- Alicia Carranza
- Department of Animal Pathology, Faculty of Agronomy and Veterinary, National University of Rio Cuarto, Río Cuarto, Argentina
| | - Julián Parada
- Department of Animal Pathology, Faculty of Agronomy and Veterinary, National University of Rio Cuarto, Río Cuarto, Argentina.,National Scientific and Technical Research Council (CONICET), Córdoba, Argentina
| | - Pablo Tamiozzo
- Department of Animal Pathology, Faculty of Agronomy and Veterinary, National University of Rio Cuarto, Río Cuarto, Argentina
| | - Malena Flores León
- Department of Animal Pathology, Faculty of Agronomy and Veterinary, National University of Rio Cuarto, Río Cuarto, Argentina
| | - Pablo Camacho
- Department of Animal Pathology, Faculty of Agronomy and Veterinary, National University of Rio Cuarto, Río Cuarto, Argentina
| | - Gabriel Di Cola
- Department of Animal Pathology, Faculty of Agronomy and Veterinary, National University of Rio Cuarto, Río Cuarto, Argentina
| | - Enrique Corona-Barrera
- Faculty of Veterinary Medicine and Animal Science, Autonomous University of Tamaulipas, Victoria, México
| | - Arnaldo Ambrogi
- Department of Animal Pathology, Faculty of Agronomy and Veterinary, National University of Rio Cuarto, Río Cuarto, Argentina
| | - Gustavo Zielinski
- National Agricultural Technology Institute (INTA), Marcos Juárez, Córdoba, Argentina
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Joerling J, Willems H, Ewers C, Herbst W. Differential expression of hemolysin genes in weakly and strongly hemolytic Brachyspira hyodysenteriae strains. BMC Vet Res 2020; 16:169. [PMID: 32471432 PMCID: PMC7260840 DOI: 10.1186/s12917-020-02385-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 05/21/2020] [Indexed: 11/20/2022] Open
Abstract
Background Swine dysentery (SD) is a diarrheal disease in fattening pigs that is caused by the strongly hemolytic species Brachyspira (B.) hyodysenteriae, B. hampsonii and B. suanatina. As weakly hemolytic Brachyspira spp. are considered less virulent or even non-pathogenic, the hemolysin is regarded as an important factor in the pathogenesis of SD. Four hemolysin genes (tlyA, tlyB, tlyC, and hlyA) and four putative hemolysin genes (hemolysin, hemolysin activation protein, hemolysin III, and hemolysin channel protein) have been reported, but their role in strong hemolysis is not entirely clear. Our study aimed to assess the transcriptional activity of eight (putative) hemolysin genes in a strongly hemolytic (B204) and a weakly hemolytic (G423) B. hyodysenteriae strain during non-hemolytic and hemolytic growth stages. Results Strongly and weakly hemolytic B. hyodysenteriae strains caused hemolysis on blood agar at different growth stages, namely during log phase (B204) and stationary/death phase (G423). During the lag, early log, late log (stationary phase in G423) and death phase (time points 1–4) strains differed in their hemolysin gene transcription patterns. At time point 1, transcription of the putative hemolysin gene was higher in B204 than in G423. At time point 2, tlyA and tlyC were upregulated in B204 during hemolysis. TlyB and hlyA were upregulated in both strains at all time points, but higher transcription rates were observed in the weakly hemolytic strain G423. The transcription activity of the hemolysin channel protein gene was quite similar in both strains, whereas the hemolysin activation protein gene was upregulated in the non-hemolytic stage of B204 at time point 4. Sequence analysis revealed deletions, insertions and single nucleotide polymorphisms in the G423 hlyA promoter, although without altering the transcription activity of this gene. Conclusion Our data indicate a combined activity of TlyA and TlyC as the most probable underlying mechanism of strong hemolysis in B. hyodysenteriae. Further studies should verify if the expression of tlyA is upregulated by the putative hemolysin gene. Depending on their immunogenic potential TlyA and TlyC may serve as possible vaccine candidates, especially since vaccines for an effective control of swine dysentery are currently not available.
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Affiliation(s)
- Jessica Joerling
- Institute of Hygiene and Infectious Diseases of Animals, Justus Liebig University Giessen, Frankfurter Str. 85-89, 35392, Giessen, Germany
| | - Hermann Willems
- Department of Veterinary Clinical Sciences, Clinic for Swine, Justus Liebig University Giessen, Frankfurter Str. 112, 35392, Giessen, Germany
| | - Christa Ewers
- Institute of Hygiene and Infectious Diseases of Animals, Justus Liebig University Giessen, Frankfurter Str. 85-89, 35392, Giessen, Germany.
| | - Werner Herbst
- Institute of Hygiene and Infectious Diseases of Animals, Justus Liebig University Giessen, Frankfurter Str. 85-89, 35392, Giessen, Germany
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Rohde J, Majzoub-Altweck M, Falkenau A, Hermanns W, Burrough ER, Ritzmann M, Stadler J. Occurrence of dysentery-like diarrhoea associated with Brachyspira suanatina
infection on a German fattening pig farm. Vet Rec 2018; 182:195. [DOI: 10.1136/vr.104705] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 11/24/2017] [Accepted: 12/24/2017] [Indexed: 11/04/2022]
Affiliation(s)
- Judith Rohde
- Institute for Microbiology, University of Veterinary Medicine, Foundation; Hannover Germany
| | - Monir Majzoub-Altweck
- Institute of Veterinary Pathology, Centre for Clinical Veterinary Medicine, Ludwig-Maximilians-University Munich; Munich Germany
| | - Almuth Falkenau
- Institute of Veterinary Pathology, Centre for Clinical Veterinary Medicine, Ludwig-Maximilians-University Munich; Munich Germany
| | - Walter Hermanns
- Institute of Veterinary Pathology, Centre for Clinical Veterinary Medicine, Ludwig-Maximilians-University Munich; Munich Germany
| | - Eric R Burrough
- Department of Veterinary Diagnostic and Production Animal Medicine; College of Veterinary Medicine, Iowa State University; Ames USA
| | - Mathias Ritzmann
- Clinic for Swine, Centre for Clinical Veterinary Medicine, Ludwig-Maximilians-University Munich; Oberschleissheim Germany
| | - Julia Stadler
- Clinic for Swine, Centre for Clinical Veterinary Medicine, Ludwig-Maximilians-University Munich; Oberschleissheim Germany
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Zeeh F, De Luca S, Nicholson P, Grützner N, Nathues C, Perreten V, Nathues H. Brachyspira hyodysenteriae detection in the large intestine of slaughtered pigs. J Vet Diagn Invest 2017; 30:56-63. [PMID: 28906177 DOI: 10.1177/1040638717722816] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Detection of subclinical Brachyspira hyodysenteriae infection in pig herds using feces is challenging. However, the ability to detect the pathogen in intestinal samples of slaughtered pigs has not been investigated, to our knowledge. Therefore, we determined the detection of B. hyodysenteriae in the colon, cecum, and rectum from slaughtered pigs. We analyzed the correlation between detection rates and intestinal lesions, ingesta or fecal consistency, and time from sample collection until processing. A total of 400 ingesta-mucosal (colon, cecum) and 200 fecal (rectum) samples from 200 pigs originating from 20 different herds were bacteriologically examined using selective culture followed by Brachyspira spp. identification by PCR and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Ingesta or fecal consistency and intestinal lesions were scored. Brachyspira hyodysenteriae was detected in 23 samples from 16 intestines originating from 7 herds. Brachyspira spp. were detected in 96 samples. More intestinal (16) than fecal (7) samples tested positive for B. hyodysenteriae. For Brachyspira spp., this difference was significant (69 vs. 27; p < 0.01). In particular, colon samples tested positive ( n = 42, p = 0.06). Most (91%) of the intestines showed no lesions typical for clinical B. hyodysenteriae infection, and median ingesta or fecal consistency was "soft and formed," indicating subclinical infection, colonization, or absence of infection. Ingesta from slaughtered pigs, in particular from the colon and sites with lesions, is useful material for detection of B. hyodysenteriae.
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Affiliation(s)
- Friederike Zeeh
- Clinic for Swine (Zeeh, Grützner, H Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Institute of Veterinary Bacteriology (Perreten, Nicholson), Vetsuisse Faculty, University of Bern, Switzerland.,Veterinary Public Health Institute (C Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Faculty of Veterinary Medicine, University of Perugia, Perugia, Italy (De Luca)
| | - Silvio De Luca
- Clinic for Swine (Zeeh, Grützner, H Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Institute of Veterinary Bacteriology (Perreten, Nicholson), Vetsuisse Faculty, University of Bern, Switzerland.,Veterinary Public Health Institute (C Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Faculty of Veterinary Medicine, University of Perugia, Perugia, Italy (De Luca)
| | - Pamela Nicholson
- Clinic for Swine (Zeeh, Grützner, H Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Institute of Veterinary Bacteriology (Perreten, Nicholson), Vetsuisse Faculty, University of Bern, Switzerland.,Veterinary Public Health Institute (C Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Faculty of Veterinary Medicine, University of Perugia, Perugia, Italy (De Luca)
| | - Niels Grützner
- Clinic for Swine (Zeeh, Grützner, H Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Institute of Veterinary Bacteriology (Perreten, Nicholson), Vetsuisse Faculty, University of Bern, Switzerland.,Veterinary Public Health Institute (C Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Faculty of Veterinary Medicine, University of Perugia, Perugia, Italy (De Luca)
| | - Christina Nathues
- Clinic for Swine (Zeeh, Grützner, H Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Institute of Veterinary Bacteriology (Perreten, Nicholson), Vetsuisse Faculty, University of Bern, Switzerland.,Veterinary Public Health Institute (C Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Faculty of Veterinary Medicine, University of Perugia, Perugia, Italy (De Luca)
| | - Vincent Perreten
- Clinic for Swine (Zeeh, Grützner, H Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Institute of Veterinary Bacteriology (Perreten, Nicholson), Vetsuisse Faculty, University of Bern, Switzerland.,Veterinary Public Health Institute (C Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Faculty of Veterinary Medicine, University of Perugia, Perugia, Italy (De Luca)
| | - Heiko Nathues
- Clinic for Swine (Zeeh, Grützner, H Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Institute of Veterinary Bacteriology (Perreten, Nicholson), Vetsuisse Faculty, University of Bern, Switzerland.,Veterinary Public Health Institute (C Nathues), Vetsuisse Faculty, University of Bern, Switzerland.,Faculty of Veterinary Medicine, University of Perugia, Perugia, Italy (De Luca)
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9
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Mahu M, Pasmans F, Vranckx K, De Pauw N, Vande Maele L, Vyt P, Vandersmissen T, Martel A, Haesebrouck F, Boyen F. Presence and mechanisms of acquired antimicrobial resistance in Belgian Brachyspira hyodysenteriae isolates belonging to different clonal complexes. Vet Microbiol 2017; 207:125-132. [DOI: 10.1016/j.vetmic.2017.05.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 05/16/2017] [Accepted: 05/26/2017] [Indexed: 11/17/2022]
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10
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Borgström A, Scherrer S, Kirchgässner C, Schmitt S, Frei D, Wittenbrink MM. A novel multiplex qPCR targeting 23S rDNA for diagnosis of swine dysentery and porcine intestinal spirochaetosis. BMC Vet Res 2017; 13:42. [PMID: 28173799 PMCID: PMC5297149 DOI: 10.1186/s12917-016-0939-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 12/24/2016] [Indexed: 11/16/2022] Open
Abstract
Background A multiplex qPCR targeting a 128 bp region on the 23S rDNA gene was developed for detection of Brachyspira (B.) hyodysenteriae and B. pilosicoli, the agents of swine dysentery (SD) and porcine intestinal spirochaetosis (PIS), together with a triplet of apathogenic Brachyspira spp. (B. innocens, B. intermedia, B. murdochii) in porcine feces. The multiplex qPCR was evaluated against a duplex PCR (La et al., J Clin Microbiol 41:3372–5, 2003). Results Using DNA extracted from fecal culture, the multiplex qPCR showed excellent agreement with the duplex PCR (κ = 0.943 and 0.933). In addition, thanks to the three probes whereof one detecting the apathogenic Brachyspria spp., a more diversified overview of the brachyspiral flora in porcine fecal samples can be delivered as a part of the routine diagnostic. The multiplex qPCR with a limit of detection of 5–10 genomic equivalents (GE) per reaction (6 × 102 GE per gram) allows reliable detection of Brachyspira species directly from fecal swab DNA. In line with this, analysis of 202 fecal swabs in comparison with culture-based qPCR showed a high agreement for the causative agents of SD (B.hyodysenteriae: κ = 0.853, sensitivity 87% specificity 98%). Conclusion The novel multiplex qPCR is robust and has a high analytical sensitivity and is therefore suitable for high-throughput screening of porcine fecal swabs for the causative agents of SD. This assay can therefore be used for the direct proof of the pathogenic B. spp. in fecal swabs within the scope of a monitoring program. Electronic supplementary material The online version of this article (doi:10.1186/s12917-016-0939-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Anna Borgström
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 270, CH 8057, Zurich, Switzerland.
| | - Simone Scherrer
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 270, CH 8057, Zurich, Switzerland
| | - Constanze Kirchgässner
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 270, CH 8057, Zurich, Switzerland
| | - Sarah Schmitt
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 270, CH 8057, Zurich, Switzerland
| | - Daniel Frei
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 270, CH 8057, Zurich, Switzerland
| | - Max M Wittenbrink
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 270, CH 8057, Zurich, Switzerland
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11
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Abstract
Swine dysentery is a severe enteric disease in pigs, which is characterized by bloody to mucoid diarrhea and associated with reduced growth performance and variable mortality. This disease is most often observed in grower–finisher pigs, wherein susceptible pigs develop a significant mucohemorrhagic typhlocolitis following infection with strongly hemolytic spirochetes of the genus Brachyspira. While swine dysentery is endemic in many parts of the world, the disease had essentially disappeared in much of the United States by the mid-1990s as a result of industry consolidation and effective treatment, control, and elimination methods. However, since 2007, there has been a reported increase in laboratory diagnosis of swine dysentery in parts of North America along with the detection of novel pathogenic Brachyspira spp worldwide. Accordingly, there has been a renewed interest in swine dysentery and Brachyspira spp infections in pigs, particularly in areas where the disease was previously eliminated. This review provides an overview of knowledge on the etiology, pathogenesis, and diagnosis of swine dysentery, with insights into risk factors and control.
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Affiliation(s)
- E. R. Burrough
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, USA
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12
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Mahu M, De Pauw N, Vande Maele L, Verlinden M, Boyen F, Ducatelle R, Haesebrouck F, Martel A, Pasmans F. Variation in hemolytic activity of Brachyspira hyodysenteriae strains from pigs. Vet Res 2016; 47:66. [PMID: 27338265 PMCID: PMC4917944 DOI: 10.1186/s13567-016-0353-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 06/05/2016] [Indexed: 11/30/2022] Open
Abstract
Brachyspira hyodysenteriae is the primary cause of swine dysentery, which is responsible for major economic losses to the pig industry worldwide. The hemolytic activity of 10 B. hyodysenteriae strains isolated from stools of pigs with mild to mucohemorrhagic diarrhea was compared and seven hemolysis associated genes were sequenced. Hemolysis induced by these strains varied from strong to near absent. One weakly hemolytic B. hyodysenteriae strain showed sequence changes in five hemolysis associated genes (tlyA, tlyB, hemolysin III, hemolysin activation protein and hemolysin III channel protein) resulting in amino acid substitutions. The occurrence of weakly hemolytic strains identifiable as B. hyodysenteriae should be taken into account in swine dysentery diagnostics. The presence of these strains may affect herd dysentery status, with great impact on a farms trading opportunities.
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Affiliation(s)
- Maxime Mahu
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium
| | - Nele De Pauw
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium
| | - Lien Vande Maele
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium.,Technology and Food Science Unit, Institute for Agricultural and Fisheries Research (ILVO), Brusselsesteenweg 370, B-9090, Melle, Belgium
| | - Marc Verlinden
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium
| | - Filip Boyen
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium
| | - Richard Ducatelle
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium
| | - Freddy Haesebrouck
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium
| | - An Martel
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium
| | - Frank Pasmans
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium.
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13
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Grahofer A, Overesch G, Nathues H, Zeeh F. Effect of soy on faecal dry matter content and excretion of Brachyspira hyodysenteriae in pigs. Vet Rec Open 2016; 3:e000159. [PMID: 27239320 PMCID: PMC4860860 DOI: 10.1136/vetreco-2015-000159] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 03/05/2016] [Accepted: 03/24/2016] [Indexed: 02/02/2023] Open
Abstract
The aim of this study was to investigate the effect of a soy diet on the excretion of Brachyspira hyodysenteriae in five farms with subclinically infected pigs. The effects on general health, faecal consistency and dry matter were analysed. In total, 200 pigs of different ages (group 1 <100 days of age (n=120) and group 2 ≥100 days (n=80)) were randomly assigned to the control (C) and the treatment (T) groups. Group C received the farm's standard diet. In group T half of the daily feed ration was replaced by pure soy on two consecutive days. Faecal scores were used to determine faecal consistency and a microwave method to assess faecal dry matter content (FDMC). In age group 1, soy feeding resulted in a statistically significant decrease of the FDMC of 2.5 per cent compared with group C and in age group 2 in a significant increase of 2.2 per cent compared with group C at day 2. Overall seven (T: 5, C: 2) out of 597 faecal samples tested positive for B hyodysenteriae by PCR. In conclusion, a high soy diet applied over two days influenced the faecal consistency and the FDMC in growers, finishers and sows under field conditions. Further investigations with more sensitive diagnostic methods are needed to prove a potential influence of a high soy diet on the detection rate of B hyodysenteriae in subclinically infected herds.
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Affiliation(s)
- Alexander Grahofer
- Department of Clinical Veterinary Medicine, Vetsuisse Faculty , Clinic for Swine, University of Bern , Bern , Switzerland
| | - Gudrun Overesch
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty , Institute of Veterinary Bacteriology, University of Bern , Bern , Switzerland
| | - Heiko Nathues
- Department of Clinical Veterinary Medicine, Vetsuisse Faculty , Clinic for Swine, University of Bern , Bern , Switzerland
| | - Friederike Zeeh
- Department of Clinical Veterinary Medicine, Vetsuisse Faculty , Clinic for Swine, University of Bern , Bern , Switzerland
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14
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Illanes NV, Tamiozzo PJ, Cabral A, Bertone J, Romanini S, Yaciuk R, Vázquez M, Pelliza BR. [Detection of Brachyspira pilosicoli and other Brachyspira species in Argentine poultry farms]. Rev Argent Microbiol 2016; 48:67-70. [PMID: 26952690 DOI: 10.1016/j.ram.2015.12.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 12/09/2015] [Accepted: 12/21/2015] [Indexed: 11/30/2022] Open
Abstract
Some species of the genus Brachyspira such as Brachyspira pilosicoli, Brachyspira intermedia and Brachyspira alvinipulli are pathogenic species capable of producing disease in laying hens. In our country, the presence of B. pilosicoli and other species of Brachyspira has been reported in pigs and dogs but there is no record of their presence in poultry. Fecal and cecal content samples from 34 laying hens of 4, 12 and 24 months of age from two farms were analyzed by isolation, biochemical tests and PCR. B. pilosicoli and Brachyspira spp. were identified in samples taken from laying hens of 12 and 24 months of age.
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Affiliation(s)
- Natalia V Illanes
- Departamento de Patología Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, República Argentina.
| | - Pablo J Tamiozzo
- Departamento de Patología Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, República Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), República Argentina
| | - Ana Cabral
- Departamento de Patología Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, República Argentina
| | - Judith Bertone
- Departamento de Patología Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, República Argentina
| | - Silvia Romanini
- Departamento de Patología Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, República Argentina
| | - Raúl Yaciuk
- Departamento de Patología Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, República Argentina
| | - Mercedes Vázquez
- Departamento de Patología Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, República Argentina
| | - Bibiana R Pelliza
- Departamento de Patología Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, República Argentina
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15
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Löbert S, Zimmermann W, Bürki S, Frey J, Nathues H, Scheer P, Doherr MG, Stalder U, Zeeh F. Occurrence of Brachyspira hyodysenteriae in multiplier pig herds in Switzerland. Tierarztl Prax Ausg G Grosstiere Nutztiere 2016; 44:13-8. [PMID: 26757784 DOI: 10.15653/tpg-150674] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Accepted: 11/23/2015] [Indexed: 01/07/2023]
Abstract
OBJECTIVE This research was aimed to determine the occurrence of Brachyspira (B.) hyodysenteriae in Swiss multiplier pig herds. MATERIALS AND METHODS In a pilot study a direct real-time polymerase chain reaction (PCR) method for B. hyodysenteriae was compared to culture followed by PCR on 106 samples from three herds. Subsequently 40 multiplier herds were epidemiologically characterized and analysed for the presence of B. hyodysenteriae using direct PCR on 1412 rectal swabs. For external validation 20 swabs obtained from two positive conventional herds were analysed. RESULTS The comparison of direct PCR with culture followed by PCR resulted in a moderate agreement (kappa index: 0.58). In the two conventional herds, 35% of the samples (7/20) tested positive. Samples from 39 multipliers tested negative. In one multiplier herd, 25% (9/36) of the samples tested PCR positive. Risk factors in the multiplier herd may have been rodents or birds, but not pig purchase. CONCLUSION AND CLINICAL RELEVANCE B. hyodysenteriae have been detected in a Swiss multiplier herd, which underlines the threat of potential spread by replacement pigs. Consequently, a Brachyspira monitoring programme was established for Swiss multiplier herds.
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Affiliation(s)
| | | | | | | | | | | | | | | | - F Zeeh
- Dr. Friederike Zeeh, Clinic for Swine, Vetsuisse Faculty, University of Bern, Bremgartenstrasse 109a, 3001 Bern, Switzerland,
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16
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Jansson DS, Mushtaq M, Johansson KE, Bonnedahl J, Waldenström J, Andersson DI, Broman T, Berg C, Olsen B. Intestinal spirochaetes (genus Brachyspira) colonise wild birds in the southern Atlantic region and Antarctica. Infect Ecol Epidemiol 2015; 5:29296. [PMID: 26584828 PMCID: PMC4653322 DOI: 10.3402/iee.v5.29296] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 10/19/2015] [Accepted: 10/22/2015] [Indexed: 11/14/2022] Open
Abstract
Introduction The genus Brachyspira contains well-known enteric pathogens of veterinary significance, suggested agents of colonic disease in humans, and one potentially zoonotic agent. There are recent studies showing that Brachyspira are more widespread in the wildlife community than previously thought. There are no records of this genus in wildlife from the southern Atlantic region and Antarctica. Our aim was therefore, to determine whether intestinal spirochaetes of genus Brachyspira colonise marine and coastal birds in this region. Method Faecal samples were collected from marine and coastal birds in the southern Atlantic region, including sub-Antarctic islands and Antarctica, in 2002, 2009, and 2012, with the aim to isolate and characterise zoonotic agents. In total, 205 samples from 11 bird species were selectively cultured for intestinal spirochaetes of genus Brachyspira. To identify isolates to species level, they were subjected to phenotyping, species-specific polymerase chain reactions, sequencing of partial 16S rRNA, NADH oxidase (nox), and tlyA genes, and phylogenetic analysis. Antimicrobial susceptibility tests were performed. Results Fourteen unique strains were obtained from 10 birds of three species: four snowy sheathbills (Chionis albus), three kelp geese (Chloephaga hybrida subsp. malvinarum), and three brown skua (Stercorarius antarcticus subsp. lonnbergi) sampled on the Falkland Islands, Tierra del Fuego in Argentina, South Georgia, South Shetland Islands, and the Antarctic Peninsula. Five Brachyspira strains were closely related to potentially enteropathogenic Brachyspira sp. of chickens: B. intermedia (n=2, from snowy sheathbills), and B. alvinipulli (n=3, from a kelp goose and two snowy sheathbills). Three strains from kelp geese were most similar to the presumed non-pathogenic species ‘B. pulli’ and B. murdochii, whereas the remaining six strains could not be attributed to currently known species. No isolates related to human strains were found. None of the tested strains showed decreased susceptibility to tiamulin, valnemulin, doxycycline, tylvalosin, lincomycin, or tylosin. Conclusions This is the first report of intestinal spirochaetes from this region. Despite limitations of current diagnostic methods, our results, together with earlier studies, show that Brachyspira spp., including potentially pathogenic strains, occur globally among free-living avian hosts, and that this genus encompasses a higher degree of biodiversity than previously recognised.
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Affiliation(s)
- Désirée S Jansson
- Department of Animal Health and Antimicrobial Strategies, National Veterinary Institute, Uppsala, Sweden;
| | - Memoona Mushtaq
- Department of Animal Breeding and Genetics, Global Bioinformatics Centre, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden
| | - Karl-Erik Johansson
- Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Jonas Bonnedahl
- Department of Infectious Diseases, Kalmar County Hospital, Kalmar, Sweden.,Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar, Sweden
| | - Jonas Waldenström
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, Kalmar, Sweden
| | - Dan I Andersson
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Tina Broman
- Division of CBRN Defence and Security, FOI - Swedish Defence Research Agency, Umeå, Sweden
| | - Charlotte Berg
- Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Skara, Sweden
| | - Björn Olsen
- Section of Infectious Diseases, Department of Medical Sciences, Uppsala University, Uppsala, Sweden
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17
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Hampson DJ, La T, Phillips ND. Emergence of Brachyspira species and strains: reinforcing the need for surveillance. Porcine Health Manag 2015; 1:8. [PMID: 28694985 PMCID: PMC5499009 DOI: 10.1186/s40813-015-0002-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 06/05/2015] [Indexed: 11/24/2022] Open
Abstract
This short review discusses the increasing complexity that has developed around the understanding of Brachyspira species that infect pigs, and their ability to cause disease. It describes the recognition of new weakly haemolytic Brachyspira species, and the growing appreciation that Brachyspira pilosicoli and some other weakly haemolytic species may be pathogenic in pigs. It discusses swine dysentery (SD) caused by the strongly haemolytic Brachyspira hyodysenteriae, particularly the cyclical nature of the disease whereby it can largely disappear as a clinical problem from a farm or region, and re-emerge years later. The review then describes the recent emergence of two newly described strongly haemolytic pathogenic species, “Brachyspira suanatina” and “Brachyspira hampsonii” both of which appear to have reservoirs in migratory waterbirds, and which may be transmitted to and between pigs. “B. suanatina” seems to be confined to Scandinavia, whereas “B. hampsonii” has been reported in North America and Europe, causes a disease indistinguishable from SD, and has required the development of new routine diagnostic tests. Besides the emergence of new species, strains of known Brachyspira species have emerged that vary in important biological properties, including antimicrobial susceptibility and virulence. Strains can be tracked locally and at the national and international levels by identifying them using multilocus sequence typing (MLST) and comparing them against sequence data for strains in the PubMLST databases. Using MLST in conjunction with data on antimicrobial susceptibility can form the basis for surveillance programs to track the movement of resistant clones. In addition some strains of B. hyodysenteriae have low virulence potential, and some of these have been found to lack the B. hyodysenteriae 36 kB plasmid or certain genes on the plasmid whose activity may be associated with colonization. Lack of the plasmid or the genes can be identified using PCR testing, and this information can be added to the MLST and resistance data to undertake detailed surveillance. Strains of low virulence are particularly important where they occur in high health status breeding herds without causing obvious disease: potentially they could be transmitted to production herds where they may colonize more effectively and cause disease under stressful commercial conditions.
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Affiliation(s)
- David J Hampson
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA 6112 Australia
| | - Tom La
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA 6112 Australia
| | - Nyree D Phillips
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA 6112 Australia
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18
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Hartnack S, Nathues C, Nathues H, Grosse Beilage E, Lewis FI. Estimating diagnostic test accuracies for Brachyspira hyodysenteriae accounting for the complexities of population structure in food animals. PLoS One 2014; 9:e98534. [PMID: 24906140 PMCID: PMC4048188 DOI: 10.1371/journal.pone.0098534] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2013] [Accepted: 05/05/2014] [Indexed: 11/18/2022] Open
Abstract
For swine dysentery, which is caused by Brachyspira hyodysenteriae infection and is an economically important disease in intensive pig production systems worldwide, a perfect or error-free diagnostic test (“gold standard”) is not available. In the absence of a gold standard, Bayesian latent class modelling is a well-established methodology for robust diagnostic test evaluation. In contrast to risk factor studies in food animals, where adjustment for within group correlations is both usual and required for good statistical practice, diagnostic test evaluation studies rarely take such clustering aspects into account, which can result in misleading results. The aim of the present study was to estimate test accuracies of a PCR originally designed for use as a confirmatory test, displaying a high diagnostic specificity, and cultural examination for B. hyodysenteriae. This estimation was conducted based on results of 239 samples from 103 herds originating from routine diagnostic sampling. Using Bayesian latent class modelling comprising of a hierarchical beta-binomial approach (which allowed prevalence across individual herds to vary as herd level random effect), robust estimates for the sensitivities of PCR and culture, as well as for the specificity of PCR, were obtained. The estimated diagnostic sensitivity of PCR (95% CI) and culture were 73.2% (62.3; 82.9) and 88.6% (74.9; 99.3), respectively. The estimated specificity of the PCR was 96.2% (90.9; 99.8). For test evaluation studies, a Bayesian latent class approach is well suited for addressing the considerable complexities of population structure in food animals.
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Affiliation(s)
- Sonja Hartnack
- Section of Epidemiology, Vetsuisse Faculty, Zurich, Switzerland
- * E-mail:
| | - Christina Nathues
- Veterinary Public Health Institute, Vetsuisse Faculty, Liebefeld, Switzerland
| | - Heiko Nathues
- Department of Production and Population Health, Royal Veterinary College London, London, United Kingdom
- Department of Clinical Veterinary Medicine, Vetsuisse Faculty, Zurich, Switzerland
| | - Elisabeth Grosse Beilage
- Field Station for Epidemiology, University of Veterinary Medicine Hannover, Foundation, Bakum, Germany
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19
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Mahu M, de Jong E, De Pauw N, Vande Maele L, Vandenbroucke V, Vandersmissen T, Miry C, Pasmans F, Haesebrouck F, Martel A, Boyen F. First isolation of “Brachyspira hampsonii”
from pigs in Europe. Vet Rec 2014; 174:47. [DOI: 10.1136/vr.101868] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- M. Mahu
- Department of Pathology; Bacteriology and Poultry Diseases; Faculty of Veterinary Medicine; Ghent University; Salisburylaan 133 Merelbeke 9820 Belgium
| | - E. de Jong
- Animal Health Care Flanders; Deinse Horsweg 1 Drongen B-9031 Belgium
| | - N. De Pauw
- Department of Pathology; Bacteriology and Poultry Diseases; Faculty of Veterinary Medicine; Ghent University; Salisburylaan 133 Merelbeke 9820 Belgium
| | - L. Vande Maele
- Department of Pathology; Bacteriology and Poultry Diseases; Faculty of Veterinary Medicine; Ghent University; Salisburylaan 133 Merelbeke 9820 Belgium
- Institute for Agricultural and Fisheries Research (ILVO); Brusselsesteenweg 370 Melle B-9090 Belgium
| | - V. Vandenbroucke
- Animal Health Care Flanders; Deinse Horsweg 1 Drongen B-9031 Belgium
| | - T. Vandersmissen
- Animal Health Care Flanders; Deinse Horsweg 1 Drongen B-9031 Belgium
| | - C. Miry
- Animal Health Care Flanders; Deinse Horsweg 1 Drongen B-9031 Belgium
| | - F. Pasmans
- Department of Pathology; Bacteriology and Poultry Diseases; Faculty of Veterinary Medicine; Ghent University; Salisburylaan 133 Merelbeke 9820 Belgium
| | - F. Haesebrouck
- Department of Pathology; Bacteriology and Poultry Diseases; Faculty of Veterinary Medicine; Ghent University; Salisburylaan 133 Merelbeke 9820 Belgium
| | - A. Martel
- Department of Pathology; Bacteriology and Poultry Diseases; Faculty of Veterinary Medicine; Ghent University; Salisburylaan 133 Merelbeke 9820 Belgium
| | - F. Boyen
- Department of Pathology; Bacteriology and Poultry Diseases; Faculty of Veterinary Medicine; Ghent University; Salisburylaan 133 Merelbeke 9820 Belgium
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20
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Martínez-Lobo FJ, Hidalgo Á, García M, Argüello H, Naharro G, Carvajal A, Rubio P. First identification of "Brachyspira hampsonii" in wild European waterfowl. PLoS One 2013; 8:e82626. [PMID: 24349322 PMCID: PMC3857821 DOI: 10.1371/journal.pone.0082626] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 10/25/2013] [Indexed: 11/18/2022] Open
Abstract
Anseriformes deserve special attention in the epidemiology of Brachyspira spp. because diverse Anseriformes species have been described to act as highly efficient carriers of several Brachyspira spp. that can also infect livestock. The aim of this study was to investigate the prevalence and diversity of Brachyspira spp. in waterfowl that winter in Spain. Brachyspira spp. were isolated from 51 of the 205 faecal samples collected from graylag geese and mallards in the Villafáfila Lagoons Nature Reserve (Northwestern Spain). The Brachyspira species identified through phenotyping, PCR and sequencing of the nox gene were B. pilosicoli (5.9%), B. alvinipulli (11.8%), "B. hampsonii" (19.6%), B. murdochii (23.5%) and B. innocens (39.2%). The most relevant finding of this study is the description of "B. hampsonii" in specimens from birds for the first time. Phylogenetic analysis of the nox gene sequences grouped all of the obtained "B. hampsonii" isolates into a cluster with Brachyspira strains previously identified by others as "B. hampsonii" and separated from other Brachyspira spp. isolates and reference strains. Additionally, this cluster was related to clades that grouped B. murdochii and B. innocens isolates. The identification of "B. hampsonii" was also achieved in 8 of the 10 isolates by sequencing the16S rRNA gene and tlyA gene. Regardless of the species identified, no antimicrobial resistance was observed in any of the enteropathogenic isolates recovered. This is the first description of "B. hampsonii" in European waterfowl, which might represent hosts that serve as natural reservoirs of this Brachyspira species. This finding indicates that this spirochete is not limited to North America, and its presence in wild birds in Europe poses a risk of transmission to livestock.
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Affiliation(s)
| | - Álvaro Hidalgo
- Infectious Diseases and Epidemiology Unit, Faculty of Veterinary Medicine, University of León, León, Spain
| | - Marta García
- Infectious Diseases and Epidemiology Unit, Faculty of Veterinary Medicine, University of León, León, Spain
| | - Héctor Argüello
- Infectious Diseases and Epidemiology Unit, Faculty of Veterinary Medicine, University of León, León, Spain
| | - Germán Naharro
- Infectious Diseases and Epidemiology Unit, Faculty of Veterinary Medicine, University of León, León, Spain
| | - Ana Carvajal
- Infectious Diseases and Epidemiology Unit, Faculty of Veterinary Medicine, University of León, León, Spain
| | - Pedro Rubio
- Infectious Diseases and Epidemiology Unit, Faculty of Veterinary Medicine, University of León, León, Spain
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21
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Mappley LJ, La Ragione RM, Woodward MJ. Brachyspira and its role in avian intestinal spirochaetosis. Vet Microbiol 2013; 168:245-60. [PMID: 24355534 DOI: 10.1016/j.vetmic.2013.11.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Revised: 11/17/2013] [Accepted: 11/18/2013] [Indexed: 10/26/2022]
Abstract
The fastidious, anaerobic spirochaete Brachyspira is capable of causing enteric disease in avian, porcine and human hosts, amongst others, with a potential for zoonotic transmission. Avian intestinal spirochaetosis (AIS), the resulting disease from colonisation of the caeca and colon of poultry by Brachyspira leads to production losses, with an estimated annual cost of circa £ 18 million to the commercial layer industry in the United Kingdom. Of seven known and several proposed species of Brachyspira, three are currently considered pathogenic to poultry; B. alvinipulli, B. intermedia and B. pilosicoli. Currently, AIS is primarily prevented by strict biosecurity controls and is treated using antimicrobials, including tiamulin. Other treatment strategies have been explored, including vaccination and probiotics, but such developments have been hindered by a limited understanding of the pathobiology of Brachyspira. A lack of knowledge of the metabolic capabilities and little genomic information for Brachyspira has resulted in a limited understanding of the pathobiology. In addition to an emergence of antibiotic resistance amongst Brachyspira, bans on the prophylactic use of antimicrobials in livestock are driving an urgent requirement for alternative treatment strategies for Brachyspira-related diseases, such as AIS. Advances in the molecular biology and genomics of Brachyspira heralds the potential for the development of tools for genetic manipulation to gain an improved understanding of the pathogenesis of Brachyspira.
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Affiliation(s)
- Luke J Mappley
- Department of Bacteriology, Animal Health and Veterinary Laboratories Agency, Addlestone, Surrey KT15 3NB, UK; Department of Food and Nutritional Sciences, University of Reading, Reading, Berkshire RG6 6AP, UK.
| | - Roberto M La Ragione
- Department of Bacteriology, Animal Health and Veterinary Laboratories Agency, Addlestone, Surrey KT15 3NB, UK; School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK
| | - Martin J Woodward
- Department of Food and Nutritional Sciences, University of Reading, Reading, Berkshire RG6 6AP, UK
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Prohaska S, Pflüger V, Ziegler D, Scherrer S, Frei D, Lehmann A, Wittenbrink M, Huber H. MALDI-TOF MS for identification of porcine Brachyspira
species. Lett Appl Microbiol 2013; 58:292-8. [DOI: 10.1111/lam.12189] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 10/09/2013] [Accepted: 10/28/2013] [Indexed: 12/01/2022]
Affiliation(s)
- S. Prohaska
- Vetsuisse Faculty; Institute of Veterinary Bacteriology; University of Zurich; Zurich Switzerland
| | | | | | - S. Scherrer
- Vetsuisse Faculty; Institute of Veterinary Bacteriology; University of Zurich; Zurich Switzerland
| | - D. Frei
- Vetsuisse Faculty; Institute of Veterinary Bacteriology; University of Zurich; Zurich Switzerland
| | - A. Lehmann
- Vetsuisse Faculty; Institute of Veterinary Bacteriology; University of Zurich; Zurich Switzerland
| | - M.M. Wittenbrink
- Vetsuisse Faculty; Institute of Veterinary Bacteriology; University of Zurich; Zurich Switzerland
| | - H. Huber
- Vetsuisse Faculty; Institute of Veterinary Bacteriology; University of Zurich; Zurich Switzerland
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Patterson AH, Rubin JE, Fernando C, Costa MO, Harding JCS, Hill JE. Fecal shedding of Brachyspira spp. on a farrow-to-finish swine farm with a clinical history of "Brachyspira hampsonii"-associated colitis. BMC Vet Res 2013; 9:137. [PMID: 23844564 PMCID: PMC3716975 DOI: 10.1186/1746-6148-9-137] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 07/10/2013] [Indexed: 12/02/2022] Open
Abstract
Background Brachyspira associated diarrhea is a re-emerging concern for Canadian swine producers. To identify critical control points for reducing the impact of Brachyspira on production, improved diagnostic tools and a better understanding of the on-farm epidemiology of these pathogens are required. A cross-sectional study was conducted for the detection of Brachyspira on a commercial, two-site, farrow-to-finish pork production unit in Saskatchewan, Canada with a clinical history of mucohaemorrhagic colitis associated with “B. hampsonii”. Results Rectal swabs from pigs at all production stages were collected over 13 weeks (n = 866). Two swabs were collected per pig for culture and Gram stain, and for PCR. Ninety-one culture positive samples were detected, with the highest prevalence of Brachyspira shedding in grower pigs (21%). No Brachyspira were detected in pre-weaned piglets. PCR and Gram stain of rectal swabs detected fewer positive samples than culture. The most prevalent species detected was B. murdochii; other species detected included B. pilosicoli, B. innocens, and “Brachyspira hampsonii”. Phylogenetic analysis revealed that several of the isolates, including some strongly beta-haemolytic isolates, might represent novel taxa. Conclusions Our results indicate that apparently healthy pigs can be colonized with diverse Brachyspira species, including some potential pathogens, and that frequency of shedding peaks in the grower stage. Difference in the detection rates of Brachyspira amongst culture, Gram stain or PCR on rectal swabs have implications for choice of detection methods and surveillance approaches that may be most effective in Brachyspira control strategies.
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Affiliation(s)
- Amy H Patterson
- Department of Veterinary Microbiology, University of Saskatchewan, 52 Campus Drive, Saskatoon, SK S7N 5B4, Canada
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24
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Burrough ER, Strait EL, Kinyon JM, Bower LP, Madson DM, Wilberts BL, Schwartz KJ, Frana TS, Songer JG. Comparative virulence of clinical Brachyspira spp. isolates in inoculated pigs. J Vet Diagn Invest 2012; 24:1025-34. [PMID: 22956484 DOI: 10.1177/1040638712457927] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Classical swine dysentery is associated with the presence of the strongly beta-hemolytic Brachyspira hyodysenteriae. However, multiple Brachyspira spp. can colonize the porcine colon. Since 2008, several Brachyspira spp. not identified as B. hyodysenteriae by genotypic and/or phenotypic methods have been isolated from the feces of pigs with clinical disease typical of swine dysentery. In the current study, 8 clinical isolates, including 5 strongly beta-hemolytic and 3 weakly beta-hemolytic Brachyspira strains, and a reference strain of B. hyodysenteriae (B204) were inoculated into pigs (n = 6 per isolate) to compare pathogenic potential following oral inoculation. Results revealed that strongly beta-hemolytic isolates induced significantly greater typhlocolitis than those that are weakly beta-hemolytic, regardless of the genetic identification of the isolate, and that strongly beta-hemolytic isolates identified as "Brachyspira sp. SASK30446" and Brachyspira intermedia by polymerase chain reaction (PCR) produced lesions similar to those caused by B. hyodysenteriae. The results suggest that phenotypic culture characteristics of Brachyspira spp. may be a more sensitive indicator of potential to induce dysentery-like disease in pigs than molecular identification alone based on currently available PCR assays. Additionally, culture of mucosal scrapings obtained at necropsy was more sensitive than direct PCR on the same samples for detection of Brachyspira spp.
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Affiliation(s)
- Eric R Burrough
- Departments of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, USA.
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25
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Lugsomya K, Tummaruk P, Hampson D, Prapasarakul N. Development of a modified selective medium to enhance the recovery rate of Brachyspira hyodysenteriae and other porcine intestinal spirochaetes from faeces. Lett Appl Microbiol 2012; 54:330-5. [DOI: 10.1111/j.1472-765x.2012.03213.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Phenotypic and genetic diversity among intestinal spirochaetes (genus Brachyspira) in free-living wild mallards (Anas platyrhynchos) sampled in southern Sweden. Syst Appl Microbiol 2011; 34:566-75. [DOI: 10.1016/j.syapm.2011.10.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Revised: 07/07/2011] [Accepted: 10/03/2011] [Indexed: 11/21/2022]
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27
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Jacobson M, Andersson M, Lindberg R, Fossum C, Jensen-Waern M. Microarray and cytokine analyses of field cases of pigs with diarrhoea. Vet Microbiol 2011; 153:307-14. [DOI: 10.1016/j.vetmic.2011.06.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Revised: 06/03/2011] [Accepted: 06/07/2011] [Indexed: 11/26/2022]
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28
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Clothier KA, Kinyon JM, Frana TS, Naberhaus N, Bower L, Strait EL, Schwartz K. Species characterization and minimum inhibitory concentration patterns of Brachyspira species isolates from swine with clinical disease. J Vet Diagn Invest 2011; 23:1140-5. [DOI: 10.1177/1040638711425580] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Typhlocolitis and dysentery due to Brachyspira hyodysenteriae infection represent an economically important disease syndrome in growing pigs. Largely disappearing from U.S. swine herds in the late 1990s and early 2000s, Brachyspira-associated disease and bacterial isolation from swine with clinical disease has increased in the last several years, and non– B. hyodysenteriae isolates are commonly identified. Antimicrobial resistance has been demonstrated in Brachyspira spp. isolates from Europe and Asia, and may be the reason for the resurgence in U.S. herds. Seventy-nine clinical isolates identified at the Iowa State University Veterinary Diagnostic Lab were tested with multiple polymerase chain reaction assays to establish species identity, and evaluated for minimum inhibitory concentrations (MICs) using an agar dilution method against lincomycin, gentamicin, valnemulin, tiamulin, salinomycin, and carbadox. Only 38.0% of isolates could be confirmed as the known pathogens B. hyodysenteriae (30.4%) or Brachyspira pilosicoli (7.6%). Twenty of the 79 isolates (25.3%) were identified as Brachyspira murdochii, and 13.9% could not be identified to species. The MIC values were consistently high against lincomycin and moderately high against gentamicin. The remaining antimicrobials had MICs that were at the low end of the test ranges. Brachyspira murdochii and Brachyspira spp. had significantly greater MIC values against several of these drugs than other Brachyspira spp. examined. The increased incidence of these less definitively characterized Brachyspira species with increased MIC values to commonly prescribed antimicrobials may, at least in part, explain the increased prevalence and severity of this disease complex in recent years. Further research is necessary to understand these changes.
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Affiliation(s)
- Kristin A. Clothier
- Iowa State University Veterinary Diagnostic Laboratory, Department of Veterinary and Production Animal Medicine, Iowa State University, College of Veterinary Medicine, Ames, IA
| | - Joann M. Kinyon
- Iowa State University Veterinary Diagnostic Laboratory, Department of Veterinary and Production Animal Medicine, Iowa State University, College of Veterinary Medicine, Ames, IA
| | - Timothy S. Frana
- Iowa State University Veterinary Diagnostic Laboratory, Department of Veterinary and Production Animal Medicine, Iowa State University, College of Veterinary Medicine, Ames, IA
| | - Nadine Naberhaus
- Iowa State University Veterinary Diagnostic Laboratory, Department of Veterinary and Production Animal Medicine, Iowa State University, College of Veterinary Medicine, Ames, IA
| | - Leslie Bower
- Iowa State University Veterinary Diagnostic Laboratory, Department of Veterinary and Production Animal Medicine, Iowa State University, College of Veterinary Medicine, Ames, IA
| | - Erin L. Strait
- Iowa State University Veterinary Diagnostic Laboratory, Department of Veterinary and Production Animal Medicine, Iowa State University, College of Veterinary Medicine, Ames, IA
| | - Kent Schwartz
- Iowa State University Veterinary Diagnostic Laboratory, Department of Veterinary and Production Animal Medicine, Iowa State University, College of Veterinary Medicine, Ames, IA
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Demonstration of genes encoding virulence and virulence life-style factors in Brachyspira spp. isolates from pigs. Vet Microbiol 2011; 155:438-43. [PMID: 22047713 DOI: 10.1016/j.vetmic.2011.09.032] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Revised: 09/28/2011] [Accepted: 09/30/2011] [Indexed: 11/21/2022]
Abstract
The distribution of many genes encoding virulence and virulence life-style (VL-S) factors in Brachyspira (B.) hyodysenteriae and other Brachyspira species are largely unknown. Their knowledge is essential e.g. for the improvement of diagnostic methods targeting the detection and differentiation of the species. Thus 121 German Brachyspira field isolates from diarrhoeic pigs were characterized down to the species level by restriction fragment length polymorphism analysis of the nox gene and subsequently subjected to polymerase chain reaction detecting VL-S genes for inner (clpX) and outer membrane proteins (OMPs: bhlp16, bhlp17.6, bhlp29.7, bhmp39f, bhmp39h), hemolysins (hlyA/ACP, tlyA), iron metabolism (ftnA, bitC), and aerotolerance (nox). For comparison, B. hyodysenteriae reference strains from the USA (n=7) and Australia (2) were used. Of all genes tested only nox was detected in all isolates. The simultaneous presence of both the tlyA and hlyA/ACP was restricted to the species B. hyodysenteriae. The hlyA infrequently occurred also in weakly hemolytic Brachyspira. Similarly to tlyA and hlyA all B. hyodysenteriae strains contained the ferritin gene ftnA which was also found in two Brachyspira intermedia isolates. OMP encoding genes were present in B. hyodysenteriae field isolates in rates of 0% (bhlp17.6, bhmp39h), 58.1% (bhlp29.7), and 97.3% (bhmp39f). Since the study revealed a high genetic heterogeneity among German B. hyodysenteriae field isolates differentiating them from USA as well as Australian strains, targets for diagnostic PCR were limited to the nox gene (genus specific PCR) as well as to the species specific nox(hyo) gene and the combination of hlyA and tlyA which allow to specifically detect B. hyodysenteriae.
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Jansson DS, Pringle M. Antimicrobial susceptibility ofBrachyspiraspp. isolated from commercial laying hens and free-living wild mallards (Anas platyrhynchos). Avian Pathol 2011; 40:387-93. [DOI: 10.1080/03079457.2011.588197] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Trends towards lower antimicrobial susceptibility and characterization of acquired resistance among clinical isolates of Brachyspira hyodysenteriae in Spain. Antimicrob Agents Chemother 2011; 55:3330-7. [PMID: 21555771 DOI: 10.1128/aac.01749-10] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The antimicrobial susceptibility of clinical isolates of Brachyspira hyodysenteriae in Spain was monitored, and the underlying molecular mechanisms of resistance were investigated. MICs of tylosin, tiamulin, valnemulin, lincomycin, and tylvalosin were determined for 87 B. hyodysenteriae isolates recovered from 2008 to 2009 by broth dilution. Domain V of the 23S rRNA gene and the ribosomal protein L3 gene were sequenced in 20 isolates for which the tiamulin MIC was ≥ 4 μg/ml, presenting decreased susceptibility, and in 18 tiamulin-susceptible isolates (MIC ≤ 0.125 μg/ml), and all isolates were typed by multiple-locus variable-number tandem repeats analysis. A comparison with antimicrobial susceptibility data from 2000 to 2007 showed an increase in pleuromutilin resistance over time, doubling the number of isolates with decreased susceptibility to tiamulin. No alteration in susceptibility was detected for lincomycin, and the MIC of tylosin remained high (MIC(50) > 128 μg/ml). The decreased susceptibility to tylosin and lincomycin can be explained by mutations at position A2058 of the 23S rRNA gene (Escherichia coli numbering). A2058T was the predominant mutation, but A2058G also was found together with a change of the neighboring base pair at positions 2057 to 2611. The role of additional point mutations in the vicinity of the peptidyl transferase center and mutations in the L3 at amino acids 148 and 149 and their possible involvement in antimicrobial susceptibility are considered. An association between G2032A and high levels of tiamulin and lincomycin MICs was found, suggesting an increasing importance of this mutation in antimicrobial resistance of clinical isolates of B. hyodysenteriae.
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The use of quantitative PCR for identification and quantification of Brachyspira pilosicoli, Lawsonia intracellularis and Escherichia coli fimbrial types F4 and F18 in pig feces. Vet Microbiol 2011; 151:307-14. [PMID: 21530108 DOI: 10.1016/j.vetmic.2011.03.013] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Revised: 02/22/2011] [Accepted: 03/14/2011] [Indexed: 11/21/2022]
Abstract
Four quantitative PCR (qPCR) assays were evaluated for quantitative detection of Brachyspira pilosicoli, Lawsonia intracellularis, and E. coli fimbrial types F4 and F18 in pig feces. Standard curves were based on feces spiked with the respective reference strains. The detection limits from the spiking experiments were 10(2) bacteria/g feces for Bpilo-qPCR and Laws-qPCR, 10(3)CFU/g feces for F4-qPCR and F18-qPCR. The PCR efficiency for all four qPCR assays was between 0.91 and 1.01 with R(2) above 0.993. Standard curves, slopes and elevation, varied between assays and between measurements from pure DNA from reference strains and feces spiked with the respective strains. The linear ranges found for spiked fecal samples differed both from the linear ranges from pure culture of the reference strains and between the qPCR tests. The linear ranges were five log units for F4-qPCR, and Laws-qPCR, six log units for F18-qPCR and three log units for Bpilo-qPCR in spiked feces. When measured on pure DNA from the reference strains used in spiking experiments, the respective log ranges were: seven units for Bpilo-qPCR, Laws-qPCR and F18-qPCR and six log units for F4-qPCR. This shows the importance of using specific standard curves, where each pathogen is analysed in the same matrix as sample DNA. The qPCRs were compared to traditional bacteriological diagnostic methods and found to be more sensitive than cultivation for E. coli and B. pilosicoli. The qPCR assay for Lawsonia was also more sensitive than the earlier used method due to improvements in DNA extraction. In addition, as samples were not analysed for all four pathogen agents by traditional diagnostic methods, many samples were found positive for agents that were not expected on the basis of age and case history. The use of quantitative PCR tests for diagnosis of enteric diseases provides new possibilities for veterinary diagnostics. The parallel simultaneous analysis for several bacteria in multi-qPCR and the determination of the quantities of the infectious agents increases the information obtained from the samples and the chance for obtaining a relevant diagnosis.
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Backhans A, Johansson KE, Fellström C. Phenotypic and molecular characterization of Brachyspira spp. isolated from wild rodents. ENVIRONMENTAL MICROBIOLOGY REPORTS 2010; 2:720-727. [PMID: 23766276 DOI: 10.1111/j.1758-2229.2010.00165.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The occurrence of intestinal spirochaetes of genus Brachyspira in wild rodents was studied by cultivating 209 caecal samples. Spirochaetal cultures were obtained from 83% of rats and 33% of house mice. Biochemical characterization and six different species-specific PCR methods were applied to 101 of 118 isolates and a selection of 34 brachyspiras were further studied by sequencing of the 16S rRNA gene. The results showed that isolates representing all the established biochemical phenotypes could be cultured from the rodents, including the porcine pathogens Brachyspira hyodysenteriae and Brachyspira pilosicoli. Phylogenetic studies indicated that rodents carry Brachyspira spp. that are closely related to porcine and avian isolates, as well as variants previously not described. One group of hippurate-negative rat isolates were shown to possess the 16S rRNA gene hexa(T) nucleotide segment, previously described only in B. pilosicoli and 'Brachyspira corvi', and phylogenetically they formed a sister lineage of the B. pilosicoli cluster. Furthermore, a large number of the rodents were colonized by slowly growing, non- or weakly haemolytic spirochaetes. Most of these brachyspiras were isolated at 37°C and phylogenetically they formed two separate clusters. Sequence analysis of their 16S rRNA genes indicated that the new variants of Brachyspira spp. may constitute novel species of the genus Brachyspira.
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Affiliation(s)
- Annette Backhans
- Departments of Clinical Sciences and Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, Uppsala, Sweden. National Veterinary Institute, Department of Bacteriology, Uppsala, Sweden
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Reiner G, Winkelmann M, Willems H. Prevalence of Lawsonia intracellularis, Brachyspira hyodysenteriae, and Brachyspira pilosicoli infection in hunted wild boars (Sus scrofa) in Germany. EUR J WILDLIFE RES 2010. [DOI: 10.1007/s10344-010-0451-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Characterization and epidemiological relationships of Spanish Brachyspira hyodysenteriae field isolates. Epidemiol Infect 2009; 138:76-85. [PMID: 19480724 DOI: 10.1017/s0950268809002817] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
This research aimed to describe the genetic and phenotypic diversity of 74 Spanish Brachyspira hyodysenteriae field isolates, to establish epidemiological relationships between the isolates and to confirm the presence of tiamulin-resistant isolates in Spain. For these purposes, we performed biochemical tests in combination with diagnostic PCR analysis for the identification of Brachyspira spp. and for detection of the smpA/smpB gene. We also used antimicrobial susceptibility tests, random amplified polymorphic DNA (RAPD) and a new pulsed-field gel electrophoresis (PFGE) protocol. The combination of RAPD and PFGE allowed the study of epidemiological relationships. Both indole-negative and tiamulin-resistant isolates of B. hyodysenteriae are reported in Spain for the first time. The genetic analyses indicated a relationship between these Spanish isolates and indole-negative isolates previously obtained from Germany and Belgium.
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Song Y, Hampson DJ. Development of a multiplex qPCR for detection and quantitation of pathogenic intestinal spirochaetes in the faeces of pigs and chickens. Vet Microbiol 2009; 137:129-36. [DOI: 10.1016/j.vetmic.2008.12.020] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2008] [Revised: 12/15/2008] [Accepted: 12/17/2008] [Indexed: 11/30/2022]
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Intestinal spirochetes isolated from wild-living jackdaws, hooded crows and rooks (genus Corvus): provisionally designated "Brachyspira corvi" sp. nov. Anaerobe 2008; 14:287-95. [PMID: 18952187 DOI: 10.1016/j.anaerobe.2008.09.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2008] [Revised: 08/28/2008] [Accepted: 09/18/2008] [Indexed: 11/21/2022]
Abstract
Intestinal spirochetes of genus Brachyspira are commonly isolated from mammalian and avian hosts, and several species have been reported to cause enteric disease in pigs and birds. Except for a previous publication on three isolates from corvid birds (order Passeriformes, family Corvidae, genus Corvus), of which two are further studied in this paper, no other reports exist on Brachyspira spp. of passerine birds. In this study, cloacal and intestinal swabs of small and large intestines were collected from 116 corvid birds of three species, i.e. jackdaws (Corvus monedula), hooded crows (Corvus corone cornix) and rooks (Corvus frugilegus), from four separate geographical locations in Sweden. Isolates were obtained by selective culture from 43 of 116 birds. All isolates were weakly hemolytic, indole-negative and lacked hippurate cleavage capacity. Examination by light microscopy did not indicate association with enteric disease in necropsied birds. Pure spirochete cultures were obtained by serial dilution and subculture, and selected isolates were analyzed by PCR (n=14), randomly amplified polymorphic DNA (RAPD) (n=14), and sequencing of the almost complete 16S rRNA (n=14), and partial nox genes (n=4). Positive reactions were noticed by PCR targeting a hexa-T segment of the 16S rRNA gene, which has been previously reported as a signature characteristic of Brachyspira pilosicoli. By 16S rRNA gene sequencing, the isolates formed a separate cluster related to genus Brachyspira, but not consistent with any presently recognized or proposed Brachyspira sp. The sequence similarity of the 16S rRNA gene among the isolates from corvid birds was 99.7-100%. Compared to 16S rRNA gene sequence data from all presently recognized and several proposed Brachyspira spp. the sequence similarity of the isolates from corvid birds varied between 94.1 and 96.5%. In a radial tree based on nox gene sequences, all four analyzed isolates from corvid birds formed a separate cluster. By RAPD analysis, the banding patterns of the isolates differed from all type strains of Brachyspira spp. Based on the results presented in this paper, we propose that the described isolates from corvid birds belong to a novel species within genus Brachyspira, with the provisional name "Brachyspira corvi" (cor'vi. L gen. n. corvi, of a crow).
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Feberwee A, Hampson DJ, Phillips ND, La T, van der Heijden HMJF, Wellenberg GJ, Dwars RM, Landman WJM. Identification of Brachyspira hyodysenteriae and other pathogenic Brachyspira species in chickens from laying flocks with diarrhea or reduced production or both. J Clin Microbiol 2008; 46:593-600. [PMID: 18077642 PMCID: PMC2238072 DOI: 10.1128/jcm.01829-07] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2007] [Revised: 11/20/2007] [Accepted: 11/28/2007] [Indexed: 11/20/2022] Open
Abstract
Cecal samples from laying chickens from 25 farms with a history of decreased egg production, diarrhea, and/or increased feed conversion ratios were examined for anaerobic intestinal spirochetes of the genus Brachyspira. Seventy-three samples positive in an immunofluorescence assay for Brachyspira species were further examined using selective anaerobic culture, followed by phenotypic analysis, species-specific PCRs (for Brachyspira hyodysenteriae, B. intermedia, and B. pilosicoli), and a Brachyspira genus-specific PCR with sequencing of the partial 16S rRNA gene products. Brachyspira cultures were obtained from all samples. Less than half of the isolates could be identified to the species level on the basis of their biochemical phenotypes, while all but four isolates (5.2%) were speciated by using PCR and sequencing of DNA extracted from the bacteria. Different Brachyspira spp. were found within a single flock and also in cultures from single chickens, emphasizing the need to obtain multiple samples when investigating outbreaks of avian intestinal spirochetosis. The most commonly detected spirochetes were the pathogenic species B. intermedia and B. pilosicoli. The presumed nonpathogenic species B. innocens, B. murdochii, and the proposed "B. pulli" also were identified. Pathogenic B. alvinipulli was present in two flocks, and this is the first confirmed report of B. alvinipulli in chickens outside the United States. Brachyspira hyodysenteriae, the agent of swine dysentery, also was identified in samples from three flocks. This is the first confirmed report of natural infection of chickens with B. hyodysenteriae. Experimental infection studies are required to assess the pathogenic potential of these B. hyodysenteriae isolates.
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Affiliation(s)
- Anneke Feberwee
- Animal Health Service (GD), PO Box 9, 7400 AA Deventer, The Netherlands.
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Råsbäck T, Johansson KE, Jansson DS, Fellström C, Alikhani MY, La T, Dunn DS, Hampson DJ. Development of a multilocus sequence typing scheme for intestinal spirochaetes within the genus Brachyspira. Microbiology (Reading) 2007; 153:4074-4087. [DOI: 10.1099/mic.0.2007/008540-0] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- T. Råsbäck
- Department of Clinical Sciences, Swedish University of Agricultural Sciences (SLU), PO Box 7018, SE-750 07 Uppsala, Sweden
- Department of Bacteriology, National Veterinary Institute (SVA), SE-751 89 Uppsala, Sweden
| | - K.-E. Johansson
- Department of Biomedical Sciences and Veterinary Public Health, PO Box 7009, Swedish University of Agricultural Sciences (SLU), SE-750 07 Uppsala, Sweden
- Department of Bacteriology, National Veterinary Institute (SVA), SE-751 89 Uppsala, Sweden
| | - D. S. Jansson
- Department of Pigs, Poultry and Ruminants, National Veterinary Institute (SVA), SE-751 89 Uppsala, Sweden
- Department of Clinical Sciences, Swedish University of Agricultural Sciences (SLU), PO Box 7018, SE-750 07 Uppsala, Sweden
| | - C. Fellström
- Department of Clinical Sciences, Swedish University of Agricultural Sciences (SLU), PO Box 7018, SE-750 07 Uppsala, Sweden
| | - M. Y. Alikhani
- School of Veterinary and Biomedical Sciences, Murdoch University, Murdoch 6150, Australia
- Department of Microbiology, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - T. La
- School of Veterinary and Biomedical Sciences, Murdoch University, Murdoch 6150, Australia
| | - D. S. Dunn
- Centre for Comparative Genomics, Murdoch University, Murdoch 6150, Australia
| | - D. J. Hampson
- School of Veterinary and Biomedical Sciences, Murdoch University, Murdoch 6150, Australia
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Nathues H, Oliveira CJB, Wurm M, Grosse Beilage E, Givisiez PEN. Simultaneous Detection of Brachyspira hyodysenteriae, Brachyspira pilosicoli and Lawsonia intracellularis in Porcine Faeces and Tissue Samples by Multiplex-PCR. ACTA ACUST UNITED AC 2007; 54:532-8. [DOI: 10.1111/j.1439-0442.2007.00995.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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