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Andino-Molina M, Dost I, Abdel-Glil M, Pletz MW, Neubauer H, Seyboldt C. Antimicrobial resistance of Clostridioides difficile in veterinary medicine around the world: A scoping review of minimum inhibitory concentrations. One Health 2024; 19:100860. [PMID: 39157654 PMCID: PMC11327573 DOI: 10.1016/j.onehlt.2024.100860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Revised: 07/16/2024] [Accepted: 07/16/2024] [Indexed: 08/20/2024] Open
Abstract
Objective To provide a comprehensive characterization of Clostridioides difficile antimicrobial resistance (AMR) data in veterinary medicine based on the minimum inhibitory concentrations (MICs) of all antimicrobial agents tested in relation to the techniques used. Methods A systematic scoping review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) extension for scoping reviews (PRISMA-ScR) and its associated checklist. The objective was to provide a synthesis of the evidence in a summarized and analyzed format.To this end, three scientific databases were consulted: Scopus, PubMed, and Web of Science, up until December 2021. Subsequently, all identified literature was subjected to screening and classification in accordance with the established study criteria, with the objective of subsequent evaluation. Study selection and data extraction A comprehensive analysis was conducted on studies regarding Clostridioides difficile antimicrobial resistance (AMR) in veterinary medicine across various animal species and related sources. The analysis included studies that presented data on antimicrobial susceptibility testing using the E-test, agar dilution, or broth microdilution techniques. The extracted data included minimum inhibitory concentration (MIC) values and a comprehensive characterization analysis. Results A total of 1582 studies were identified in scientific databases, of which only 80 were subjected to analysis. The research on Clostridioides difficile antimicrobial resistance (AMR) in veterinary medicine is most prolific in Europe and North America. The majority of isolates originate from production animals (55%) and pets (15%), with pigs, horses, and cattle being the most commonly studied species. The tested agents' minimum inhibitory concentrations (MICs) and resulting putative antimicrobial resistance profiles exhibited considerable diversity across animal species and sources of isolation. Additionally, AMR characterization has been conducted at the gene and genomic level in animal strains. The E-test was the most frequently utilized method for antimicrobial susceptibility testing (AST). Furthermore, the breakpoints for interpreting the MICs were found to be highly heterogeneous and frequently observed regardless of the geographical origin of the publication. Conclusions Antimicrobial susceptibility testing techniques and results were found to be diverse and heterogeneous. There is no evidence of an exclusive antimicrobial resistance pattern in any animal species. Despite the phenotypic and genomic data collected over the years, further interdisciplinary studies are necessary. Our findings underscore the necessity for international collaboration to establish uniform standards for C. difficile antimicrobial susceptibility testing (AST) methods and reporting. Such collaboration would facilitate a "One Health" approach to surveillance and control, which is of paramount importance.
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Affiliation(s)
- Mauricio Andino-Molina
- Grupo de Investigación en Enfermedades de Etiología Microbiana (GIEEM) & Observatorio Universitario de Genómica y Resistencia Antimicrobiana (OUGRAM), Instituto de Investigaciones en Microbiología (IIM), Escuela de Microbiología, Facultad de Ciencias, Universidad Nacional Autónoma de Honduras, Honduras
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena, Germany
- Institute for Infectious Diseases and Infection Control, Jena University Hospital, Jena, Germany
| | - Ines Dost
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena, Germany
- Landesuntersuchungsamt Rheinland-Pfalz, Koblenz, Germany
| | - Mostafa Abdel-Glil
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena, Germany
| | - Mathias W. Pletz
- Institute for Infectious Diseases and Infection Control, Jena University Hospital, Jena, Germany
| | - Heinrich Neubauer
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena, Germany
| | - Christian Seyboldt
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena, Germany
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Gomez DE, Arroyo LG, Schoster A, Renaud DL, Kopper JJ, Dunkel B, Byrne D, Toribio RE. Diagnostic approaches, aetiological agents and their associations with short-term survival and laminitis in horses with acute diarrhoea admitted to referral institutions. Equine Vet J 2024; 56:959-969. [PMID: 37984355 DOI: 10.1111/evj.14024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 10/02/2023] [Indexed: 11/22/2023]
Abstract
BACKGROUND An international description of the diagnostic approaches used in different institutions to diagnose acute equine diarrhoea and the pathogens detected is lacking. OBJECTIVES To describe the diagnostic approach, aetiological agents, outcome, and development of laminitis for diarrhoeic horses worldwide. STUDY DESIGN Multicentre retrospective case series. METHODS Information from horses with acute diarrhoea presenting to participating institutions between 2016 and 2020, including diagnostic approaches, pathogens detected and their associations with outcomes, were compared between institutions or geographic regions. RESULTS One thousand four hundred and thirty-eight horses from 26 participating institutions from 4 continents were included. Overall, aetiological testing was limited (44% for Salmonella spp., 42% for Neorickettsia risticii [only North America], 40% for Clostridiodes difficile, and 29% for ECoV); however, 13% (81/633) of horses tested positive for Salmonella, 13% (35/262) for N. risticii, 9% (37/422) for ECoV, and 5% (27/578) for C. difficile. C. difficile positive cases had greater odds of non-survival than horses negative for C. difficile (OR: 2.69, 95%CI: 1.23-5.91). In addition, horses that were positive for N. risticii had greater odds of developing laminitis than negative horses (OR: 2.76, 95%CI: 1.12-6.81; p = 0.029). MAIN LIMITATIONS Due to the study's retrospective nature, there are missing data. CONCLUSIONS This study highlighted limited diagnostic investigations in cases of acute equine diarrhoea. Detection rates of pathogens are similar to previous reports. Non-survival and development of laminitis are related to certain detected pathogens.
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Affiliation(s)
- Diego E Gomez
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - Luis G Arroyo
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - Angelika Schoster
- Vetsuisse Faculty, Equine Department University of Zurich, Zurich, Switzerland
- Ludwig-Maximilians-University Munich, Equine Clinic, Oberschleissheim, Germany
| | - David L Renaud
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - Jamie J Kopper
- Department of Veterinary Clinical Sciences, Iowa State University College of Veterinary Medicine, Ames, Iowa, USA
| | - Bettina Dunkel
- Department of Clinical Science and Services, The Royal Veterinary College, Hertfordshire, UK
| | - David Byrne
- College of Veterinary Medicine, Murdoch University, Perth, Western Australia, Australia
| | - Ramiro E Toribio
- College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, USA
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Gomez D, Toribio R, Caddey B, Costa M, Vijan S, Dembek K. Longitudinal effects of oral administration of antimicrobial drugs on fecal microbiota of horses. J Vet Intern Med 2023; 37:2562-2572. [PMID: 37681574 PMCID: PMC10658497 DOI: 10.1111/jvim.16853] [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: 03/23/2023] [Accepted: 08/23/2023] [Indexed: 09/09/2023] Open
Abstract
BACKGROUND Antimicrobial drug-associated diarrhea (AAD) is the most common adverse effect in horses receiving antimicrobials. Little information on how oral administration of antimicrobials alters intestinal microbiota in horses is available. OBJECTIVE Investigate changes of the fecal microbiota in response to oral administration of antimicrobials. ANIMALS Twenty healthy horses. METHODS Prospective, longitudinal study. Horses were randomly assigned to 4 groups comprising 4 horses each: group 1 (metronidazole); group 2 (erythromycin); group 3 (doxycycline); group 4 (sulfadiazine/trimethoprim, SMZ-TMP); and group 5 (control). Antimicrobials were administered for 5 days. Fecal samples were obtained before (day 0) and at 1, 2, 3, 4, 5, 6, and 30 days of the study period. Fecal microbiota was characterized by high throughput sequencing of the V4 region of the 16S rRNA. RESULTS Horses remained healthy throughout the study. Richness and diversity in doxycycline, erythromycin, and metronidazole, but not SMZ-TMP groups, was significantly lower (P < .05) at multiple time points after administration of antimicrobials compared with samples from day 0. Main changes in the microbiota were observed during the time of antimicrobial administration (day 2-5; weighted and unweighted UniFrac PERMANOVA P < .05). Administration of erythromycin, doxycycline and, to a lesser extent, metronidazole produced a pronounced alteration in the microbiota compared with day 0 samples by decreasing the abundance of Treponema, Fibrobacter, and Lachnospiraceae and increasing Fusobacterium and Escherichia-Shigella. CONCLUSIONS AND CLINICAL IMPORTANCE Oral administration of antimicrobials alters the intestinal microbiota of healthy horses resembling horses with dysbiosis, potentially resulting in intestinal inflammation and predisposition to diarrhea.
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Affiliation(s)
- Diego Gomez
- Department of Clinical Studies, Ontario Veterinary CollegeUniversity of GuelphGuelphOntarioCanada
| | - Ramiro Toribio
- Department of Clinical SciencesThe Ohio State University, College of Veterinary MedicineColumbusOhioUSA
| | - Benjamin Caddey
- Faculty of Veterinary MedicineUniversity of CalgaryCalgaryAlbertaCanada
| | - Marcio Costa
- Faculté de Médecine Vétérinaire – Département de Biomédecine VétérinaireUniversity of MontrealSaint‐HyacintheQuebecCanada
| | - Stephanie Vijan
- Department of Clinical SciencesThe Ohio State University, College of Veterinary MedicineColumbusOhioUSA
| | - Katarzyna Dembek
- Department of Clinical Sciences, College of Veterinary MedicineNorth Carolina State UniversityRaleighNorth CarolinaUSA
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Sanclemente JL, Rivera-Velez SM, Horohov DW, Dasgupta N, Sanz MG. Plasma metabolome of healthy and Rhodococcus equi-infected foals over time. Equine Vet J 2023; 55:831-842. [PMID: 36273247 DOI: 10.1111/evj.13894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 09/25/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND Foals that develop pulmonary ultrasonographic lesions on Rhodococcus equi (R. equi) endemic farms are treated with antibiotics because those at risk of developing clinical pneumonia (~20%) cannot be recognised early. Candidate biomarkers identified using metabolomics may aid targeted treatment strategies against R. equi. OBJECTIVES (1) To describe how foal ageing affects their plasma metabolome (birth to 8 weeks) and (2) to establish the effects that experimental infection with Rhodococcus equi (R. equi) has on foal metabolome. STUDY DESIGN Experimental study. METHODS Nine healthy newborn foals were experimentally infected with R. equi as described in a previous study. Foals were treated with oral antibiotics if they developed clinical pneumonia (n = 4, clinical group) or remained untreated if they showed no signs of disease (n = 5, subclinical group). A group of unchallenged foals (n = 4) was also included in the study. By the end of the study period (8 weeks), all foals were free of disease. This status was confirmed with transtracheal wash fluid evaluation and culture as well as thoracic ultrasonography. Plasma metabolomics was determined by GC-MS weekly for the study duration (8 weeks). RESULTS Foals' plasma metabolome was altered by ageing (birth to 8 weeks) and experimental infection with R. equi as demonstrated using multivariate statistical analysis. The intensities of 25 and 28 metabolites were altered by ageing and infection (p < 0.05) respectively. Furthermore, 20 metabolites changed by more than 2-fold between clinical and subclinical groups. MAIN LIMITATIONS The number of foals is limited. Foals were experimentally infected with R. equi. CONCLUSIONS Ageing and R. equi infection induced changes in the plasma metabolome of foals. These results provide an initial description of foal's plasma metabolome and serve as background for future identification of R. equi pneumonia biomarkers.
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Affiliation(s)
- Jorge L Sanclemente
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington, USA
| | - Sol M Rivera-Velez
- Molecular Determinants Core, Johns Hopkins All Children's Hospital, St Petersburg, Florida, USA
| | - David W Horohov
- Maxwell H. Gluck Equine Research Center, Department of Veterinary Clinical Sciences, University of Kentucky, Lexington, Kentucky, USA
| | - Nairanjana Dasgupta
- Department of Mathematics and Statistics, College of Arts and Sciences, Washington State University, Pullman, Washington, USA
| | - Macarena G Sanz
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington, USA
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Sanz MG. Rhodococcus equi-What is New This Decade? Vet Clin North Am Equine Pract 2023; 39:1-14. [PMID: 36898784 DOI: 10.1016/j.cveq.2022.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023] Open
Abstract
Foals become infected shortly after birth; most develop subclinical pneumonia and 20% to 30% develop clinical pneumonia that requires treatment. It is now well established that the combination of screening programs based on thoracic ultrasonography and treatment of subclinical foals with antimicrobials has led to the development of resistant Rhodococcus equi strains. Thus, targeted treatment programs are needed. Administration of R equi-specific hyperimmune plasma shortly after birth is beneficial as foals develop less severe pneumonia but does not seem to prevent infection. This article provides a summary of clinically relevant research published during this past decade.
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Onzere CK, Hulbert M, Sears KP, Williams LBA, Fry LM. Tulathromycin and Diclazuril Lack Efficacy against Theileria haneyi, but Tulathromycin Is Not Associated with Adverse Clinical Effects in Six Treated Adult Horses. Pathogens 2023; 12:pathogens12030453. [PMID: 36986375 PMCID: PMC10055745 DOI: 10.3390/pathogens12030453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 02/28/2023] [Accepted: 03/10/2023] [Indexed: 03/16/2023] Open
Abstract
Equine theileriosis, caused by Theileria haneyi and Theileria equi, leads to anemia, exercise intolerance, and occasionally, death. Theileriosis-free countries prohibit the importation of infected horses, resulting in significant costs for the equine industry. Imidocarb dipropionate is the only treatment for T. equi in the United States, but lacks efficacy against T. haneyi. The goal of this study was to assess the in vivo efficacy of tulathromycin and diclazuril against T. haneyi. Fourteen T. haneyi-infected horses were utilized. Six were treated with eight weekly 2.5 mg/kg doses of tulathromycin. Three were treated daily for eight weeks with 2.5 mg/kg diclazuril. Three were pre-treated with 0.5 mg/kg diclazuril daily for one month to determine whether low-dose diclazuril prevents infection. Following infection, the dose was increased to 2.5 mg/kg for eight weeks. Two infected horses remained untreated as controls. The horses were assessed via nested PCR, physical exams, complete blood counts, serum chemistry panels, and cytology. Tulathromycin and diclazuril failed to clear T. haneyi and the treated and control groups exhibited similar parasitemia and packed cell volume declines. To obtain additional safety data on tulathromycin use in adult horses, necropsy and histopathology were performed on tulathromycin-treated horses. No significant lesions were detected.
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Affiliation(s)
- Cynthia K. Onzere
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA
| | - Morgan Hulbert
- College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
| | - Kelly P. Sears
- Department of Clinical Science, Carlson College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, USA
| | - Laura B. A. Williams
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA
| | - Lindsay M. Fry
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA
- Animal Disease Research Unit, USDA-ARS, Pullman, WA 99164, USA
- Correspondence:
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7
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Lee YR, Lee K, Byun JW, Kim H, So B, Ku BK, Kim HY, Moon BY. Prevalence, genetic characteristics, and antimicrobial resistance of Clostridioides difficile isolates from horses in Korea. Anaerobe 2023; 80:102700. [PMID: 36716814 DOI: 10.1016/j.anaerobe.2023.102700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 01/15/2023] [Accepted: 01/20/2023] [Indexed: 01/28/2023]
Abstract
OBJECTIVES Clostridioides difficile is an etiological agent of enteric diseases in humans and animals. Animals are considered a potential reservoir due to the genetic and antimicrobial resistance similarities between human and animal C. difficile isolates. In this study, we evaluated the genetic characteristics and antimicrobial resistance profiles of C. difficile isolated from 942 fecal samples collected from horses in South Korea during 2019-2020. METHODS The C. difficile isolates were tested for toxin genes including tcdA (A), tcdB (B), and cdtAB (CDT) and deletions of the tcdC gene by PCR. In addition, ribotyping, multilocus sequence typing, and antimicrobial susceptibility tests were performed. RESULTS Twenty-three (2.4%) C. difficile isolates were associated with diarrhea in foals under 1 year old during the spring-summer period. Of these, 82.6% were toxigenic strains, determined to be A+B+CDT+ (52.1%) or A+B+CDT‒ (30.4%). All isolates were susceptible to metronidazole and vancomycin, and resistant to cefotaxime and gentamicin, and 76.2% were multidrug resistant (MDR). RT078/ST11/Clade 5 was the most common genotype (47.8%), which was also found in animals and humans worldwide. All RT078/ST11/Clade 5 strains were toxigenic and had deletions of the tcdC gene. About half of these strains were resistant to moxifloxacin, and 63.6% were MDR. CONCLUSIONS C. difficile isolates in this study consisted mostly of toxigenic and MDR strains, and their genetic properties were highly similar to human C. difficile isolates. These results suggest high possibilities of zoonotic transmission and can provide knowledge for establishing strategies for the treatment and prevention of C. difficile infection.
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Affiliation(s)
- Yu-Ran Lee
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, 39660, Republic of Korea.
| | - Kichan Lee
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, 39660, Republic of Korea.
| | - Jae-Won Byun
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, 39660, Republic of Korea.
| | - Heejung Kim
- Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea.
| | - ByungJae So
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, 39660, Republic of Korea.
| | - Bok-Kyung Ku
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, 39660, Republic of Korea.
| | - Ha-Young Kim
- Bacterial Disease Division, Animal and Plant Quarantine Agency, Gimcheon, 39660, Republic of Korea.
| | - Bo-Youn Moon
- Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, 39660, Republic of Korea.
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Durie I, Galen GV. Can the use of antimicrobials in adult equine patients with acute colitis be justified in the era of antimicrobial stewardship? EQUINE VET EDUC 2022. [DOI: 10.1111/eve.13657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Inge Durie
- Evidensia Specialisthästsjukhuset Strömsholm Strömsholm Sweden
| | - Gaby van Galen
- University of Sydney School of Veterinary Science University of Sydney Sydney New South Wales Australia
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Liepman RS, Swink JM, Habing GG, Boyaka PN, Caddey B, Costa M, Gomez DE, Toribio RE. Effects of Intravenous Antimicrobial Drugs on the Equine Fecal Microbiome. Animals (Basel) 2022; 12:1013. [PMID: 35454258 PMCID: PMC9030835 DOI: 10.3390/ani12081013] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 03/30/2022] [Accepted: 04/07/2022] [Indexed: 02/05/2023] Open
Abstract
Alterations in the gastrointestinal microbiota after antimicrobial therapy in horses can result in loss of colonization resistance and changes in bacterial metabolic function. It is hypothesized that these changes facilitate gastrointestinal inflammation, pathogen expansion and the development of diarrhea. The objectives of this study were to determine the effect of intravenous administration of antimicrobial drugs (ceftiofur, enrofloxacin, oxytetracycline) on equine fecal bacterial communities over time, to investigate whether those changes are detectable after 5 days of treatment and whether they persist over time (30 days). Sixteen horses were randomly assigned into 4 treatment groups: group 1 (enrofloxacin, n = 4); group 2 (ceftiofur sodium, n = 4); group 3 (oxytetracycline, n = 4); group 4 (0.9% saline solution, placebo, n = 4). Antimicrobial therapy was administered for 5 days. Fecal samples were obtained before (day 0) and at 3, 5 and 30 days of the study period. Bacterial DNA was amplified using specific primers to the hypervariable region V1−V3 of the 16S rRNA gene using a 454 FLX-Titanium pyrosequencer. Antimicrobial therapy failed to cause any changes in physical examination parameters, behavior, appetite or fecal output or consistency throughout the study in any horse. There was a significant effect of treatment on alpha diversity indices (richness) over the treatment interval for ceftiofur on days 0 vs. 3 (p < 0.05), but not for other antimicrobials (p > 0.05). Microbial composition was significantly different (p < 0.05) across treatment group and day, but not for interactions between treatment and day, regardless of taxonomic level and beta-diversity distance metric. The most significant antimicrobial effects on relative abundance were noted after intravenous administration of ceftiofur and enrofloxacin. The relative abundance of Fibrobacteres was markedly lower on day 3 compared to other days in the ceftiofur and enrofloxacin treatment groups. There was an increase in Clostridia and Lachnospiraceae from day 0 to days 3 and 5 in ceftiofur and enrofloxacin treated groups. These findings showed the negative effect of antimicrobial drugs on bacterial communities associated with gut health (Fibrobacteres and Lachnospiraceae) and indicate that changes in specific taxa could predispose horses to gastrointestinal inflammation and the development of diarrhea.
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Affiliation(s)
- Rachel S. Liepman
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA; (R.S.L.); (J.M.S.)
| | - Jacob M. Swink
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA; (R.S.L.); (J.M.S.)
| | - Greg G. Habing
- Department of Preventive Medicine, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA;
| | - Prosper N. Boyaka
- Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA;
| | - Benjamin Caddey
- Department of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada;
| | - Marcio Costa
- Department of Veterinary Biomedical Sciences, Faculté de Médecine Vétérinaire, University of Montreal, Saint Hyacinthe, QC J2S 2M2, Canada;
| | - Diego E. Gomez
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada;
| | - Ramiro E. Toribio
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA; (R.S.L.); (J.M.S.)
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10
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Bordin AI, Huber L, Sanz M, Cohen N. Rhodococcus equi Foal Pneumonia: Update on Epidemiology, Immunity, Treatment, and Prevention. Equine Vet J 2022; 54:481-494. [PMID: 35188690 DOI: 10.1111/evj.13567] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 02/03/2022] [Accepted: 02/17/2022] [Indexed: 11/25/2022]
Abstract
Pneumonia in foals caused by the bacterium Rhodococcus equi has a worldwide distribution and is a common cause of disease and death for foals. The purpose of this narrative review is to summarise recent developments pertaining to the epidemiology, immune responses, treatment, and prevention of rhodococcal pneumonia of foals. Screening tests have been used to implement earlier detection and treatment of foals with presumed subclinical R. equi pneumonia to reduce mortality and severity of disease. Unfortunately, this practice has been linked to the emergence of antimicrobial resistant R. equi in North America. Correlates of protective immunity for R. equi infections of foals remain elusive, but recent evidence indicates that innate immune responses are important both for mediating killing and orchestrating adaptive immune responses. A macrolide antimicrobial in combination with rifampin remains the recommended treatment for foals with R. equi pneumonia. Great need exists to identify which antimicrobial combination is most effective for treating foals with R. equi pneumonia and to limit emergence of antimicrobial-resistant strains. In the absence of an effective vaccine against R. equi, passive immunisation remains the only commercially-available method for effectively reducing the incidence of R. equi pneumonia. Because passive immunisation is expensive, labour-intensive, and carries risks for foals, great need exists to develop alternative approaches for passive and active immunisation.
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Affiliation(s)
- Angela I Bordin
- Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, 77843-4475, USA
| | - Laura Huber
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, 36849, USA
| | - Macarena Sanz
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington, 99164-6610, USA
| | - Noah Cohen
- Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, 77843-4475, USA
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Hain‐Saunders N, Knight DR, Bruce M, Riley TV. Clostridioides difficile
infection and One Health: An Equine Perspective. Environ Microbiol 2022; 24:985-997. [PMID: 35001483 PMCID: PMC9304292 DOI: 10.1111/1462-2920.15898] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 01/04/2022] [Accepted: 01/05/2022] [Indexed: 11/29/2022]
Abstract
Clostridioides (Clostridium) difficile presents a significant health risk to humans and animals. The complexity of the bacterial–host interaction affecting pathogenesis and disease development creates an ongoing challenge for epidemiological studies, control strategies and prevention planning. The recent emergence of human disease caused by strains of C. difficile found in animals adds to mounting evidence that C. difficile infection (CDI) may be a zoonosis. In equine populations, C. difficile is a known cause of diarrhoea and gastrointestinal inflammation, with considerable mortality and morbidity. This has a significant impact on both the well‐being of the animal and, in the case of performance and production animals, it may have an adverse economic impact on relevant industries. While C. difficile is regularly isolated from horses, many questions remain regarding the impact of asymptomatic carriage as well as optimization of diagnosis, testing and treatment. This review provides an overview of our understanding of equine CDI while also identifying knowledge gaps and the need for a holistic One Health approach to a complicated issue.
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Affiliation(s)
- Natasza Hain‐Saunders
- Biosecurity and One Health Research Centre, Harry Butler Institute Murdoch University Murdoch Western Australia Australia
| | - Daniel R. Knight
- Biosecurity and One Health Research Centre, Harry Butler Institute Murdoch University Murdoch Western Australia Australia
- School of Biomedical Sciences, The University of Western Australia, Queen Elizabeth II Medical Centre Nedlands 6009 WA Australia
| | - Mieghan Bruce
- School of Veterinary Medicine, Centre for Biosecurity and One Health Murdoch University Murdoch Western Australia Australia
| | - Thomas V. Riley
- Biosecurity and One Health Research Centre, Harry Butler Institute Murdoch University Murdoch Western Australia Australia
- School of Biomedical Sciences, The University of Western Australia, Queen Elizabeth II Medical Centre Nedlands 6009 WA Australia
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia Australia
- Department of Microbiology, PathWest Laboratory Medicine, Queen Elizabeth II Medical Centre Nedlands Western Australia Australia
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12
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Kopper JJ, Willette JA, Kogan CJ, Seguin A, Bolin SR, Schott HC. Detection of pathogens in blood or feces of adult horses with enteric disease and association with outcome of colitis. J Vet Intern Med 2021; 35:2465-2472. [PMID: 34382708 PMCID: PMC8478065 DOI: 10.1111/jvim.16238] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 07/17/2021] [Accepted: 07/26/2021] [Indexed: 11/28/2022] Open
Abstract
Background Rates of detecting ≥1 potential enteric pathogens (PEP) or toxins (PEP‐T) in feces, blood, or both of horses ≥6 months of age with enteric disease and impact of multiple detections on outcome of horses with colitis has not been reported. Objective To determine detection rates of PEP/PEP‐T in feces, blood, or both of horses with enteric disease and effect of detecting multiple agents on outcome of horses with colitis. Animals Thirty‐seven hundred fifty‐three fecal samples submitted to IDEXX Laboratories and 239 fecal and blood samples submitted to Michigan State University's Veterinary Diagnostic Laboratory (MSUVDL). Methods Retrospective evaluation of PEP/PEP‐T testing results was performed to determine rates of detection of 1 or more PEP/PEP‐T. Impact of detecting multiple agents on outcome was assessed in 239 horses hospitalized for colitis. Results One or more PEP/PEP‐T was detected in 1175/3753 (31.3%) and 145/239 (60.7%) of samples submitted to IDEXX Laboratories and MSUVDL, respectively. In a hospitalized cohort, survival to discharge was lower (76%) in horses with 1 agent, compared to horses with either no (88%) or multiple (89%) agents. There was no difference (P = .78) in days of hospitalization between horses with 0 (1–17), 1 (1–33), and > 1 positive (1–20) result. There was no difference in cost of hospitalization (P = .25) between horses with 0 ($2357, $1110‐15 553), 1 ($2742, $788‐11 005), and >1 positive ($2560, $1091‐10 895) result. Conclusions and Clinical Importance Detection rates of PEP/PEP‐T in horses with colitis vary with cohorts and tests performed. Detection of more than 1 PEP or PEP‐T did not affect outcome.
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Affiliation(s)
- Jamie J Kopper
- Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, Michigan, USA
| | - Jaclyn A Willette
- Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, Michigan, USA
| | - Clark J Kogan
- Department of Mathematics and Statistics, Washington State University, Pullman, Washington, USA
| | - Alexis Seguin
- IDEXX Laboratories, Inc, Westbrook, Massachusetts, USA
| | - Steven R Bolin
- Department of Pathobiology and Diagnostic Investigation, Michigan State University, East Lansing, Michigan, USA
| | - Harold C Schott
- Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, Michigan, USA
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13
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Floyd EF, Easton‐Jones CA, Theelen MJP. Systemic antimicrobial therapy in foals. EQUINE VET EDUC 2021. [DOI: 10.1111/eve.13467] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- E. F. Floyd
- Rossdales Equine Hospital Newmarket, Suffolk UK
| | | | - M. J. P. Theelen
- Department of Clinical Sciences (Equine Internal Medicine) Faculty of Veterinary Medicine Utrecht University UtrechtThe Netherlands
- Department of Biomolecular Health Sciences (Clinical Infectiology) Faculty of Veterinary Medicine Utrecht University Utrecht The Netherlands
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14
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Isgren CM, Williams NJ, Fletcher OD, Timofte D, Newton RJ, Maddox TW, Clegg PD, Pinchbeck GL. Antimicrobial resistance in clinical bacterial isolates from horses in the UK. Equine Vet J 2021; 54:390-414. [PMID: 33566383 DOI: 10.1111/evj.13437] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 01/05/2021] [Accepted: 02/03/2021] [Indexed: 12/29/2022]
Abstract
BACKGROUND Surveillance of antimicrobial resistance (AMR) in horses is important to aid empirical treatment decisions and highlight emerging AMR threats. OBJECTIVE To describe the AMR patterns of common groups of bacteria from clinical submissions from horses in the UK during 2018, and to determine how this varies by sample site and type of submitting veterinary practice. STUDY DESIGN Prospective observational study. METHODS All data on bacterial culture and subsequent antimicrobial susceptibility testing (AST) collected in 2018 from six large equine diagnostic laboratories were included. Resistance patterns were analysed including resistance to 1 or 2 antimicrobial classes, multidrug resistance (MDR), extensively drug resistant (XDR), resistance to highest priority critically important antimicrobials and isolates where there was no readily available treatment for adult horses in the UK. Submitting practices were classified according to whether they treated referral cases or not (first opinion). Comparisons between proportions and resistance for each bacterial group and sample site was performed using Chi-squared (or Fisher's exact test). RESULTS A total of 6,018 bacterial isolates from 4,038 diagnostic submissions were included from respiratory (n = 1555), urogenital (n = 1,010), skin/hair/wound/abscess (n = 753), surgical site infection (SSI) /catheter-related-infection (CRI) /orthopaedic infections (n = 347) and unknown/'other' submissions (n = 373). There were 2,711 Gram-negative isolates and 3,307 Gram-positive isolates. Prevalence of MDR for E. coli was 31.7%, Staphylococcus spp. 25.3% and > 25% for the majority of bacterial isolates from SSI/CRI/orthopaedic submissions. For Enterococcus spp. there was no readily available treatment for adult horses in the UK in 30.2% of positive submissions. MDR was significantly higher from referral hospital than first opinion submissions for the majority of pathogens (except Actinobacillus spp. and Pasteurella spp. and β-haemolytic Streptococcus spp.). MAIN LIMITATIONS Since culture and susceptibility results are not systematic analyses based on harmonised methods, selection bias could impact the findings. CONCLUSIONS Ongoing surveillance is essential to understand emerging patterns of resistance. MDR is high in SSI/CRI/orthopaedic infections, which is important for hospital biosecurity and guiding treatment decisions. Harmonisation of diagnostic procedures and interpretation of results amongst veterinary laboratories will improve AMR surveillance and data comparison among laboratories.
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Affiliation(s)
- Cajsa M Isgren
- Department of Equine Clinical Science, Institute of Infection, Veterinary and Ecological Sciences, Faculty of Health & Life Sciences, University of Liverpool, Neston, UK
| | - Nicola J Williams
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, Faculty of Health & Life Sciences, University of Liverpool, Neston, UK
| | - Owen D Fletcher
- Department of Equine Clinical Science, Institute of Infection, Veterinary and Ecological Sciences, Faculty of Health & Life Sciences, University of Liverpool, Neston, UK
| | - Dorina Timofte
- Department of Veterinary Anatomy, Physiology & Pathology, Institute of Infection, Veterinary and Ecological Sciences, Faculty of Health & Life Sciences, University of Liverpool, Neston, UK
| | | | - Thomas W Maddox
- Department of Musculoskeletal & Ageing Science, Institute of Life Course & Medical Sciences, Faculty of Health & Life Sciences, University of Liverpool, Neston, Cheshire, UK
| | - Peter D Clegg
- Department of Musculoskeletal & Ageing Science, Institute of Life Course & Medical Sciences, Faculty of Health & Life Sciences, University of Liverpool, Neston, Cheshire, UK
| | - Gina L Pinchbeck
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, Faculty of Health & Life Sciences, University of Liverpool, Neston, UK
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15
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Sanclemente JL, Rivera-Velez SM, Dasgupta N, Horohov DW, Wood PL, Sanz MG. Plasma lipidome of healthy and Rhodococcus equi-infected foals over time. Equine Vet J 2021; 54:121-131. [PMID: 33445210 DOI: 10.1111/evj.13422] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 12/22/2020] [Accepted: 01/03/2021] [Indexed: 01/08/2023]
Abstract
BACKGROUND Many foals that develop thoracic ultrasonographic lesions as a result of Rhodococcus equi infection heal on their own. However, most of these foals receive antimicrobials because foals at risk of developing clinical pneumonia cannot be identified. Untargeted lipidomics is useful to identify candidate biomarkers. OBJECTIVES (a) To describe the changes that occur in foal lipidomics as a result of ageing (birth to 8 weeks) and (b) To compare these results with those observed in foals after experimental infection with R. equi. STUDY DESIGN Experimental study. METHODS Healthy newborn foals (n = 9) were challenged with R. equi intratracheally the first week of life. Foals were treated with antimicrobials if they developed clinical pneumonia (n = 4, "clinical group") or were closely monitored if they showed no signs of disease (n = 5 "subclinical group"). An unchallenged group (n = 4) was also included. All foals were free of disease (transtracheal wash fluid evaluation and culture as well as thoracic ultrasonography) by 8 weeks of life. Plasma lipidomics was determined by LC-MS weekly for the study duration (8 weeks). RESULTS Both ageing and experimental infection altered the foal's plasma lipidome as demonstrated by multivariate statistical analysis. The intensities of 31 lipids were altered by ageing and 12 by infection (P < .05). Furthermore, nine lipids changed by more than twofold between clinical and subclinical groups. MAIN LIMITATIONS The number of foals is limited. Foals were experimentally challenged with R. equi. CONCLUSIONS Ageing and R. equi infection induced changes in the plasma lipidome of foals. These experimental results provide the background for future work in the discovery of earlier biomarkers of R. equi pneumonia. Early identification of foals at risk of developing clinical pneumonia is key in order to decrease antimicrobial use and development of antimicrobial resistance.
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Affiliation(s)
- Jorge L Sanclemente
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, WA, USA
| | - Sol Maiam Rivera-Velez
- Molecular Determinants Core, Johns Hopkins All Children's Hospital, Saint Petersburg, FL, USA
| | - Nairanjana Dasgupta
- Department of Mathematics and Statistics, College of Arts and Sciences, Washington State University, Pullman, WA, USA
| | - David W Horohov
- Maxwell H. Gluck Equine Research Center, Department of Veterinary Clinical Sciences, University of Kentucky, Lexington, KY, USA
| | - Paul L Wood
- Metabolomics Unit, Department of Physiology and Pharmacology, College of Veterinary Medicine, Lincoln Memorial University, Harrogate, TN, USA
| | - Macarena G Sanz
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, WA, USA
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16
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Mainguy-Seers S, Vargas A, Labrecque O, Bédard C, Hélie P, Lavoie JP. Randomised study of the immunomodulatory effects of azithromycin in severely asthmatic horses. Vet Rec 2020; 185:143. [PMID: 31371681 DOI: 10.1136/vr.105260] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 06/15/2019] [Accepted: 07/09/2019] [Indexed: 12/29/2022]
Abstract
Neutrophilic inflammation is believed to contribute to the airway obstruction and remodelling in equine asthma. Azithromycin, an antibiotic with immunomodulatory properties, reduces pulmonary neutrophilia and hyper-responsiveness in human asthmatics and decreases airway remodelling in rodent models of asthma. It was therefore hypothesised that azithromycin would improve lung function, mucus accumulation and central airway remodelling by decreasing luminal neutrophilia in severe equine asthma. The effects of a 10-day treatment with either azithromycin or ceftiofur, an antimicrobial without immune-modulating activity, were assessed using a blind, randomised, crossover design with six severe asthmatic horses in clinical exacerbation. Lung function, tracheal mucus accumulation, tracheal wash bacteriology, bronchial remodelling, airway neutrophilia and mRNA expression of proinflammatory cytokines (interleukin (IL)-8, IL-17A, IL-1β, tumour necrosis factor-α) in bronchoalveolar lavage fluid were evaluated. Azithromycin decreased the expression of IL-8 (P=0.03, one-tailed) and IL-1β (P=0.047, one-tailed) but failed to improve the other variables evaluated. Ceftiofur had no effect on any parameter. The reduction of neutrophilic chemoattractants (IL-8, IL-1β) justifies further efforts to investigate the effects of a prolonged treatment with macrolides on airway neutrophilia and remodelling. The lack of efficacy of ceftiofur suggests that severe equine asthma should not be treated with antibiotics at first-line therapy.
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Affiliation(s)
- Sophie Mainguy-Seers
- Faculty of Veterinary Medicine, Department of Clinical Sciences, Université de Montréal, St-Hyacinthe, Quebec, Canada
| | - Amandine Vargas
- Faculty of Veterinary Medicine, Department of Clinical Sciences, Université de Montréal, St-Hyacinthe, Quebec, Canada
| | - Olivia Labrecque
- Laboratoire d'epidemiosurveillance animale du Quebec, Saint-Hyacinthe, Quebec, Canada
| | - Christian Bédard
- Faculty of Veterinary Medicine, Department of Pathology and Microbiology, Université de Montréal, St-Hyacinthe, Quebec, Canada
| | - Pierre Hélie
- Faculty of Veterinary Medicine, Department of Pathology and Microbiology, Université de Montréal, St-Hyacinthe, Quebec, Canada
| | - Jean-Pierre Lavoie
- Faculty of Veterinary Medicine, Department of Clinical Sciences, Université de Montréal, St-Hyacinthe, Quebec, Canada
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17
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Álvarez-Narváez S, Berghaus LJ, Morris ERA, Willingham-Lane JM, Slovis NM, Giguere S, Cohen ND. A Common Practice of Widespread Antimicrobial Use in Horse Production Promotes Multi-Drug Resistance. Sci Rep 2020; 10:911. [PMID: 31969575 PMCID: PMC6976650 DOI: 10.1038/s41598-020-57479-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 12/21/2019] [Indexed: 02/07/2023] Open
Abstract
The practice of prophylactic administration of a macrolide antimicrobial with rifampin (MaR) to apparently healthy foals with pulmonary lesions identified by thoracic ultrasonography (i.e., subclinically pneumonic foals) is common in the United States. The practice has been associated epidemiologically with emergence of R. equi resistant to MaR. Here, we report direct evidence of multi-drug resistance among foals treated with MaR. In silico and in vitro analysis of the fecal microbiome and resistome of 38 subclinically pneumonic foals treated with either MaR (n = 19) or gallium maltolate (GaM; n = 19) and 19 untreated controls was performed. Treatment with MaR, but not GaM, significantly decreased fecal microbiota abundance and diversity, and expanded the abundance and diversity of antimicrobial resistance genes in feces. Soil plots experimentally infected with Rhodococcus equi (R. equi) and treated with MaR selected for MaR-resistant R. equi, whereas MaR-susceptible R. equi out-competed resistant isolates in GaM-treated or untreated plots. Our results indicate that MaR use promotes multi-drug resistance in R. equi and commensals that are shed into their environment where they can persist and potentially infect or colonize horses and other animals.
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Affiliation(s)
- S Álvarez-Narváez
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, Ga, USA
| | - L J Berghaus
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, Ga, USA
| | - E R A Morris
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, USA
| | - J M Willingham-Lane
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, Ga, USA
| | - N M Slovis
- Hagyard Equine Medical Institute, Lexington, KY, USA
| | - S Giguere
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, Ga, USA
| | - N D Cohen
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, USA.
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18
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Abstract
Clostridium (Clostridioides) difficile is a gram-positive, spore-forming bacterium that is an important cause of disease in people, a variably important cause of disease in some animal species, and an apparently harmless commensal in others. Regardless of whether it is a known pathogen in a particular species, it can also be found in healthy individuals, sometimes at high prevalences and typically with higher rates of carriage in young individuals. As it is investigated in more animal species, it is apparent that this bacterium is widely disseminated in a diverse range of domestic and wild animal species. Although it can be found in most species in which investigations have been performed, there are pronounced intra- and inter-species differences in prevalence and clinical relevance. A wide range of strains can be identified, some that appear to be animal associated and others that are found in humans and animals. A large percentage of strains that cause disease in people can at least sporadically be found in animals. It is a potentially important zoonotic pathogen, but there is limited direct evidence of animal-human transmission. Although C. difficile has been studied extensively over the past few decades, it remains an enigmatic organism in many ways.
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Affiliation(s)
- J Scott Weese
- Department of Pathobiology and Centre for Public Health and Zoonoses, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada (Weese)
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19
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20
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Hines MT. Clinical Approach to Commonly Encountered Problems. EQUINE INTERNAL MEDICINE 2018. [PMCID: PMC7158300 DOI: 10.1016/b978-0-323-44329-6.00007-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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21
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Giguère S. Treatment of Infections Caused by Rhodococcus equi. Vet Clin North Am Equine Pract 2017; 33:67-85. [DOI: 10.1016/j.cveq.2016.11.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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22
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Ovesen AL, Riihimäki M, Båverud V, Pringle M. Antimicrobial Susceptibility of Bacteroides spp. From Clinical Samples From Horses. J Equine Vet Sci 2016. [DOI: 10.1016/j.jevs.2016.06.073] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Johns I. Prevention and treatment of
Rhodococcus equi
infection in foals: an update. IN PRACTICE 2016. [DOI: 10.1136/inp.i4665] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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24
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Bandelj P, Golob M, Ocepek M, Zdovc I, Vengust M. Antimicrobial Susceptibility Patterns ofClostridium difficileIsolates from Family Dairy Farms. Zoonoses Public Health 2016; 64:213-221. [DOI: 10.1111/zph.12299] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Indexed: 01/05/2023]
Affiliation(s)
- P. Bandelj
- Veterinary Faculty; University of Ljubljana; Ljubljana Slovenia
| | - M. Golob
- Veterinary Faculty; University of Ljubljana; Ljubljana Slovenia
| | - M. Ocepek
- Veterinary Faculty; University of Ljubljana; Ljubljana Slovenia
| | - I. Zdovc
- Veterinary Faculty; University of Ljubljana; Ljubljana Slovenia
| | - M. Vengust
- Veterinary Faculty; University of Ljubljana; Ljubljana Slovenia
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25
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Abstract
Clostridium difficile is a confirmed pathogen in a wide variety of mammals, but the incidence of disease varies greatly in relation to host species, age, environmental density of spores, administration of antibiotics, and possibly, other factors. Lesions vary as well, in severity and distribution within individuals, and in some instances, age groups, of a given species. The cecum and colon are principally affected in most species, but foals and rabbits develop severe jejunal lesions. Explanations for variable susceptibility of species, and age groups within a species, are largely speculative. Differences in colonization rates and toxin-receptor densities have been proposed. Clostridium difficile-associated disease is most commonly diagnosed in Syrian hamsters, horses, and neonatal pigs, but it is reported sporadically in many other species. The essential virulence factors of C. difficile are large exotoxins, toxin A (TcdA) and toxin B (TcdB). Receptor-mediated endocytosis of the toxins is followed by endosomal acidification, a necessary step for conversion of the toxin to its active form in the cytosol. Cell-surface receptors have been characterized for TcdA, but remain to be identified for TcdB. Both TcdA and TcdB disrupt the actin cytoskeleton by disrupting Rho-subtype, intracellular signaling molecules. Disruption of the actin cytoskeleton is catastrophic for cellular function, but inflammation and neurogenic stimuli are also involved in the pathogenesis of the disease.
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Affiliation(s)
- M K Keel
- The University of Arizona, Department of Veterinary Sciences and Microbiology, Building #90, Room 212, 1117 East Lowell St., Tucson, AZ 85721, USA
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26
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Bandelj P, Blagus R, Briski F, Frlic O, Vergles Rataj A, Rupnik M, Ocepek M, Vengust M. Identification of risk factors influencing Clostridium difficile prevalence in middle-size dairy farms. Vet Res 2016; 47:41. [PMID: 26968527 PMCID: PMC4788955 DOI: 10.1186/s13567-016-0326-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 01/25/2016] [Indexed: 12/22/2022] Open
Abstract
Farm animals have been suggested to play an important role in the epidemiology of Clostridium difficile infection (CDI) in the community. The purpose of this study was to evaluate risk factors associated with C. difficile dissemination in family dairy farms, which are the most common farming model in the European Union. Environmental samples and fecal samples from cows and calves were collected repeatedly over a 1 year period on 20 mid-size family dairy farms. Clostridium difficile was detected in cattle feces on all farms using qPCR. The average prevalence between farms was 10% (0–44.4%) and 35.7% (3.7–66.7%) in cows and calves, respectively. Bacterial culture yielded 103 C. difficile isolates from cattle and 61 from the environment. Most C. difficile isolates were PCR-ribotype 033. A univariate mixed effect model analysis of risk factors associated dietary changes with increasing C. difficile prevalence in cows (P = 0.0004); and dietary changes (P = 0.004), breeding Simmental cattle (P = 0.001), mastitis (P = 0.003) and antibiotic treatment (P = 0.003) in calves. Multivariate analysis of risk factors found that dietary changes in cows (P = 0.0001) and calves (P = 0.002) increase C. difficile prevalence; mastitis was identified as a risk factor in calves (P = 0.001). This study shows that C. difficile is common on dairy farms and that shedding is more influenced by farm management than environmental factors. Based on molecular typing of C. difficile isolates, it could also be concluded that family dairy farms are currently not contributing to increased CDI incidence.
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Affiliation(s)
- Petra Bandelj
- Veterinary faculty, University of Ljubljana, cesta v Mestni log 47, 1115, Ljubljana, Slovenia.
| | - Rok Blagus
- Institute for biostatistics and Medical informatics, University of Ljubljana, Vrazov trg 2, 1104, Ljubljana, Slovenia
| | | | - Olga Frlic
- , Vinharje 6, 4223, Poljane nad Skofjo Loko, Slovenia
| | | | - Maja Rupnik
- National Laboratory for Health, Environment and Food, Prvomajska ulica 1, 2000, Maribor, Slovenia.,Faculty of Medicine, University of Maribor, Taborska ulica 8, 2000, Maribor, Slovenia.,Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins, Jamova cesta 39, 1000, Ljubljana, Slovenia
| | - Matjaz Ocepek
- Veterinary faculty, University of Ljubljana, cesta v Mestni log 47, 1115, Ljubljana, Slovenia
| | - Modest Vengust
- Veterinary faculty, University of Ljubljana, cesta v Mestni log 47, 1115, Ljubljana, Slovenia
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27
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Epidemiology and Antimicrobial Resistance in Clostridium difficile With Special Reference to the Horse. CURRENT CLINICAL MICROBIOLOGY REPORTS 2016. [DOI: 10.1007/s40588-016-0029-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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28
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Schoster A, Staempfli HR, Abrahams M, Jalali M, Weese JS, Guardabassi L. Effect of a probiotic on prevention of diarrhea and Clostridium difficile and Clostridium perfringens shedding in foals. J Vet Intern Med 2015; 29:925-31. [PMID: 25903509 PMCID: PMC4895414 DOI: 10.1111/jvim.12584] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 02/15/2015] [Accepted: 03/04/2015] [Indexed: 12/20/2022] Open
Abstract
Background Up to 60% of foals develop diarrhea within 6 months after birth. Preventive measures are limited but potentially probiotics could be used. Objective To evaluate the effect of a newly designed probiotic on the incidence of foal diarrhea in a randomized field trial. Animals Seventy‐two healthy neonatal foals. Methods Randomized, placebo‐controlled field trial. Foals were administered a placebo or probiotic for 3 weeks and monitored for an additional week. A total of 3 fecal samples were taken from each foal at biweekly intervals. Statistical modeling was applied for comparison of incidence and duration of diarrhea and fecal shedding of Clostridium perfringens and Clostridium difficile between treatment and age groups. Results The overall incidence of diarrhea was 41 of 72 (59%) and did not differ (P = 0.37) between treatment groups. Foals treated with probiotics were more likely to develop diarrhea requiring veterinary intervention (P = 0.007). Age had a significant effect on incidence of diarrhea (P < 0.001); foals 8–15 days old having the highest probability of developing diarrhea. Duration of diarrhea and soft feces were not significantly different between groups. The prevalence of C. perfringens shedding was 55% with no difference between treatment groups (P = 0.23). The prevalence of C. difficile shedding was 11%. Conclusion and Clinical Importance There was no benefit of administering a 3‐week course of probiotics, but potential adverse effects were noted. Whether the probiotics lacked a clinical effect, or the choice of strains or dose was inadequate, is unknown. Clostridial shedding was not influenced by probiotics despite in vitro activity of probiotics.
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Affiliation(s)
- A Schoster
- Faculty of Health and Medical Science, University of Copenhagen, Frederiksberg, Denmark.,Vetsuisse Faculty, Equine Department, Clinic for Equine Internal Medicine, University of Zurich, Zurich, Switzerland
| | - H R Staempfli
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - M Abrahams
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - M Jalali
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - J S Weese
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - L Guardabassi
- Faculty of Health and Medical Science, University of Copenhagen, Frederiksberg, Denmark
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29
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Dunkel B, Johns IC. Antimicrobial use in critically ill horses. J Vet Emerg Crit Care (San Antonio) 2015; 25:89-100. [PMID: 25582245 DOI: 10.1111/vec.12275] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 09/15/2014] [Indexed: 02/03/2023]
Abstract
OBJECTIVE To discuss controversies surrounding antimicrobial use in critically ill horses. DATA SOURCES PubMed searches from 1970-present for terms including, but not limited to: "horse," "foal," "antimicrobial," "prophylaxis," "infection," "surgery," "sepsis," and "antimicrobial resistance." HUMAN DATA SYNTHESIS Increasing bacterial antimicrobial resistance has changed first-line antimicrobial choices and prompted shortening of the duration of prophylactic and therapeutic treatment. The need to decrease bacterial resistance development to critically important antimicrobials has been highlighted. VETERINARY DATA SYNTHESIS Veterinary medicine has followed a similar trend but often without a high-level evidence. Common dilemmas include diseases in which the theoretically most effective drug is a reserved antimicrobial, the inability to differentiate infectious from noninfectious disease, the duration and necessity of prophylactic antimicrobials and use of antimicrobials in primary gastrointestinal disease. These problems are illustrated using examples of purulent infections, neonatal sepsis, colic surgery, and treatment of colitis. Although enrofloxacin, cephalosporins, and doxycycline, in contrast to gentamicin, reach therapeutic concentrations within the lungs of healthy horses, the first two should not be used as first line treatment due to their reserved status. Due to the high risk of bacterial sepsis, antimicrobial treatment remains indispensable in compromised neonatal foals but shortening the length of antimicrobial treatment might be prudent. One prospective randomized study demonstrated no difference between 3 and 5 days of perioperative antimicrobial treatment in colic surgery but shorter durations were not evaluated. High-level evidence to recommend antimicrobial treatment of adult horses with undifferentiated diarrhea does not exist. CONCLUSIONS Few evidence-based recommendations can be made. Commonly used antimicrobial combinations remain the mainstay for treating purulent infections. Antimicrobial treatment for compromised foals should not extend beyond recovery. Continuation of prophylactic antimicrobials >3 days is likely unnecessary after colic surgery; shorter durations might be equally effective. Antimicrobial prophylaxis in adult horses with diarrhea is unlikely to be beneficial.
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Affiliation(s)
- Bettina Dunkel
- Department of Clinical Science and Services, The Royal Veterinary College, North Mymms, Hatfield, Hertforshire, United Kingdom, United Kingdom
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Diab S, Songer G, Uzal F. Clostridium difficile infection in horses: A review. Vet Microbiol 2013; 167:42-9. [DOI: 10.1016/j.vetmic.2013.03.032] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 03/05/2013] [Accepted: 03/27/2013] [Indexed: 11/26/2022]
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Yan W, Shin KS, Wang SJ, Xiang H, Divers T, McDonough S, Bowman J, Rowlands A, Akey B, Mohamed H, Chang YF. Equine hyperimmune serum protects mice against Clostridium difficile spore challenge. J Vet Sci 2013; 15:249-58. [PMID: 24136208 PMCID: PMC4087227 DOI: 10.4142/jvs.2014.15.2.249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Accepted: 08/14/2013] [Indexed: 01/05/2023] Open
Abstract
Clostridium (C.) difficile is a common cause of nosocomial diarrhea in horses. Vancomycin and metronidazole have been used as standard treatments but are only moderately effective, which highlights the need for a novel alternative therapy. In the current study, we prepared antiserum of equine origin against both C. difficile toxins A and B as well as whole-cell bacteria. The toxin-neutralizing activities of the antibodies were evaluated in vitro and the prophylactic effects of in vivo passive immunotherapy were demonstrated using a conventional mouse model. The data demonstrated that immunized horses generated antibodies against both toxins A and B that possessed toxin-neutralizing activity. Additionally, mice treated with the antiserum lost less weight without any sign of illness and regained weight back to a normal range more rapidly compared to the control group when challenged orally with 107C. difficile spores 1 day after serum injection. These results indicate that intravenous delivery of hyperimmune serum can protect animals from C. difficile challenge in a dose-dependent manner. Hence, immunotherapy may be a promising prophylactic strategy for preventing C. difficile infection in horses.
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Affiliation(s)
- Weiwei Yan
- Animal Health Diagnostic Center, Departments of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
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Monteiro MA, Ma Z, Bertolo L, Jiao Y, Arroyo L, Hodgins D, Mallozzi M, Vedantam G, Sagermann M, Sundsmo J, Chow H. Carbohydrate-based Clostridium difficile vaccines. Expert Rev Vaccines 2013; 12:421-31. [PMID: 23560922 DOI: 10.1586/erv.13.9] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Clostridium difficile is responsible for thousands of deaths each year and a vaccine would be welcomed, especially one that would disrupt bacterial maintenance, colonization and persistence in carriers and convalescent patients. Structural explorations at the University of Guelph (ON, Canada) discovered that C. difficile may express three phosphorylated polysaccharides, named PSI, PSII and PSIII; this review captures our recent efforts to create vaccines based on these glycans, especially PSII, the common antigen that has precipitated immediate attention. The authors describe the design and immunogenicity of vaccines composed of raw polysaccharides and conjugates thereof. So far, it has been observed that anti-PSII antibodies can be raised in farm animals, mice and hamster models; humans and horses carry anti-PSII IgA and IgG antibodies from natural exposure to C. difficile, respectively; phosphate is an indispensable immunogenic epitope and vaccine-induced PSII antibodies recognize PSII on C. difficile outer surface.
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Diab SS, Rodriguez-Bertos A, Uzal FA. Pathology and Diagnostic Criteria ofClostridium difficileEnteric Infection in Horses. Vet Pathol 2013; 50:1028-36. [DOI: 10.1177/0300985813489039] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- S. S. Diab
- California Animal Health and Food Safety Laboratory System, University of California, Davis, San Bernardino, CA, USA
- These authors contributed equally to this work
| | - A. Rodriguez-Bertos
- Department of Surgery and Internal Medicine, Universidad Complutense de Madrid, Madrid, Spain
- These authors contributed equally to this work
| | - F. A. Uzal
- California Animal Health and Food Safety Laboratory System, University of California, Davis, San Bernardino, CA, USA
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Artiushin S, Timoney JF, Fettinger M, Fallon L, Rathgeber R. Immunisation of mares with binding domains of toxins A and B of Clostridium difficile elicits serum and colostral antibodies that block toxin binding. Equine Vet J 2012. [PMID: 23206274 DOI: 10.1111/evj.12007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
REASONS FOR PERFORMING STUDY Enterocolitis caused by Clostridium difficile (C. difficile) is a serious, sometimes fatal, disease of neonatal foals and older horses. Toxins A and B (TcdA and B) produced by C. difficile are important virulence factors. Immunisation of mares with receptor binding domains of toxins may prevent or reduce the severity of C. difficile colitis in foals. OBJECTIVES To determine whether antibodies generated in the pregnant mare to the binding regions of TcdA and B will neutralise TcdA and B toxicity. METHODS Sequences encoding the binding domains of each toxin were isolated by PCR amplification from C. difficile JF09, a foal isolate, and cloned and expressed into pET15b. Thirteen mares were immunised twice 2 weeks apart with 200 μg of each recombinant protein with Quil A 2 months prior to foaling. Antibodies were assayed in the sera and colostrum by ELISA and for ability to block the cytopathic activity of each of toxin for equine endothelial cells. RESULTS All mares produced strong serum antibody responses to the binding domain of each toxin. A high level of toxin-specific antibodies was also detected in colostrum and in most foal sera 2 days after suckling. Diluted sera and colostrum premixed with either TcdA or B had no effect on the morphology of equine endothelial cells. Application of the same concentration of toxins alone or premixed with nonimmune mare/foal serum or colostrum led to an unambiguous cytopathic effect that ranged from complete degradation to varying degrees of cell rounding. CONCLUSIONS Immunisation of pregnant mares with recombinant binding domains of TcdA and B of C. difficile resulted in the production of specific antibodies in serum and colostrum that blocked the cytopathic activity of toxins. POTENTIAL RELEVANCE Results of studies support the feasibility of a prepartum vaccine against C. difficile enterocolitis in foals.
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Affiliation(s)
- S Artiushin
- Gluck Equine Research Center, University of Kentucky, USA
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Barr BS, Waldridge BM, Morresey PR, Reed SM, Clark C, Belgrave R, Donecker JM, Weigel DJ. Antimicrobial-associated diarrhoea in three equine referral practices. Equine Vet J 2012; 45:154-8. [PMID: 22779907 DOI: 10.1111/j.2042-3306.2012.00595.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
REASONS FOR PERFORMING STUDY Although antimicrobial-associated diarrhoea (AAD) is the most frequently observed adverse effect of antimicrobial therapy in horses, few multicentred studies on the prevalence of AAD have been performed. OBJECTIVES To determine the prevalence of AAD in horses that developed diarrhoea after antimicrobial treatment for nondiarrhoeic conditions and identify the antimicrobials used. METHODS The 2009 database of 3 referral hospitals was searched to identify nonhospitalised horses (weanling age or older) treated with antimicrobials for nongastrointestinal conditions. Horses with these criteria that presented with diarrhoea during 2009 were included in the study. Additional information, including antimicrobial administered and results of faecal pathogen testing, was gathered on each hospitalised case. RESULTS Of the 5251 horses treated with antimicrobials for nongastrointestinal signs, 32 were diagnosed with probable AAD, a prevalence of 0.6% (95% confidence interval: 0.43-0.86%). The AAD-diagnosed horses had an 18.8% (6/32) mortality rate. Horses with AAD had been treated for an average of 4.2 days. The most frequently used antimicrobials in horses with AAD were gentamicin in combination with penicillin (n = 7), enrofloxacin (n = 7) and doxycycline (n = 4). Clostridium difficile was identified in faecal samples from 4 horses, 2 of which died and Salmonella from 3 horses. CONCLUSIONS Results indicated that the prevalence of AAD is low. Any antimicrobial class commonly used in equine practice is a potential cause of equine AAD. Other risk factors, such as opportunistic enteropathogens, may play a part in the development of diarrhoea secondary to antimicrobial usage. POTENTIAL RELEVANCE Although the risk of equine AAD is low, this sequela of antimicrobial treatment is possible especially when opportunistic enteropathogens or other risk factors are present. Because drugs from any antimicrobial class can be potentially involved in AAD, clinicians have additional incentive to ensure the judicious use of antimicrobial agents.
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Affiliation(s)
- B S Barr
- Rood and Riddle Equine Hospital, Kentucky, USA
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Bergström K, Aspan A, Landén A, Johnston C, Grönlund-Andersson U. The first nosocomial outbreak of methicillin-resistant Staphylococcus aureus in horses in Sweden. Acta Vet Scand 2012; 54:11. [PMID: 22316072 PMCID: PMC3348035 DOI: 10.1186/1751-0147-54-11] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Accepted: 02/08/2012] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Methicillin-resistant Staphylococcus aureus (MRSA) in animals is a rare finding in Sweden. In horses, MRSA was first detected in a screening survey in 2007. In 2008, six clinical cases occurred in an equine hospital, indicating an outbreak. METHOD All MRSA isolates detected, 11 spa-type t011 and one t064 (n = 12), in infected horses (n = 10) and screening of horses (n = 2) in Sweden from December 2007 to March 2010 were retrospectively analysed with pulsed-field gel electrophoresis (PFGE) using Cfr9I and ApaI restriction enzymes, to study relationship between the isolates. Medical records of infected horses and outbreak investigation notes were scrutinised to monitor the clinical outcome and other aspects of the outbreak. RESULTS Eight of the 10 infected horses were linked to one equine hospital and two to another hospital in the same region. The six horses infected with MRSA in 2008 underwent surgery during the period 22 May-7 July in one of the hospitals. Four more infections linked to the two hospitals were notified between 2009 and March 2010.Nine of the 11 spa-type t011 isolates had identical Cfr9I and ApaI PFGE pattern. All six infected horses from 2008 presented with this MRSA. Two t011 isolates differed in one and two bands, respectively, in PFGE.Nine horses suffered from surgical site infections (SSI). No antimicrobials were used following the MRSA diagnosis and the infections cleared. The time from surgery to MRSA diagnosis differed greatly between the horses (range 15-52 days). CONCLUSIONS Association in time and space of six horses infected with an identical MRSA strain of spa-type t011 confirmed an outbreak. Two isolates found in 2009 and 2010 in the outbreak hospital were closely related to the outbreak strain, indicating one circulating strain. Both spa-type t011 and t064 have been reported in horses in Europe prior to these findings. The observation that the infections cleared although antimicrobials were not used is encouraging for future prudent use of antimicrobials. The time from surgery to bacteriological diagnosis was not acceptable in most cases, as contagious spread was a risk. Sampling when symptoms of infection are noticed and accurate analysis are thus important.
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Affiliation(s)
- Karin Bergström
- Faculty of Veterinary Medicine and Animal Husbandry, Swedish University of Agricultural Sciences, 750 07 Uppsala, Sweden
- Department of Animal Health and Antimicrobial Strategies, SVA, 750 89 Uppsala, Sweden
| | - Anna Aspan
- Department of Bacteriology, SVA, 751 89 Uppsala, Sweden
| | - Annica Landén
- Department of Animal Health and Antimicrobial Strategies, SVA, 750 89 Uppsala, Sweden
| | - Christopher Johnston
- Equine Clinics, University Animal Hospital, University of Agricultural Sciences, 750 07 Uppsala, Sweden
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LECLERE M, MAGDESIAN KG, COLE CA, SZABO NJ, RUBY RE, RHODES DM, EDMAN J, VALE A, WILSON WD, TELL LA. Pharmacokinetics and preliminary safety evaluation of azithromycin in adult horses. J Vet Pharmacol Ther 2011; 35:541-9. [DOI: 10.1111/j.1365-2885.2011.01351.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Giguère S, Cohen ND, Chaffin MK, Slovis NM, Hondalus MK, Hines SA, Prescott JF. Diagnosis, treatment, control, and prevention of infections caused by Rhodococcus equi in foals. J Vet Intern Med 2011; 25:1209-20. [PMID: 22092608 DOI: 10.1111/j.1939-1676.2011.00835.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 09/22/2011] [Accepted: 10/04/2011] [Indexed: 11/29/2022] Open
Abstract
Rhodococcus equi, a gram-positive facultative intracellular pathogen, is one of the most common causes of pneumonia in foals. Although R. equi can be cultured from the environment of virtually all horse farms, the clinical disease in foals is endemic at some farms, sporadic at others, and unrecognized at many. On farms where the disease is endemic, costs associated with morbidity and mortality attributable to R. equi may be very high. The purpose of this consensus statement is to provide recommendations regarding the diagnosis, treatment, control, and prevention of infections caused by R. equi in foals.
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Affiliation(s)
- S Giguère
- Department of Large Animal Medicine, University of Georgia, Athens, GA 30602, USA.
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Magdesian KG, Leutenegger C. Real-time PCR and typing of Clostridium difficile isolates colonizing mare–foal pairs. Vet J 2011; 190:119-23. [DOI: 10.1016/j.tvjl.2010.10.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2009] [Revised: 09/25/2010] [Accepted: 10/01/2010] [Indexed: 11/15/2022]
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Thean S, Elliott B, Riley TV. Clostridium difficile in horses in Australia--a preliminary study. J Med Microbiol 2011; 60:1188-1192. [PMID: 21436371 DOI: 10.1099/jmm.0.030908-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
During a 24 month period from 2007 to 2009, 174 faecal specimens from horses in Australia (predominantly from Western Australia) were tested for Clostridium difficile. C. difficile was isolated from 14 (23 %) of 62 diarrhoeal animals (including 10 foals) and from none of 112 healthy adult horses. These isolates were toxin profiled by PCR for toxin A, toxin B and binary toxin, and ribotyped. Ten of the equine isolates were A(+)B(+)CDT(-). Other toxin profiles detected were A(-)B(-)CDT(+) (one isolate), A(+)B(+)CDT(+) (two isolates) and A(-)B(-)CDT(-) (three isolates). There were six different ribotypes detected in the horses, ribotype 012 being the most common with six isolates. Two horses (one adult and one foal) had two strains of C. difficile isolated on different days. These strains had the same toxin profile but different ribotypes. None of the equine isolates was ribotype 078, which is A(+)B(+)CDT(+) and a significant cause of animal disease overseas. All isolates were susceptible to metronidazole and vancomycin. These results suggest that the epidemiology of C. difficile in horses in Australia is currently similar to that in other parts of the world, but requires further surveillance to monitor changes.
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Affiliation(s)
- Sara Thean
- Division of Microbiology and Infectious Diseases, PathWest Laboratory Medicine, Nedlands 6009, Western Australia, Australia
| | - Briony Elliott
- Microbiology and Immunology, University of Western Australia, Nedlands 6009, Western Australia, Australia
| | - Thomas V Riley
- Microbiology and Immunology, University of Western Australia, Nedlands 6009, Western Australia, Australia.,Division of Microbiology and Infectious Diseases, PathWest Laboratory Medicine, Nedlands 6009, Western Australia, Australia
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Singh B, Chauhan M, Sindhu R, Gulati B, Khurana S, Singh B, Yadav H, Yadav R. Diseases Prevalent in Equids in India: A Survey of Veterinary Practitioners. ACTA ACUST UNITED AC 2010. [DOI: 10.3923/ajava.2010.143.153] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Weese JS, Toxopeus L, Arroyo L. Clostridium difficile associated diarrhoea in horses within the community: predictors, clinical presentation and outcome. Equine Vet J 2010; 38:185-8. [PMID: 16536390 DOI: 10.2746/042516406776563369] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- J S Weese
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
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Wise R. Antimicrobial resistance: the microbe's struggle for survival. Equine Vet J 2010; 35:530-1. [PMID: 14515950 DOI: 10.2746/042516403775467144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Sampieri F, Hinchcliff KW, Toribio RE. Tetracycline therapy of Lawsonia intracellularis enteropathy in foals. Equine Vet J 2010; 38:89-92. [PMID: 16411593 DOI: 10.2746/042516406775374270] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- F Sampieri
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, 601 Vernon L. Tharp Street, Columbus, Ohio 43210, USA
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Toutain PL, Ferran A, Bousquet-Mélou A. Species differences in pharmacokinetics and pharmacodynamics. Handb Exp Pharmacol 2010:19-48. [PMID: 20204582 DOI: 10.1007/978-3-642-10324-7_2] [Citation(s) in RCA: 131] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Veterinary medicine faces the unique challenge of having to treat many types of domestic animal species, including mammals, birds, and fishes. Moreover, these species have evolved into genetically unique breeds having certain distinguishable characteristics developed by artificial selection. The main challenge for veterinarians is not to select a drug but to determine, for the selected agent, a rational dosing regimen because the dosage regimen for a drug in a given species may depend on its anatomy, biochemistry, physiology, and behaviour as well as on the nature and causes of the condition requiring treatment. Both between- and within-species differences in drug response can be explained either by variations in drug pharmacokinetics (PK) or drug pharmacodynamics (PD), the magnitude of which varies from drug to drug. This chapter highlights selected aspects of species differences in PK and PD and considers underlying physiological and patho-physiological mechanisms in the main domestic species. Particular attention was paid to aspects of animal behaviour (food behaviour, social behavior, etc.) as a determinant of interspecies differences in PK or/and PD. Modalities of drug administration are many and result not only from anatomical, physiological and/or behavioural differences across species but also from management options. The latter is the case for collective/group treatment of food-producing animals, frequently dosed by the oral route at a herd or flock level. After drug administration, the main causes of observed inter-species differences arise from species differences in the handling of drugs (absorption, distribution, metabolism, and elimination). Such differences are most common and of greatest magnitude when functions which are phylogenetically divergent between species, such as digestive functions (ruminant vs. non-ruminant, carnivore vs. herbivore, etc.), are involved in drug absorption. Interspecies differences also exist in drug action but these are generally more limited, except when a particular targeted function has evolved, as is the case for reproductive physiology (mammals vs. birds vs. fishes; annual vs. seasonal reproductive cycle in mammals; etc.). In contrast, for antimicrobial and antiparasitic drugs, interspecies differences are more limited and rather reflect those of the pathogens than of the host. Interspecies difference in drug metabolism is a major factor accounting for species differences in PK and also in PD (production or not of active metabolites). Recent and future advances in molecular biology and pharmacogenetics will enable a more comprehensive view of interspecies differences and also between breeds with existing polymorphism. Finally, the main message of this review is that differences between species are not only numerous but also often unpredictable so that no generalisations are possible, even though for several drugs allometric approaches do allow some valuable interspecies extrapolations. Instead, each drug must be investigated on a species-by-species basis to guarantee its effective and safe use, thus ensuring the well-being of animals and safeguarding of the environment and human consumption of animal products.
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Affiliation(s)
- Pierre-Louis Toutain
- Unité Mixte de Recherche 181 Physiopathologie et Toxicologie Expérimentales, Institut National de la Recherche Agronomique et Ecole Nationale Vétérinaire de Toulouse, 23 Chemin des Capelles, BP 87 614, 31076 Toulouse Cedex 03, France.
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Antimicrobial associated diarrhoea in the horse. Part 2: Which antimicrobials are associated with AAD in the horse? EQUINE VET EDUC 2009. [DOI: 10.2746/095777309x4710] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Abstract
The development of diarrhea among hospitalized horses is a major concern for equine veterinary hospitals and referral centers. It is a potential complication of hospitalization for surgical or medical procedures and can contribute to the morbidity and mortality of horses with gastrointestinal and non-gastrointestinal diseases. Unfortunately, it can be difficult to pinpoint the exact cause of acute diarrhea or colitis, and in most cases, the specific etiologic agent is presumptive or undetermined. This article discusses the major etiologic agents of diarrhea in hospitalized horses, considers factors that place hospitalized horses at special risk for diarrhea, and examines several infectious colitis outbreaks that have occurred at veterinary referral centers.
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Songer JG, Trinh HT, Dial SM, Brazier JS, Glock RD. Equine colitis X associated with infection by Clostridium difficile NAP1/027. J Vet Diagn Invest 2009; 21:377-80. [PMID: 19407094 DOI: 10.1177/104063870902100314] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A 14-year-old Quarter Horse with a 48-hr history of colic was euthanized after failure to respond to treatment. At necropsy, cecal and colonic mucosae were congested throughout, and there was segmental edema and significant thickening of the intestinal wall. Excessive numbers of mononuclear cells were found in mucosal lamina propria. Submucosal hemorrhage was diffuse and extensive, and Clostridium difficile toxins A and B were detected. Large numbers of C. difficile were isolated, and genetic characterization revealed them to be North American pulsed-field gel electrophoresis type 1, polymerase chain reaction ribotype 027, and toxinotype III. Genes for the binary toxin were present, and toxin negative-regulator tcdC contained an 18-bp deletion. This genotype comprises the current human "epidemic strain," which is associated with human C. difficile-associated disease of greater than historical severity. The diagnosis was peracute typhlocolitis, with lesions and history typical of those attributed to colitis X.
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Affiliation(s)
- J Glenn Songer
- Department of Veterinary Science and Microbiology, 1117 East Lowell Street, The University of Arizona, Tucson, AZ 85721, USA.
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