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Deschner D, Voordouw MJ, Fernando C, Campbell J, Waldner CL, Hill JE. Identification of genetic markers of resistance to macrolide class antibiotics in Mannheimia haemolytica isolates from a Saskatchewan feedlot. Appl Environ Microbiol 2024:e0050224. [PMID: 38864630 DOI: 10.1128/aem.00502-24] [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: 03/17/2024] [Accepted: 05/13/2024] [Indexed: 06/13/2024] Open
Abstract
Mannheimia haemolytica is a major contributor to bovine respiratory disease (BRD), which causes substantial economic losses to the beef industry, and there is an urgent need for rapid and accurate diagnostic tests to provide evidence for treatment decisions and support antimicrobial stewardship. Diagnostic sequencing can provide information about antimicrobial resistance genes in M. haemolytica more rapidly than conventional diagnostics. Realizing the full potential of diagnostic sequencing requires a comprehensive understanding of the genetic markers of antimicrobial resistance. We identified genetic markers of resistance in M. haemolytica to macrolide class antibiotics commonly used for control of BRD. Genome sequences were determined for 99 M. haemolytica isolates with six different susceptibility phenotypes collected over 2 years from a feedlot in Saskatchewan, Canada. Known macrolide resistance genes estT, msr(E), and mph(E) were identified in most resistant isolates within predicted integrative and conjugative elements (ICEs). ICE sequences lacking antibiotic resistance genes were detected in 10 of 47 susceptible isolates. No resistance-associated polymorphisms were detected in ribosomal RNA genes, although previously unreported mutations in the L22 and L23 ribosomal proteins were identified in 12 and 27 resistant isolates, respectively. Pangenome analysis led to the identification of 79 genes associated with resistance to gamithromycin, of which 95% (75 of 79) had no functional annotation. Most of the observed phenotypic resistance was explained by previously identified antibiotic resistance genes, although resistance to the macrolides gamithromycin and tulathromycin was not explained in 39 of 47 isolates, demonstrating the need for continued surveillance for novel determinants of macrolide resistance.IMPORTANCEBovine respiratory disease is the costliest disease of beef cattle in North America and the most common reason for injectable antibiotic use in beef cattle. Metagenomic sequencing offers the potential to make economically significant reductions in turnaround time for diagnostic information for evidence-based selection of antibiotics for use in the feedlot. The success of diagnostic sequencing depends on a comprehensive catalog of antimicrobial resistance genes and other genome features associated with reduced susceptibility. We analyzed the genome sequences of isolates of Mannheimia haemolytica, a major bovine respiratory disease pathogen, and identified both previously known and novel genes associated with reduced susceptibility to macrolide class antimicrobials. These findings reinforce the need for ongoing surveillance for markers of antimicrobial resistance to support improved diagnostics and antimicrobial stewardship.
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Affiliation(s)
- Darien Deschner
- Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, Canada
| | - Maarten J Voordouw
- Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, Canada
| | - Champika Fernando
- Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, Canada
| | - John Campbell
- Department of Large Animal Clinical Sciences, University of Saskatchewan, Saskatoon, Canada
| | - Cheryl L Waldner
- Department of Large Animal Clinical Sciences, University of Saskatchewan, Saskatoon, Canada
| | - Janet E Hill
- Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, Canada
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Morgan Bustamante BL, Chigerwe M, Martínez-López B, Aly SS, McArthur G, ElAshmawy WR, Fritz H, Williams DR, Wenz J, Depenbrock S. Antimicrobial Susceptibility in Respiratory Pathogens and Farm and Animal Variables in Weaned California Dairy Heifers: Logistic Regression and Bayesian Network Analyses. Antibiotics (Basel) 2024; 13:50. [PMID: 38247609 PMCID: PMC10812578 DOI: 10.3390/antibiotics13010050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 12/21/2023] [Accepted: 12/28/2023] [Indexed: 01/23/2024] Open
Abstract
Weaned dairy heifers are a relatively understudied production group. Bovine respiratory disease (BRD) is the most common cause of antimicrobial drug (AMD) use, morbidity, and mortality in this production group. The study of antimicrobial resistance (AMR) is complicated because many variables that may affect AMR are related. This study generates hypotheses regarding the farm- and animal-level variables (e.g., vaccination, lane cleaning, and AMD use practices) that may be associated with AMR in respiratory isolates from weaned dairy heifers. A cross-sectional study was performed using survey data and respiratory isolates (Pasteurella multocida, Mannheimia haemolytica, and Histophilus somni) collected from 341 weaned dairy heifers on six farms in California. Logistic regression and Bayesian network analyses were used to evaluate the associations between farm- and animal-level variables with minimum inhibitory concentration (MIC) classification of respiratory isolates against 11 AMDs. Farm-level variables associated with MIC classification of respiratory isolates included the number of source farms of a calf-rearing facility, whether the farm practiced onsite milking, the use of lagoon water for flush lane cleaning, and respiratory and pinkeye vaccination practices. Animal-level variables associated with a MIC classification included whether the calf was BRD-score-positive and time since the last phenicol treatment.
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Affiliation(s)
- Brittany L. Morgan Bustamante
- Public Health Sciences, School of Medicine, University of California, Davis, Davis, CA 95616, USA
- Center for Animal Disease Modeling and Surveillance, Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, CA 95616, USA
| | - Munashe Chigerwe
- Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, CA 95616, USA
| | - Beatriz Martínez-López
- Center for Animal Disease Modeling and Surveillance, Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, CA 95616, USA
| | - Sharif S. Aly
- Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California, Davis, Tulare, CA 93274, USA
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, Davis, CA 95616, USA
| | - Gary McArthur
- Swinging Udders Veterinarian Services, Galt, CA 95632, USA
| | - Wagdy R. ElAshmawy
- Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California, Davis, Tulare, CA 93274, USA
- Department of Internal Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Giza 12613, Egypt
| | - Heather Fritz
- California Animal Health and Food Safety Laboratory System, School of Veterinary Medicine, University of California, Davis, Davis, CA 95616, USA
| | - Deniece R. Williams
- Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California, Davis, Tulare, CA 93274, USA
| | - John Wenz
- Field Disease Investigation Unit, College of Veterinary Medicine, Washington State University, Pullman, WA 99163, USA
| | - Sarah Depenbrock
- Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, CA 95616, USA
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Gu G, Pei H, Zhou A, Fan B, Zhou H, Choi A, Huang Z. A Comprehensive Study of Historical Detection Data for Pathogen Isolates from U.S. Cattle. Antibiotics (Basel) 2023; 12:1509. [PMID: 37887210 PMCID: PMC10604524 DOI: 10.3390/antibiotics12101509] [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: 08/23/2023] [Revised: 09/27/2023] [Accepted: 09/28/2023] [Indexed: 10/28/2023] Open
Abstract
Foodborne pathogens pose substantial health hazards and result in considerable economic losses in the U.S. Fortunately, the National Center for Biotechnology Information Pathogen Detection Isolates Browser (NPDIB) provides valuable access to antimicrobial resistance (AMR) genes and antimicrobial assay data. This study aimed to conduct the first comprehensive investigation of AMR genes in pathogens isolated from U.S. cattle over the past decade, driven by the urgent need to address the dangers of AMR specifically originating in pathogens isolated from U.S. cattle. In this study, around 28,000 pathogen isolate samples were extracted from the NPDIB and then analyzed using multivariate statistical methods, mainly principal component analysis (PCA) and hierarchical clustering (H-clustering). These approaches were necessary due to the high dimensions of the raw data. Specifically, PCA was utilized to reduce the dimensions of the data, converting it to a two-dimensional space, and H-clustering was used to better identify the differences among data points. The findings from this work highlighted Salmonella enterica and Escherichia coli as the predominant pathogens among the isolates, with E. coli being the more concerning pathogen due to its increasing prevalence in recent years. Moreover, tetracycline was observed as the most commonly resistant antimicrobial, with the resistance genes mdsA, mdsB, mdtM, blaEC, and acrF being the most prevalent in pathogen isolates from U.S. cattle. The occurrence of mdtM, blaEC, acrF, and glpT_E448k showed an increase in pathogens isolated from U.S. cattle in recent years. Furthermore, based on the data collected for the locations of AMR cases, Texas, California, and Nebraska were the major areas carrying major AMR genes or antimicrobials with detected resistance. The results from this study provide potential directions for targeted interventions to mitigate pathogens' antimicrobial resistance in U.S. cattle.
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Affiliation(s)
| | | | | | | | | | | | - Zuyi Huang
- Department of Chemical and Biological Engineering, Villanova University, Villanova, PA 19085, USA; (G.G.); (H.P.); (A.Z.); (B.F.); (H.Z.); (A.C.)
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Alhamami T, Roy Chowdhury P, Venter H, Veltman T, Truswell A, Abraham S, Sapula SA, Carr M, Djordjevic SP, Trott DJ. Genomic profiling of Pasteurella multocida isolated from feedlot cases of bovine respiratory disease. Vet Microbiol 2023; 283:109773. [PMID: 37201306 DOI: 10.1016/j.vetmic.2023.109773] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 05/05/2023] [Accepted: 05/06/2023] [Indexed: 05/20/2023]
Abstract
Pasteurella multocida causes a range of diseases in many host species throughout the world, including bovine respiratory disease (BRD) which is predominantly seen in feedlot cattle. This study assessed genetic diversity among 139 P. multocida isolates obtained from post-mortem lung swabs of BRD-affected feedlot cattle in four Australian states: New South Wales, Queensland, South Australia, and Victoria during 2014-2019. Whole-genome sequencing (WGS) was used to determine capsular serogroup, lipopolysaccharide genotypes, multi-locus sequence types and phylogenetic relationships. Two capsular types (A and D), with most isolates (132/139; 95%) belonging to type A; and three lipopolysaccharide (LPS) genotypes were identified (L1 [6/139; 4.3%], L3 [124/139; 89.2%] and L6 [9/139; 6.4%)]). Multi-locus sequence types (STs) ST9, ST13, ST17, ST20, ST36, ST50, ST58, ST79, ST124, ST125, ST132, ST167, ST185, ST327, ST394, and three novel STs [ST396, ST397, and ST398] were identified, with ST394 (59/139; 42.4%) and ST79 (44/139; 32%) the most prevalent in all four states. Isolates displaying phenotypic resistance to single, dual or multiple antibiotics (macrolide, tetracycline and aminopenicillins) were predominantly ST394 (23/139; 17%). Laterally mobile elements identified in the resistant ST394 isolates included small plasmids, encoding macrolide and/or tetracycline resistance, distributed in all states; and chromosomally located integrative conjugative elements (ICEs) (4 ST394 and 1 ST125) from the same Queensland feedlot. This study highlights the genomic diversity, epidemiological relationships and AMR associations in bovine P. multocida isolates from Australia and provides insight into the unique ST prevalence compared to other major beef-producing countries.
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Affiliation(s)
- Tamara Alhamami
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, SA 5371, Australia
| | - Piklu Roy Chowdhury
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, NSW 2007, Australia.
| | - Henrietta Venter
- Health and Biomedical Innovation, Clinical & Health Sciences, University of South Australia, Adelaide, SA 5000, Australia
| | - Tania Veltman
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, SA 5371, Australia
| | - Alec Truswell
- Antimicrobial Resistance and Infectious Diseases Laboratory, Harry Butler Institute, Murdoch University, Murdoch, WA 6000, Australia
| | - Sam Abraham
- Antimicrobial Resistance and Infectious Diseases Laboratory, Harry Butler Institute, Murdoch University, Murdoch, WA 6000, Australia
| | - Sylvia A Sapula
- Health and Biomedical Innovation, Clinical & Health Sciences, University of South Australia, Adelaide, SA 5000, Australia
| | - Mandi Carr
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, SA 5371, Australia
| | - Steven P Djordjevic
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Darren J Trott
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, SA 5371, Australia
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Garzon A, Hoyos-Jaramillo A, Hustad S, Byrne BA, Fritz HM, Lehenbauer TW, Aly S, Pereira R. In vitro evaluation of the effect of transport medium, temperature, and time on the recovery of Mannheimia haemolytica and Pasteurella multocida. JDS COMMUNICATIONS 2023; 4:214-218. [PMID: 37360122 PMCID: PMC10285246 DOI: 10.3168/jdsc.2022-0329] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 11/04/2022] [Indexed: 06/28/2023]
Abstract
Appropriate sample collection, storage conditions, and time for transport to the laboratory are important for an accurate diagnostic result. We evaluated the effects of transport storage medium type, time of storage, and storage temperatures on Mannheimia haemolytica (MH) and Pasteurella multocida (PM) recovery using an in vitro model simulation. A quantitative culture method, using colony-forming units per milliliter, was used to recover MH or PM by an in vitro model with cotton swabs. Three independent trials were conducted, in which cotton swabs were inoculated with MH or PM and placed in either (1) a sterile 15-mL polypropylene tube without transport medium (dry), (2) Amies culture medium with charcoal (ACM), or (3) Cary-Blair transport agar (CBA). Swabs were evaluated for recovery of MH or PM when stored at 3 temperatures (4°C, 23°C, or 36°C) and after storage for 8 h, 24 h, or 48 h. From all study group combinations, a total of 162 individual independent swabs were evaluated. The nonparametric Dunn all-pairs approach was used to compare the proportion of culturable bacteria, between the various storage media, temperature, and time point combinations. The proportion of MH in samples stored at 4°C was significantly higher for ACM and CBA than dry storage at 24 and 48 h. The MH samples stored at 36°C had a significantly higher proportion for ACM and CBA than dry storage at 24 h. The proportion of PM in samples stored at 4°C was significantly lower for ACM compared with dry at 8 h but significantly higher at 48 h. The PM samples stored at 23°C in ACM had a significantly higher proportion than dry samples at 24 h, and, at 48 h, ACM and CBA had a significantly higher proportion than the dry group. All swabs stored at 36°C for 48 h had a proportion close to zero, indicating decreasing diagnostic efficacy. These results support the use of transport media such as ACM and CBA for increasing the detection of PM and MH from samples, especially when samples are exposed to high temperatures. The combination of longer periods from collection of samples to diagnostic evaluation (>24 h) and higher storage temperatures (>23°C) were shown to significantly impair diagnostic accuracy.
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Affiliation(s)
- Adriana Garzon
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis 95616
| | - Alejandro Hoyos-Jaramillo
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis 95616
| | - Stephanie Hustad
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis 95616
| | - Barbara A. Byrne
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis 95616
| | - Heather M. Fritz
- California Animal Health and Food Safety Laboratory, University of California, Davis 95616
| | - Terry W. Lehenbauer
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis 95616
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, Tulare 95616
| | - Sharif Aly
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis 95616
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, Tulare 95616
| | - Richard Pereira
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis 95616
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6
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Farghaly M, Hynes MF, Nazari M, Checkley S, Liljebjelke K. Examination of the horizontal gene transfer dynamics of an integrative and conjugative element encoding multidrug resistance in Histophilus somni. Can J Microbiol 2023; 69:123-135. [PMID: 36495587 DOI: 10.1139/cjm-2021-0349] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Integrative and conjugative elements (ICEs) are self-transferable mobile genetic elements that play a significant role in disseminating antimicrobial resistance between bacteria via horizontal gene transfer. A recently identified ICE in a clinical isolate of Histophilus somni (ICEHs02) is 72 914 base pairs in length and harbours seven predicted antimicrobial resistance genes conferring resistance to tetracycline (tetR-tet(H)), florfenicol (floR), sulfonamide (Sul2), aminoglycosides (APH(3″)-Ib, APH(6)-Id, APH(3')-Ia), and copper (mco). This study investigated ICEHs02 host range, assessed effects of antimicrobial stressors on transfer frequency, and examined effects of ICEHs02 acquisition on hosts. Conjugation assays examined transfer frequency of ICEHs02 to H. somni and Pasteurella multocida strains. Polymerase chain reaction assays confirmed the presence of a circular intermediate, ICE-associated core genes, and cargo genes in recipient strains. Susceptibility testing examined ICEHs02-associated resistance phenotypes in recipient strains. Tetracycline and ciprofloxacin induction significantly increased the transfer rates of ICEHs02 in vitro. The copy numbers of the circular intermediate of ICEHs02 per chromosome exhibited significant increases of ∼37-fold after tetracycline exposure and ∼4-fold after ciprofloxacin treatment. The acquisition of ICEHs02 reduced the relative fitness of H. somni transconjugants (TG) by 28% (w = 0.72 ± 0.04) and the relative fitness of P. multocida TG was decreased by 15% (w = 0.85 ± 0.01).
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Affiliation(s)
- Mai Farghaly
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Michael F Hynes
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, AB, Canada
| | - Mohammad Nazari
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Sylvia Checkley
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Karen Liljebjelke
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
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Jobman E, Hagenmaier J, Meyer N, Harper LB, Taylor L, Lukasiewicz K, Thomson D, Lowe J, Terrell S. Cross-Section Observational Study to Assess Antimicrobial Resistance Prevalence among Bovine Respiratory Disease Bacterial Isolates from Commercial US Feedlots. Antibiotics (Basel) 2023; 12:antibiotics12020215. [PMID: 36830126 PMCID: PMC9952279 DOI: 10.3390/antibiotics12020215] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 01/12/2023] [Accepted: 01/16/2023] [Indexed: 01/22/2023] Open
Abstract
Antimicrobial resistance (AMR) is a global public health threat that jeopardizes efficacy of antibiotics in veterinary and human medicine. Antibiotics are commonly administered to target the bacterial component of bovine respiratory disease (BRD). The objectives of this study were to obtain a better understanding of antibiotic resistance in BRD-associated bacteria (Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni), investigate the clinical significance of AMR by monitoring clinical outcomes, and determine if regional differences exist in AMR trends. Deep pharyngeal swabs were used to sample beef cattle at initial BRD diagnosis (n = 453) from US feedlots representing three geographic regions. Organisms were identified by bacterial culture and subjected to broth microdilution antimicrobial susceptibility testing. Bacterium prevalence include P. multocida (36.0%), M. haemolytica (32.7%), and H. somni (28.5%). Of the Histophilus isolates, 39.5% were resistant to at least one antimicrobial, compared to 11.7% and 8.8% Pasteurella and Mannheimia, respectively. Non-susceptibility across all organisms was 5.7 X more likely in animals that received metaphylaxis, than those that did not (p < 0.0001; OR 5.7; CI 2.6-12.5). During days on feed 21-40, non-susceptibility of Histophilus was 8.7 X more likely than Mannheimia (p = 0.0002; OR 8.7; CI 2.8 to 27.4) and 6 X more likely than Pasteurella (p = 0.0016; OR 6.0; CI 2.0-18.0).
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Affiliation(s)
- Erin Jobman
- Production Animal Consultation, P.O. Box 41, Scott City, KS 67748, USA
- Department of Veterinary Clinical Medicine, University of Illinois at Urbana-Champaign, 2001 Lincoln Ave., Urbana, IL 61802, USA
| | - Jacob Hagenmaier
- Veterinary and Biomedical Research Center, 9027 Green Valley Dr., Manhattan, KS 66502, USA
| | - Nathan Meyer
- Boehringer Ingelheim Animal Health USA, 3239 Satellite Blvd NW, Duluth, GA 30096, USA
| | | | - Lisa Taylor
- Production Animal Consultation, P.O. Box 41, Scott City, KS 67748, USA
| | - Kip Lukasiewicz
- Production Animal Consultation, P.O. Box 41, Scott City, KS 67748, USA
| | - Dan Thomson
- Production Animal Consultation, P.O. Box 41, Scott City, KS 67748, USA
| | - James Lowe
- Production Animal Consultation, P.O. Box 41, Scott City, KS 67748, USA
- Department of Veterinary Clinical Medicine, University of Illinois at Urbana-Champaign, 2001 Lincoln Ave., Urbana, IL 61802, USA
| | - Shane Terrell
- Production Animal Consultation, P.O. Box 41, Scott City, KS 67748, USA
- Correspondence:
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Barnewall RJ, Marsh IB, Williams TM, Cusack PMV, Sales N, Galea F, Szentirmay AN, Quinn JC. Efficiency-corrected PCR quantification for identification of prevalence and load of respiratory disease-causing agents in feedlot cattle. Aust Vet J 2022; 100:539-549. [PMID: 36328540 PMCID: PMC9804408 DOI: 10.1111/avj.13200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 07/10/2022] [Accepted: 07/27/2022] [Indexed: 01/05/2023]
Abstract
Bovine respiratory disease (BRD) is the most prevalent disease in feedlot cattle worldwide with Bovine alphaherpesvirus 1 (BoAHV1), Histophilus somni, Mannheimia haemolytica, Mycoplasma bovis, Pasteurella multocida and Trueperella pyogenes accepted to be common etiological agents associated with BRD. Although these agents are common in the upper and lower airways in clinical BRD cases, some also exist as normal flora suggesting their presence in the upper airways alone is not necessarily informative with respect to disease status or risk. To determine the relationship between presence, load and disease status, we investigated the relationship between load in the upper airways at induction and active BRD cases in feedlot cattle using efficiency-corrected PCR quantification. By this approach, we were able to accurately determine the prevalence and load of the key BRD agents in the upper respiratory tract showing that cattle in the hospital pen had a higher prevalence, and load, of these agents both singly and in combination compared to cattle sampled at feedlot induction. A combination of agents was the most accurate indicator of BRD risk with cattle with four or more agents detected in the upper airway more likely to be undergoing treatment for BRD than non-BRD ailments. In addition, M. bovis was rarely detected at feedlot induction but was identified at high prevalence in cattle in the hospital pen. These findings present a potential new technological approach for the investigation, analysis and identification of BRD-associated viral and bacterial agents for Australian feedlot systems as well as for BRD disease management and treatment.
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Affiliation(s)
- RJ Barnewall
- School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt UniversityLocked Bag 588Wagga WaggaNew South Wales2678Australia,Gulbali Institute for Agriculture, Water and the EnvironmentWagga WaggaNew South Wales2678Australia
| | - IB Marsh
- NSW DPI, Elizabeth Macarthur Agricultural InstitutePMB 4008NarellanNew South Wales2567Australia
| | - TM Williams
- School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt UniversityLocked Bag 588Wagga WaggaNew South Wales2678Australia,Gulbali Institute for Agriculture, Water and the EnvironmentWagga WaggaNew South Wales2678Australia,Present address:
School of Health, Medical and Applied Sciences, Central Queensland University554‐700 Yaamba Road, Norman GardensRockhamptonQueensland4701Australia
| | - PMV Cusack
- School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt UniversityLocked Bag 588Wagga WaggaNew South Wales2678Australia,Australian Livestock Production ServicesCowraNew South Wales2794Australia
| | - N Sales
- NSW DPI, Elizabeth Macarthur Agricultural InstitutePMB 4008NarellanNew South Wales2567Australia
| | - F Galea
- NSW DPI, Elizabeth Macarthur Agricultural InstitutePMB 4008NarellanNew South Wales2567Australia
| | - AN Szentirmay
- Gene Target Solutions Pty Ltd, Unit 3CBuilding 4, 256B New Line RoadDuralNew South Wales2158Australia
| | - JC Quinn
- School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt UniversityLocked Bag 588Wagga WaggaNew South Wales2678Australia,Gulbali Institute for Agriculture, Water and the EnvironmentWagga WaggaNew South Wales2678Australia
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9
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Ueno Y, Suzuki K, Takamura Y, Hoshinoo K, Takamatsu D, Katsuda K. Antimicrobial resistance and associated genetic background of Histophilus somni isolated from clinically affected and healthy cattle. Front Vet Sci 2022; 9:1040266. [PMID: 36387383 PMCID: PMC9645265 DOI: 10.3389/fvets.2022.1040266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Accepted: 10/03/2022] [Indexed: 11/24/2022] Open
Abstract
Histophilus somni, a member of the Pasteurellaceae family, causes various diseases, including thrombotic meningoencephalitis and respiratory diseases. Here, 166 isolates recovered from Japanese cattle with various diseases between the late 1970s and the 2010s were subjected to susceptibility testing against 14 antimicrobials (ampicillin, amoxicillin, cefazolin, ceftiofur, kanamycin, streptomycin, nalidixic acid, enrofloxacin, danofloxacin, florfenicol, erythromycin, tylosin, oxytetracycline, and fosfomycin). The proportions of antimicrobial-resistant/intermediate isolates were low in the total isolates, with resistance rates ranging from 0% for ceftiofur and florfenicol to 13.2% for ampicillin. However, relatively high minimum inhibitory concentrations (MICs) and resistance/intermediate rates were observed in the isolates from cattle with respiratory diseases; i.e., 21/53 isolates (39.6%) showed resistance or intermediate to one or more antimicrobials for treatment of respiratory diseases, and the resistance/intermediate rates to oxytetracycline, kanamycin, ampicillin, amoxicillin, nalidixic acid, and danofloxacin were 28.3, 24.5, 24.5, 13.2, 1.9, and 1.9%, respectively. Isolates with high MICs tended to possess antimicrobial resistance genes, which may confer antimicrobial resistance phenotypes. In particular, all isolates with MICs of ampicillin/amoxicillin, kanamycin, and oxytetracycline ≥2 μg/mL, ≥512 μg/mL, and ≥4 μg/mL possessed blaROB − 1, aphA-1, and tetH/tetR, respectively, whereas isolates whose MICs were lower than the above-mentioned values did not possess these resistance genes. These results suggest that the resistance genes detected in this study are primarily responsible for the reduced susceptibility of H. somni strains to these antimicrobials. As integrative and conjugative element (ICEs)-associated genes were detected only in genetically related isolates possessing antimicrobial resistance genes, ICEs may play an important role in the spread of resistance genes in some genetic groups of H. somni strains.
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Affiliation(s)
- Yuichi Ueno
- Division of Infectious Animal Disease Research, National Institute of Animal Health, National Agriculture and Food Research Organization, NARO, Tsukuba, Japan
- *Correspondence: Yuichi Ueno
| | - Kenta Suzuki
- Nagano Prefectural Matsumoto Livestock Hygiene Service Center, Matsumoto, Japan
| | - Yuji Takamura
- Aichi Prefectural Chuo Livestock Hygiene Service Center, Okazaki, Japan
| | - Kaori Hoshinoo
- Division of Infectious Animal Disease Research, National Institute of Animal Health, National Agriculture and Food Research Organization, NARO, Tsukuba, Japan
| | - Daisuke Takamatsu
- Division of Infectious Animal Disease Research, National Institute of Animal Health, National Agriculture and Food Research Organization, NARO, Tsukuba, Japan
- The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan
| | - Ken Katsuda
- National Institute of Animal Health, National Agriculture and Food Research Organization, NARO, Tsukuba, Japan
- Ken Katsuda
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10
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Groves JT, Goldsmith TJ, Carlson JM. How Forces of a Complex Adaptive System Affect Ability to Control Bovine Respiratory Disease in Feeder Cattle. Vet Clin North Am Food Anim Pract 2022; 38:295-316. [PMID: 35691630 DOI: 10.1016/j.cvfa.2022.02.006] [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: 10/18/2022] Open
Abstract
This chapter provides an introductory look into the practical application of the principals of systems thinking as a methodology to gain deeper understanding of the nature of bovine respiratory disease (BRD) in current North American beef production models. The "limits to success" archetype is used to explore the dynamic relationship between technological BRD mitigation improvements and the resultant adaptive changes made by the system. The chapter concludes, by using the tragedy of the common archetype, with an investigation into how the common shared resource of antimicrobials can be damaged and depleted over time.
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Affiliation(s)
- John T Groves
- Livestock Veterinary Service, 917 South Aurora/ PO Box 353, Eldon, MO 65026, USA.
| | - Timothy J Goldsmith
- College of Veterinary Medicine, University of Minnesota, 225 Veterinary Medical Center, 1365 Gortner Avenue, St Paul, MN 55108, USA
| | - Jaden M Carlson
- University of Nebraska, School of Veterinary and Biomedical Sciences, Great Plains Veterinary Educational Center, 820 Road 313/ PO Box 148, Clay Center, NE 68933, USA
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11
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Freeman CN, Herman EK, Abi Younes J, Ramsay DE, Erikson N, Stothard P, Links MG, Otto SJG, Waldner C. Evaluating the potential of third generation metagenomic sequencing for the detection of BRD pathogens and genetic determinants of antimicrobial resistance in chronically ill feedlot cattle. BMC Vet Res 2022; 18:211. [PMID: 35655189 PMCID: PMC9161498 DOI: 10.1186/s12917-022-03269-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 04/26/2022] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Bovine respiratory disease (BRD) is an important cause of morbidity and mortality and is responsible for most of the injectable antimicrobial use in the feedlot industry. Traditional bacterial culture can be used to diagnose BRD by confirming the presence of causative pathogens and to support antimicrobial selection. However, given that bacterial culture takes up to a week and early intervention is critical for treatment success, culture has limited utility for informing rapid therapeutic decision-making. In contrast, metagenomic sequencing has the potential to quickly resolve all nucleic acid in a sample, including pathogen biomarkers and antimicrobial resistance genes. In particular, third-generation Oxford Nanopore Technology sequencing platforms provide long reads and access to raw sequencing data in real-time as it is produced, thereby reducing the time from sample collection to diagnostic answer. The purpose of this study was to compare the performance of nanopore metagenomic sequencing to traditional culture and sensitivity methods as applied to nasopharyngeal samples from segregated groups of chronically ill feedlot cattle, previously treated with antimicrobials for nonresponsive pneumonia or lameness.
Results
BRD pathogens were isolated from most samples and a variety of different resistance profiles were observed across isolates. The sequencing data indicated the samples were dominated by Moraxella bovoculi, Mannheimia haemolytica, Mycoplasma dispar, and Pasteurella multocida, and included a wide range of antimicrobial resistance genes (ARGs), encoding resistance for up to seven classes of antimicrobials. Genes conferring resistance to beta-lactams were the most commonly detected, while the tetH gene was detected in the most samples overall. Metagenomic sequencing detected the BRD pathogens of interest more often than did culture, but there was limited concordance between phenotypic resistance to antimicrobials and the presence of relevant ARGs.
Conclusions
Metagenomic sequencing can reduce the time from sampling to results, detect pathogens missed by bacterial culture, and identify genetically encoded determinants of resistance. Increasing sequencing coverage of target organisms will be an essential component of improving the reliability of this technology, such that it can be better used for the surveillance of pathogens of interest, genetic determinants of resistance, and to inform diagnostic decisions.
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12
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Carter HF, Wills RW, Scott MA, Thompson AC, Singer RS, Loy JD, Karisch BB, Epperson WB, Woolums AR. Assessment of Diversity of Antimicrobial Resistance Phenotypes and Genotypes of Mannheimia haemolytica Isolates From Bovine Nasopharyngeal Swabs. Front Vet Sci 2022; 9:883389. [PMID: 35647109 PMCID: PMC9132175 DOI: 10.3389/fvets.2022.883389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 04/15/2022] [Indexed: 11/18/2022] Open
Abstract
The threat of bovine respiratory disease (BRD) for cattle operations is exacerbated by increasing prevalence of antimicrobial resistance (AMR) in Mannheimia haemolytica, a leading cause of BRD. Characterization of AMR in M. haemolytica by culture and susceptibility testing is complicated by uncertainty regarding the number of colonies that must be selected to accurately characterize AMR phenotypes (antibiograms) and genotypes in a culture. The study objective was to assess phenotypic and genotypic diversity of M. haemolytica isolates on nasopharyngeal swabs (NPS) from 28 cattle at risk for BRD or with BRD. NPS were swabbed onto five consecutive blood agar plates; after incubation up to 20 M. haemolytica colonies were selected per plate (up to 100 colonies per NPS). Phenotype was determined by measuring minimum inhibitory concentrations (MIC) for 11 antimicrobials and classifying isolates as resistant or not. Genotype was indirectly determined by matrix-assisted laser desorption/ionization time of flight mass spectroscopy (MALDI-TOF MS). NPS from 11 of 28 cattle yielded at least one M. haemolytica isolate; median (range) of isolates per NPS was 48 (1-94). NPS from seven cattle yielded one phenotype, 3 NPS yielded two, and 1 NPS yielded three; however, within a sample all phenotypic differences were due to only one MIC dilution. On each NPS all M. haemolytica isolated were the same genotype; genotype 1 was isolated from three NPS and genotype two was isolated from eight. Diversity of M. haemolytica on bovine NPS was limited, suggesting that selection of few colonies might adequately identify relevant phenotypes and genotypes.
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Affiliation(s)
- Hannah F. Carter
- Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Starkville, MS, United States
| | - Robert W. Wills
- Department of Comparative Biomedical Sciences, College of Veterinary Medicine, Mississippi State University, Starkville, MS, United States
| | - Matthew A. Scott
- Veterinary Education, Research, and Outreach Center, Texas A&M University and West Texas A&M University, Canyon, TX, United States
| | - Alexis C. Thompson
- Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Starkville, MS, United States
| | - Randall S. Singer
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, United States
| | - John Dustin Loy
- School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE, United States
| | - Brandi B. Karisch
- Department of Animal and Dairy Science, College of Agriculture and Life Sciences, Mississippi State University, Starkville, MS, United States
| | - William B. Epperson
- Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Starkville, MS, United States
| | - Amelia R. Woolums
- Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Starkville, MS, United States
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13
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In-vitro antibiotic resistance phenotypes of respiratory and enteric bacterial isolates from weaned dairy heifers in California. PLoS One 2021; 16:e0260292. [PMID: 34818352 PMCID: PMC8612539 DOI: 10.1371/journal.pone.0260292] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 11/05/2021] [Indexed: 11/19/2022] Open
Abstract
Antimicrobial drug (AMD) use for bovine respiratory disease (BRD) continues to be concerning for development of antimicrobial resistance (AMR) in respiratory and enteric bacteria of cattle. This study aimed to provide data regarding AMR in respiratory isolates, and identify relationships between respiratory and enteric AMD susceptibility, in weaned dairy heifers. A cross-sectional study was performed between June of 2019 and February 2020, on 6 calf rearing facilities in California. Deep nasopharyngeal and rectal swabs were collected from 341 weaned heifers and submitted for selective bacterial culture and AMR testing. Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni were selectively isolated from respiratory samples; Escherichia coli and Enterococcus spp. were selectively isolated from rectal swabs. Minimum inhibitory concentrations (MIC) were determined for selected isolates against 19 AMD. The proportion of resistant isolates was calculated using Clinical Laboratory Standards Institute (respiratory) or USDA NARMS (enteric) breakpoints; when no applicable breakpoint was available, the distribution of MIC was described and compared. Association between AMR in a calf’s respiratory isolate and a higher or lower MIC of the matched enteric isolates was determined. More than 50% of P. multocida isolates were resistant to each of 7 AMD commonly used to treat BRD (florfenicol, gamithromycin, tildipirosin, tilmicosin, danofloxacin, enrofloxacin and tetracycline). Resistance in respiratory isolates was only associated with higher matched enteric MIC for gamithromycin and tulathromycin. Multidrug resistance was reported in >70% of P. multocida and M. haemolytica isolates. Antimicrobial resistance, including multidrug resistance, in respiratory isolates appears to be widespread in weaned dairy heifers; this finding has not previously been reported and raises concern for the future efficacy of AMD used to treat respiratory diseases in weaned dairy heifers. Enteric bacterial MIC appear to have limited direct association with respiratory isolate AMR classification.
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14
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Andrés-Lasheras S, Ha R, Zaheer R, Lee C, Booker CW, Dorin C, Van Donkersgoed J, Deardon R, Gow S, Hannon SJ, Hendrick S, Anholt M, McAllister TA. Prevalence and Risk Factors Associated With Antimicrobial Resistance in Bacteria Related to Bovine Respiratory Disease-A Broad Cross-Sectional Study of Beef Cattle at Entry Into Canadian Feedlots. Front Vet Sci 2021; 8:692646. [PMID: 34277758 PMCID: PMC8280473 DOI: 10.3389/fvets.2021.692646] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 05/31/2021] [Indexed: 11/13/2022] Open
Abstract
A broad, cross-sectional study of beef cattle at entry into Canadian feedlots investigated the prevalence and epidemiology of antimicrobial resistance (AMR) in Mannheimia haemolytica, Pasteurella multocida, Histophilus somni, and Mycoplasma bovis, bacterial members of the bovine respiratory disease (BRD) complex. Upon feedlot arrival and before antimicrobials were administered at the feedlot, deep nasopharyngeal swabs were collected from 2,824 feedlot cattle in southern and central Alberta, Canada. Data on the date of feedlot arrival, cattle type (beef, dairy), sex (heifer, bull, steer), weight (kg), age class (calf, yearling), source (ranch direct, auction barn, backgrounding operations), risk of developing BRD (high, low), and weather conditions at arrival (temperature, precipitation, and estimated wind speed) were obtained. Mannheimia haemolytica, P. multocida, and H. somni isolates with multidrug-resistant (MDR) profiles associated with the presence of integrative and conjugative elements were isolated more often from dairy-type than from beef-type cattle. Our results showed that beef-type cattle from backgrounding operations presented higher odds of AMR bacteria as compared to auction-derived calves. Oxytetracycline resistance was the most frequently observed resistance across all Pasteurellaceae species and cattle types. Mycoplasma bovis exhibited high macrolide minimum inhibitory concentrations in both cattle types. Whether these MDR isolates establish and persist within the feedlot environment, requires further evaluation.
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Affiliation(s)
- Sara Andrés-Lasheras
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada
| | - Reuben Ha
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada
| | - Rahat Zaheer
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada
| | - Catrione Lee
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada
| | | | - Craig Dorin
- Veterinary Agri-Health Systems, Airdrie, AB, Canada
| | | | - Rob Deardon
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada.,Department of Mathematics and Statistics, University of Calgary, Calgary, AB, Canada
| | - Sheryl Gow
- Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada.,Public Health Agency of Canada, Saskatoon, SK, Canada
| | | | | | - Michele Anholt
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada.,POV Inc., Airdrie, AB, Canada
| | - Tim A McAllister
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada
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15
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Kudirkiene E, Aagaard AK, Schmidt LMB, Pansri P, Krogh KM, Olsen JE. Occurrence of major and minor pathogens in calves diagnosed with bovine respiratory disease. Vet Microbiol 2021; 259:109135. [PMID: 34090248 DOI: 10.1016/j.vetmic.2021.109135] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 05/25/2021] [Indexed: 11/26/2022]
Abstract
Bovine respiratory disease (BRD) is caused by a mixture of viruses and opportunistic bacteria belonging to Pasteurellaceae and Mycoplasma bovis. However, these organisms are also commonly isolated from healthy calves. This study aimed to determine whether the organisms are present in higher numbers in calves sick with acute BRD than in clinically healthy calves, and further to genetically characterize bacteria of the family Pasteurellaceae to understand whether particular types are associated with disease. Forty-six clinically healthy and 46 calves with BRD were sampled by broncheoalveolar lavage (BAL) method in 11 herds geographically spread over Denmark to determine presence and quantity of microorganisms by culture and quantitative real time qPCR. Isolates of Pasteurellaceae were tested for antibiotic resistance and were whole genome sequenced to determine genotypes. Histophilus somni was in particular positively associated with BRD, suggesting particular importance of this organism as likely aetiology of BRD. In addition, quantification of bacteria revealed that higher counts of H. somni as well as of M. haemolytica was also a good indicator of the disease. Pasteurellaceae isolates were susceptible to the commonly used antibiotics in treatment of BRD, and genotypes were shared between isolates from clinically healthy and sick calves.
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Affiliation(s)
- Egle Kudirkiene
- Department of Veterinary and Animal Science University of Copenhagen, Copenhagen, Denmark
| | - Anne Katrine Aagaard
- Department of Veterinary and Animal Science University of Copenhagen, Copenhagen, Denmark
| | - Louise M B Schmidt
- Department of Veterinary and Animal Science University of Copenhagen, Copenhagen, Denmark
| | | | | | - John E Olsen
- Department of Veterinary and Animal Science University of Copenhagen, Copenhagen, Denmark.
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16
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Virulence Determinants and Antimicrobial Profiles of Pasteurella multocida Isolated from Cattle and Humans in Egypt. Antibiotics (Basel) 2021; 10:antibiotics10050480. [PMID: 33921977 PMCID: PMC8143532 DOI: 10.3390/antibiotics10050480] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 04/12/2021] [Accepted: 04/15/2021] [Indexed: 11/24/2022] Open
Abstract
Pasteurella multocida is a Gram-negative bacterium that causes drastic infections in cattle and humans. In this study, 55 isolates were recovered from 115 nasal swabs from apparently healthy and diseased cattle and humans in Minufiya and Qalyubia, Egypt. These isolates were confirmed by kmt1 existence, and molecular classification of the capsular types showed that types B, D, and E represented 23/55 (41.8%), 21/55 (38.1%), and 11/55 (20.0%), respectively. The isolates were screened for five virulence genes with hgbA, hgbB, and ptfA detected in 28/55 (50.9%), 30/55 (54.5%), and 25/55 (45.5%), respectively. We detected 17 capsular and virulence gene combinations with a discriminatory power (DI) of 0.9286; the most prevalent profiles were dcbF type D and dcbF type D, hgbA, hgbB, and ptfA, which represented 8/55 (14.5%) each. These strains exhibited high ranges of multiple antimicrobial resistance indices; the lowest resistances were against chloramphenicol, ciprofloxacin, amoxicillin/clavulanic acid, and levofloxacin. The macrolide–lincosamide–streptogramin B methylase gene erm(Q), with erm(42) encoding MLSB monomethyltransferase, mph(E) encoding a macrolide efflux pump, and msr(E) encoding macrolide-inactivating phosphotransferase were present. The class 1 and 2 integrons and extended-spectrum β-lactamase genes intl1, intl2, blaCTX-M, blaCTX-M-1, and blaTEM were detected. It is obvious to state that co-occurrence of resistance genes resulted in multiple drug-resistant phenotypes. The identified isolates were virulent, genetically diverse, and resistant to antimicrobials, highlighting the potential risk to livestock and humans.
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17
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Dutta E, Loy JD, Deal CA, Wynn EL, Clawson ML, Clarke J, Wang B. Development of a Multiplex Real-Time PCR Assay for Predicting Macrolide and Tetracycline Resistance Associated with Bacterial Pathogens of Bovine Respiratory Disease. Pathogens 2021; 10:pathogens10010064. [PMID: 33450871 PMCID: PMC7828349 DOI: 10.3390/pathogens10010064] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/05/2021] [Accepted: 01/12/2021] [Indexed: 11/16/2022] Open
Abstract
Antimicrobial resistance (AMR) in bovine respiratory disease (BRD) is an emerging concern that may threaten both animal and public health. Rapid and accurate detection of AMR is essential for prudent drug therapy selection during BRD outbreaks. This study aimed to develop a multiplex quantitative real-time polymerase chain reaction assay (qPCR) to provide culture-independent information regarding the phenotypic AMR status of BRD cases and an alternative to the gold-standard, culture-dependent test. Bovine clinical samples (297 lung and 111 nasal) collected in Nebraska were subjected to qPCR quantification of macrolide (MAC) and tetracycline (TET) resistance genes and gold-standard determinations of AMR of BRD pathogens. Receiver operating characteristic curve analysis was used to classify AMR based on the qPCR results. For lung tissues, the qPCR method showed good agreement with the gold-standard test for both MACs and TETs, with a sensitivity of 67–81% and a specificity higher than 80%. For nasal swabs, qPCR results passed validation criteria only for TET resistance detection, with a sensitivity of 88%, a specificity of 80% and moderate agreement. The culture-independent assay developed here provides the potential for more rapid AMR characterization of BRD cases directly from clinical samples at equivalent accuracy and higher time efficiency compared with the gold-standard, culture-based test.
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Affiliation(s)
- Enakshy Dutta
- Department of Statistics, University of Nebraska-Lincoln, Lincoln, NE 68583, USA; (E.D.); (J.C.)
| | - John Dustin Loy
- School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, USA; (J.D.L.); (C.A.D.)
| | - Caitlyn A. Deal
- School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, USA; (J.D.L.); (C.A.D.)
| | - Emily L. Wynn
- U.S. Meat Animal Research Center, Agricultural Research Service, United States Department of Agriculture, Clay Center, NE 68933, USA; (E.L.W.); (M.L.C.)
| | - Michael L. Clawson
- U.S. Meat Animal Research Center, Agricultural Research Service, United States Department of Agriculture, Clay Center, NE 68933, USA; (E.L.W.); (M.L.C.)
| | - Jennifer Clarke
- Department of Statistics, University of Nebraska-Lincoln, Lincoln, NE 68583, USA; (E.D.); (J.C.)
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - Bing Wang
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
- Correspondence: ; Tel.: +1-(402)-472-2517
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18
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Bovine respiratory disease in beef calves supported long transport stress: An epidemiological study and strategies for control and prevention. Res Vet Sci 2020; 135:450-455. [PMID: 33203584 DOI: 10.1016/j.rvsc.2020.11.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 09/30/2020] [Accepted: 11/03/2020] [Indexed: 11/24/2022]
Abstract
BRD is associated with infectious agents, but management and transport-stress are trigger factors. Metaphylactic administration of antimicrobial reduces colonization of respiratory tract by pathogens, but the development of antibiotic-resistance raises public health concerns leading to propose new control strategies. The study analyzed nasopharyngeal swabs of 231 imported cattle, 10% of 49 trucks, transported from France to southern Italy and, through Real-time PCR identified the prevalence of the involved pathogens speculating on strategies to reduce the impact of BRD. The samples were tested by Real-time PCR, for the detection of bovine coronavirus (BCoV), bovine respiratory syncytial virus (BRSV), bovine parainfluenza virus (BPiV), bovine adenovirus (BAdV), Mannheimia haemolytica, Pasteurella multocida, Histophilus somni, and Mycoplasma bovis. Yates-corrected chi squared, or Fisher's exact test were used to compare both animal-health status and positivity/negativity to pathogens, and the relationship between presence/absence of clinical signs and Real-time PCR-positivity. H. somni and BCoV were the most frequently identified pathogens. In BRD-diagnosed cattle, BAdV was detected in 13.8% (19/138), BRSV in 14.5% (20/138) and BPiV in 4.3% (6/138). Healthy cattle were mostly positive for H. somni (89.2%, 83/93). A statistically significant association was observed between clinical signs and positivity to M. haemolytica (p value = 0.016). Although mass-medication and vaccination are used for BRD control, it still remains a primary health problem. Our results highlight that the nasopharyngeal microbiota could be affected by transport and that strategies to enhance calf immunity for reducing BRD-risk development would be more effective if applied at farm of origin prior to loading.
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19
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Barberato-Filho S, Bergamaschi CDC, Del Fiol FDS, Antoniazzi FB, Stievano JM, Justo AC, Souza CDP, Silva MT. [Methicillin-resistant Staphylococcus aureus in the Americas: systematic review and metanalysis of prevalence in food-producing animals Staphylococcus aureus resistente a la meticilina en la Región de las Américas: revisión sistemática y metanálisis de la prevalencia en la actividad agropecuaria]. Rev Panam Salud Publica 2020; 44:e48. [PMID: 32973900 PMCID: PMC7498297 DOI: 10.26633/rpsp.2020.48] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 03/11/2020] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVE To determine the prevalence of methicillin-resistant Staphylococcus aureus (MRSA) in animals used to produce foods in the Americas. METHOD A systematic literature review was performed in the following databases: Scopus, Web of Science, MEDLINE, EMBASE, and Virtual Health Library. Articles published in the past 10 years, without language limits, were selected. The outcome of interest was the prevalence of MRSA in food-producing animals. Prevalence rates were meta-analyzed in grouped random effects models using the DerSimonian and Laird method. The geographic distribution of MRSA and the time trend of resistance were also analyzed. RESULTS Of 19 studies included, 11 were performed in the United States and 11 analyzed pig samples. Five studies were performed in South America. The samples analyzed in the studies were collected in farming, processing, and retail sites. MRSA prevalence in the Americas was 7.6% (95%CI: 5.6-9.5%), and was higher in pigs [12.6% (95%CI: 7.0-18.2%)] followed by bovine cattle [2.4% (95%CI: 1.2-3.7%)] and poultry [1.8% (95CI%: 0.3-3.4%)]. MRSA prevalence was higher in pigs in North America and bovine cattle in Latin America. There was no significant variation in MRSH prevalence along the 10-year period analyzed. CONCLUSIONS MRSA prevalence in food-producing animals in the Americas was higher in pigs, without significant changes across time.
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Affiliation(s)
- Silvio Barberato-Filho
- Universidade de Sorocaba, Programa de Pós-Graduação em Ciências FarmacêuticasSorocaba (SP)BrasilUniversidade de Sorocaba, Programa de Pós-Graduação em Ciências Farmacêuticas, Sorocaba (SP), Brasil.
| | - Cristiane de Cássia Bergamaschi
- Universidade de Sorocaba, Programa de Pós-Graduação em Ciências FarmacêuticasSorocaba (SP)BrasilUniversidade de Sorocaba, Programa de Pós-Graduação em Ciências Farmacêuticas, Sorocaba (SP), Brasil.
| | - Fernando de Sá Del Fiol
- Universidade de Sorocaba, Programa de Pós-Graduação em Ciências FarmacêuticasSorocaba (SP)BrasilUniversidade de Sorocaba, Programa de Pós-Graduação em Ciências Farmacêuticas, Sorocaba (SP), Brasil.
| | - Felipe Bernardini Antoniazzi
- Universidade de Sorocaba, Programa de Pós-Graduação em Ciências FarmacêuticasSorocaba (SP)BrasilUniversidade de Sorocaba, Programa de Pós-Graduação em Ciências Farmacêuticas, Sorocaba (SP), Brasil.
| | - Julia Módolo Stievano
- Universidade de Sorocaba, Programa de Pós-Graduação em Ciências FarmacêuticasSorocaba (SP)BrasilUniversidade de Sorocaba, Programa de Pós-Graduação em Ciências Farmacêuticas, Sorocaba (SP), Brasil.
| | - Ana Celine Justo
- Universidade de Sorocaba, Programa de Pós-Graduação em Ciências FarmacêuticasSorocaba (SP)BrasilUniversidade de Sorocaba, Programa de Pós-Graduação em Ciências Farmacêuticas, Sorocaba (SP), Brasil.
| | - Camila de Paula Souza
- Universidade de Sorocaba, Programa de Pós-Graduação em Ciências FarmacêuticasSorocaba (SP)BrasilUniversidade de Sorocaba, Programa de Pós-Graduação em Ciências Farmacêuticas, Sorocaba (SP), Brasil.
| | - Marcus Tolentino Silva
- Universidade de Sorocaba, Programa de Pós-Graduação em Ciências FarmacêuticasSorocaba (SP)BrasilUniversidade de Sorocaba, Programa de Pós-Graduação em Ciências Farmacêuticas, Sorocaba (SP), Brasil.
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20
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Hu G, Do DN, Gray J, Miar Y. Selection for Favorable Health Traits: A Potential Approach to Cope with Diseases in Farm Animals. Animals (Basel) 2020; 10:E1717. [PMID: 32971980 PMCID: PMC7552752 DOI: 10.3390/ani10091717] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 09/21/2020] [Indexed: 12/17/2022] Open
Abstract
Disease is a global problem for animal farming industries causing tremendous economic losses (>USD 220 billion over the last decade) and serious animal welfare issues. The limitations and deficiencies of current non-selection disease control methods (e.g., vaccination, treatment, eradication strategy, genome editing, and probiotics) make it difficult to effectively, economically, and permanently eliminate the adverse influences of disease in the farm animals. These limitations and deficiencies drive animal breeders to be more concerned and committed to dealing with health problems in farm animals by selecting animals with favorable health traits. Both genetic selection and genomic selection contribute to improving the health of farm animals by selecting certain health traits (e.g., disease tolerance, disease resistance, and immune response), although both of them face some challenges. The objective of this review was to comprehensively review the potential of selecting health traits in coping with issues caused by diseases in farm animals. Within this review, we highlighted that selecting health traits can be applied as a method of disease control to help animal agriculture industries to cope with the adverse influences caused by diseases in farm animals. Certainly, the genetic/genomic selection solution cannot solve all the disease problems in farm animals. Therefore, management, vaccination, culling, medical treatment, and other measures must accompany selection solution to reduce the adverse impact of farm animal diseases on profitability and animal welfare.
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Affiliation(s)
| | | | | | - Younes Miar
- Department of Animal Science and Aquaculture, Dalhousie University, Truro, NS B2N 5E3, Canada; (G.H.); (D.N.D.); (J.G.)
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The pathogen Mycoplasma dispar Shows High Minimum Inhibitory Concentrations for Antimicrobials Commonly Used for Bovine Respiratory Disease. Antibiotics (Basel) 2020; 9:antibiotics9080460. [PMID: 32751401 PMCID: PMC7459706 DOI: 10.3390/antibiotics9080460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/10/2020] [Accepted: 07/25/2020] [Indexed: 11/17/2022] Open
Abstract
Mycoplasma dispar is an overlooked pathogen often involved in bovine respiratory disease (BRD), which affects cattle around the world. BRD results in lost production and high treatment and prevention costs. Additionally, chronic therapies with multiple antimicrobials may lead to antimicrobial resistance. Data on antimicrobial susceptibility to M. dispar is limited so minimum inhibitory concentrations (MIC) of a range of antimicrobials routinely used in BRD were evaluated using a broth microdilution technique for 41 M. dispar isolates collected in Italy between 2011–2019. While all isolates had low MIC values for florfenicol (<1 μg/mL), many showed high MIC values for erythromycin (MIC90 ≥8 μg/mL). Tilmicosin MIC values were higher (MIC50 = 32 μg/mL) than those for tylosin (MIC50 = 0.25 μg/mL). Seven isolates had high MIC values for lincomycin, tilmicosin and tylosin (≥32 μg/mL). More, alarmingly, results showed more than half the strains had high MICs for enrofloxacin, a member of the fluoroquinolone class considered critically important in human health. A time-dependent progressive drift of enrofloxacin MICs towards high-concentration values was observed, indicative of an on-going selection process among the isolates.
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22
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Van Driessche L, De Neve C, Haesebrouck F, van Leenen K, Boyen F, Pardon B. Storage time and temperature affect the isolation rate of Mannheimia haemolytica and Pasteurella multocida from bovine bronchoalveolar lavage samples. BMC Vet Res 2020; 16:238. [PMID: 32660585 PMCID: PMC7359580 DOI: 10.1186/s12917-020-02456-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 07/06/2020] [Indexed: 11/18/2022] Open
Abstract
Background A microbiological diagnosis is essential to better target antimicrobial treatment, control and prevention of respiratory tract infections in cattle. Under field conditions, non-endoscopic broncho-alveolar lavage (nBAL) samples are increasingly collected. To what extent the highly variable turnaround time and storage temperatures between sampling and cultivation affect the isolation rate of bacterial pathogens is unknown. Therefore, the objective of this experimental study was to determine the effect of different storage temperatures (0 °C, 8 °C, 23 °C and 36 °C) and times (0,2,4,6,8,24,48 h) on the isolation rate and concentration of Pasteurellaceae in nBAL samples from clinically affected animals. Results At a storage temperature temperature of 36 °C isolation rates of Mannheimia haemolytica and Pasteurella multocida were significantly reduced 6 h and 48 h after sampling, respectively. At room temperature (23 °C), a decrease in M. haemolytica and P. multocida isolation rate was noticed, starting at 24 and 48 h after sampling, respectively, but only significant for P. multocida at 48 h. The presence of microbial contamination negatively affected the isolation of P. multocida in clinical nBAL samples, but not of M. haemolytica. Conclusion Optimal M. haemolytica and P. multocida isolation rates from clinical nBAL samples are obtained after storage at 0 °C or 8 °C, provided that the sample is cultivated within 24 h after sampling. The maximum period a sample can be stored without an effect on the M. haemolytica and P. multocida isolation success varies and is dependent on the storage temperature and the degree of microbial contamination.
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Affiliation(s)
- Laura Van Driessche
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium.
| | - Charlotte De Neve
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium
| | - Freddy Haesebrouck
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium
| | - Katharina van Leenen
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium
| | - Filip Boyen
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium
| | - Bart Pardon
- Department of Large Animal Internal Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium
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23
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Bovine Respiratory Disease Treatment Failure: Impact and Potential Causes. Vet Clin North Am Food Anim Pract 2020; 36:487-496. [PMID: 32451037 DOI: 10.1016/j.cvfa.2020.03.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Bovine respiratory disease (BRD) is often attributed to complex interactions between the host, pathogen, and the environment. Likewise, many BRD treatment failures result from interactions between the host, pathogen, environment, drug, and drug administrator. Investigating and addressing the underlying causes of BRD treatment failures can improve clinical outcomes and animal welfare of future cases, improve morale of employees, reduce direct costs of dealing with BRD treatment failures, refine antimicrobial prescribing practices, and advance antimicrobial stewardship. This article discusses these interactions and provides guidance to veterinary practitioners on evaluating the success of treatment protocols.
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24
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A systematic review and network meta-analysis of injectable antibiotic options for the control of bovine respiratory disease in the first 45 days post arrival at the feedlot. Anim Health Res Rev 2020; 20:163-181. [PMID: 32081117 DOI: 10.1017/s1466252320000031] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We conducted a systematic review and network meta-analysis to determine the comparative efficacy of antibiotics used to control bovine respiratory disease (BRD) in beef cattle on feedlots. The information sources for the review were: MEDLINE®, MEDLINE In-Process and MEDLINE® Daily, AGRICOLA, Epub Ahead of Print, Cambridge Agricultural and Biological Index, Science Citation Index, Conference Proceedings Citation Index - Science, the Proceedings of the American Association of Bovine Practitioners, World Buiatrics Conference, and the United States Food and Drug Administration Freedom of Information New Animal Drug Applications summaries. The eligible population was weaned beef cattle raised in intensive systems. The interventions of interest were injectable antibiotics used at the time the cattle arrived at the feedlot. The outcome of interest was the diagnosis of BRD within 45 days of arrival at the feedlot. The network meta-analysis included data from 46 studies and 167 study arms identified in the review. The results suggest that macrolides are the most effective antibiotics for the reduction of BRD incidence. Injectable oxytetracycline effectively controlled BRD compared with no antibiotics; however, it was less effective than macrolide treatment. Because oxytetracycline is already commonly used to prevent, control, and treat BRD in groups of feedlot cattle, the use of injectable oxytetracycline for BRD control might have advantages from an antibiotic stewardship perspective.
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25
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Conrad CC, Daher RK, Stanford K, Amoako KK, Boissinot M, Bergeron MG, Alexander T, Cook S, Ralston B, Zaheer R, Niu YD, McAllister T. A Sensitive and Accurate Recombinase Polymerase Amplification Assay for Detection of the Primary Bacterial Pathogens Causing Bovine Respiratory Disease. Front Vet Sci 2020; 7:208. [PMID: 32426381 PMCID: PMC7212441 DOI: 10.3389/fvets.2020.00208] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 03/30/2020] [Indexed: 12/25/2022] Open
Abstract
Rapid and accurate diagnosis of bovine respiratory disease (BRD) presents a substantial challenge to the North American cattle industry. Here we utilize recombinase polymerase amplification (RPA), a fast and sensitive isothermal DNA-based technology for the detection of four BRD pathogens (Mannheimia haemolytica, Pasteurella multocida, Histophilus somni, Mycoplasma bovis), genes coding antimicrobial resistance (AMR) and integrative conjugative elements (ICE) which can harbor AMR genes. Eleven RPA assays were designed and validated including: a) one conventional species-specific multiplex assay targeting the 4 BRD pathogens, b) two species-specific real-time multiplex RPA assays targeting M. haemolytica/M. bovis and P. multocida/H. somni, respectively with a novel competitive internal amplification control, c) seven conventional assays targeting AMR genes (tetH, tetR, msrE, mphE, sul2, floR, erm42), and d) one real-time assay targeting ICE. Each real-time RPA assay was tested on 100 deep nasopharyngeal swabs (DNPS) collected from feedlot cattle previously assessed for targets using either culture methods and/or polymerase chain reaction (PCR) verification (TC-PCR). The developed RPA assays enabled sensitive and accurate identification of BRD agents and AMR/ICE genes directly from DNPS, in a shorter period than TC-PCR, showing considerable promise as a tool for point-of-care identification of BRD pathogens and antimicrobial resistance genes.
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Affiliation(s)
- Cheyenne C Conrad
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, AB, Canada
| | - Rana K Daher
- Centre de Recherche en Infectiologie de l'Université Laval, Québec City, QC, Canada
| | - Kim Stanford
- Alberta Agriculture and Forestry, Lethbridge, AB, Canada
| | - Kingsley K Amoako
- National Centre for Animal Disease, Canadian Food Inspection Agency, Lethbridge, AB, Canada
| | - Maurice Boissinot
- Centre de Recherche en Infectiologie de l'Université Laval, Québec City, QC, Canada
| | - Michel G Bergeron
- Centre de Recherche en Infectiologie de l'Université Laval, Québec City, QC, Canada
| | - Trevor Alexander
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, AB, Canada
| | - Shaun Cook
- Alberta Agriculture and Forestry, Lethbridge, AB, Canada
| | | | - Rahat Zaheer
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, AB, Canada
| | - Yan D Niu
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Tim McAllister
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, AB, Canada
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26
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Watts JL, Sweeney MT, Lubbers BV. Current and future perspectives on the categorization of antimicrobials used in veterinary medicine. J Vet Pharmacol Ther 2020; 44:207-214. [PMID: 32112438 DOI: 10.1111/jvp.12846] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 01/10/2020] [Accepted: 01/15/2020] [Indexed: 11/29/2022]
Abstract
The emergence of antimicrobial resistance in human and veterinary bacterial pathogens has led to concerns regarding the use of antimicrobials in veterinary medicine. Consequently, regulatory agencies have developed procedures for assessing the risk associated with the use of a specific antimicrobial as part of the drug approval process. Due consideration for the importance (priority categorization) of the antimicrobial to human medicine is part of this risk assessment process. Additionally, nongovernmental organizations have developed antimicrobial categorization schemes to protect the use and effectiveness of these medicines. However, the goals and methods of the various categorization schemes vary, resulting in final categorizations that are different. Although harmonizing these schemes would bring clarity to antimicrobial resistance discussions and policy, it has the disadvantage of not accounting for regional antimicrobial resistance and use, potentially removing effective medicines from clinical use in situations where they are wholly appropriate. Antimicrobials should be classified in a One Health manner, where both physician and veterinarian share the responsibility for antimicrobial use. The purpose of this article is to summarize current antimicrobial categorization schemes using illustrative examples to highlight differences and provide perspectives on the impact of the current schemes and future directions.
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Affiliation(s)
- Jeffrey L Watts
- Veterinary Medicine Research and Development, Zoetis, Inc., Kalamazoo, MI, USA
| | - Michael T Sweeney
- Veterinary Medicine Research and Development, Zoetis, Inc., Kalamazoo, MI, USA
| | - Brian V Lubbers
- College of Veterinary Medicine, Kansas State University, Manhattan, KS, USA
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27
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Antimicrobial Resistance in Members of the Bacterial Bovine Respiratory Disease Complex Isolated from Lung Tissue of Cattle Mortalities Managed with or without the Use of Antimicrobials. Microorganisms 2020; 8:microorganisms8020288. [PMID: 32093326 PMCID: PMC7074851 DOI: 10.3390/microorganisms8020288] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 02/11/2020] [Accepted: 02/17/2020] [Indexed: 02/06/2023] Open
Abstract
Over a two-year period, Mannheimia haemolytica (MH; n = 113), Pasteurella multocida (PM; n = 47), Histophilus somni (HS; n = 41) and Mycoplasma bovis (MB; n = 227) were isolated from bovine lung tissue at necropsy from cattle raised conventionally (CON, n = 29 feedlots) or without antimicrobials [natural (NAT), n = 2 feedlots]. Excluding MB, isolates were assayed by PCR to detect the presence of 13 antimicrobial resistance (AMR) genes and five core genes associated with integrative and conjugative elements (ICEs). Antimicrobial susceptibility phenotypes and minimum inhibitory concentrations (MICs, µg/mL) were determined for a subset of isolates (MH, n = 104; PM, n = 45; HS, n = 23; and MB, n = 61) using Sensititre analyses. A subset of isolates (n = 21) was also evaluated by whole-genome sequencing (WGS) based on variation in AMR phenotype. All five ICE core genes were detected in PM and HS by PCR, but only 3/5 were present in MH. Presence of mco and tnpA ICE core genes in MH was associated with higher MICs (p < 0.05) for all tetracyclines, and 2/3 of all macrolides, aminoglycosides and fluoroquinolones evaluated. In contrast, association of ICE core genes with MICs was largely restricted to macrolides for PM and to individual tetracyclines and macrolides for HS. For MH, the average number of AMR genes markedly increased (p < 0.05) in year 2 of the study due to the emergence of a strain that was PCR positive for all 13 PCR-tested AMR genes as well as two additional AMR genes (aadA31 and blaROB-1) detected by WGS. Conventional management of cattle increased (p < 0.05) MICs of tilmicosin and tulathromycin for MH; neomycin and spectinomycin for PM; and gamithromycin and tulathromycin for MB. The average number of PCR-detected AMR genes in PM was also increased (p < 0.05) in CON mortalities. This study demonstrates increased AMR especially to macrolides by bovine respiratory disease organisms in CON as compared to NAT feedlots and a rapid increase in AMR following dissemination of strain(s) carrying ICE-associated multidrug resistance.
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28
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Coetzee JF, Magstadt DR, Sidhu PK, Follett L, Schuler AM, Krull AC, Cooper VL, Engelken TJ, Kleinhenz MD, O'Connor AM. Association between antimicrobial drug class for treatment and retreatment of bovine respiratory disease (BRD) and frequency of resistant BRD pathogen isolation from veterinary diagnostic laboratory samples. PLoS One 2019; 14:e0219104. [PMID: 31835273 PMCID: PMC6910856 DOI: 10.1371/journal.pone.0219104] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 11/19/2019] [Indexed: 02/07/2023] Open
Abstract
Although 90% of BRD relapses are reported to receive retreatment with a different class of antimicrobial, studies examining the impact of antimicrobial selection (i.e. bactericidal or bacteriostatic) on retreatment outcomes and the emergence of antimicrobial resistance (AMR) are deficient in the published literature. This survey was conducted to determine the association between antimicrobial class selection for treatment and retreatment of BRD relapses on antimicrobial susceptibility of Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni. Pathogens were isolated from samples submitted to the Iowa State University Veterinary Diagnostic Laboratory from January 2013 to December 2015. A total of 781 isolates with corresponding animal case histories, including treatment protocols, were included in the analysis. Original susceptibility testing of these isolates for ceftiofur, danofloxacin, enrofloxacin, florfenicol, oxytetracycline, spectinomycin, tilmicosin, and tulathromycin was performed using Clinical and Laboratory Standards Institute guidelines. Data were analyzed using a Bayesian approach to evaluate whether retreatment with antimicrobials of different mechanistic classes (bactericidal or bacteriostatic) increased the probability of resistant BRD pathogen isolation in calves. The posterior distribution we calculated suggests that an increased number of treatments is associated with a greater probability of isolates resistant to at least one antimicrobial. Furthermore, the frequency of resistant BRD bacterial isolates was greater with retreatment using antimicrobials of different mechanistic classes than retreatment with the same class. Specifically, treatment protocols using a bacteriostatic drug first followed by retreatment with a bactericidal drug were associated with a higher frequency of resistant BRD pathogen isolation. In particular, first treatment with tulathromycin (bacteriostatic) followed by ceftiofur (bactericidal) was associated with the highest probability of resistant M. haemolytica among all antimicrobial combinations. These observations suggest that consideration should be given to antimicrobial pharmacodynamics when selecting drugs for retreatment of BRD. However, prospective studies are needed to determine the clinical relevance to antimicrobial stewardship programs in livestock production systems.
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Affiliation(s)
- Johann F Coetzee
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, United States of America.,Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States of America
| | - Drew R Magstadt
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, United States of America
| | - Pritam K Sidhu
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States of America
| | - Lendie Follett
- Department of Information Management and Business Analytics, College of Business and Public Administration, Drake University, Des Moines, IA, United States of America
| | - Adlai M Schuler
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, United States of America
| | - Adam C Krull
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, United States of America
| | - Vickie L Cooper
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, United States of America
| | - Terry J Engelken
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, United States of America
| | - Michael D Kleinhenz
- Department of Clinical Sciences, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States of America
| | - Annette M O'Connor
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, United States of America
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Kurt T, Wong N, Fowler H, Gay C, Lillehoj H, Plummer P, Scott HM, Hoelzer K. Strategic Priorities for Research on Antibiotic Alternatives in Animal Agriculture-Results From an Expert Workshop. Front Vet Sci 2019; 6:429. [PMID: 31850384 PMCID: PMC6896835 DOI: 10.3389/fvets.2019.00429] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 11/14/2019] [Indexed: 12/16/2022] Open
Abstract
The emergence, spread, and expansion of antibiotic resistance and increasing restrictions on the use of antibiotics in animal agriculture have created a need for efficacious alternatives that remains unmet. Prioritizing research needs in the development of alternatives is key to ensuring that scarce research resources are dedicated to the most promising approaches. However, frameworks to enable a consistent, systematic, and transparent evaluation of antibiotic alternative candidates are lacking. Here, we present such an evaluation framework.
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Affiliation(s)
- Timothy Kurt
- Foundation for Food and Agriculture Research, Washington, DC, United States
| | - Nora Wong
- Pew Charitable Trusts, Washington, DC, United States
| | | | - Cyril Gay
- Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD, United States
| | - Hyun Lillehoj
- Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD, United States
| | - Paul Plummer
- College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| | - H. Morgan Scott
- Department of Veterinary Pathobiology, Texas A&M University, College Station, TX, United States
| | - Karin Hoelzer
- Pew Charitable Trusts, Washington, DC, United States
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30
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Schönecker L, Schnyder P, Overesch G, Schüpbach-Regula G, Meylan M. Associations between antimicrobial treatment modalities and antimicrobial susceptibility in Pasteurellaceae and E. coli isolated from veal calves under field conditions. Vet Microbiol 2019; 236:108363. [PMID: 31500731 DOI: 10.1016/j.vetmic.2019.07.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/04/2019] [Accepted: 07/19/2019] [Indexed: 02/02/2023]
Abstract
Antimicrobial consumption, with bovine respiratory disease as main indication, is higher in the veal calf industry compared to other livestock production branches. The aim of the present study was to investigate possible associations between antimicrobial drug use and resistance in Pasteurellaceae and indicator Escherichia (E.) coli from veal calves under field conditions in a prospective trial. Over a period of one year, nasopharyngeal and rectal swabs were collected from 2587 animals on 12 and 43 farms, respectively. Antimicrobial susceptibility testing was performed on 346 Mannheimia (M.) haemolytica, 1162 Pasteurella (P.) multocida and 2138 E. coli. Drug use was quantified as treatment incidence for each farm based on the used daily dose methodology (TIUDD), separately for group and individual treatments, and for antimicrobial classes. In multivariable mixed logistic regression analyses, risk factors could be identified for reduced susceptibility to certain antimicrobial classes. Group treatment was generally associated with higher rates of not susceptible (NS) M. haemolytica and P. multocida and non-wildtype (non-WT) E. coli. Individual treatment was associated with less NS and non-WT isolates. Age and entry protocol were important confounders with younger animals showing higher rates of NS and non-WT strains. The present findings suggest that, under field conditions, targeted individual treatment of calves can reduce the development of antimicrobial resistance compared to oral group treatment. For the different microorganisms, risk factors for resistance were partially different. This demonstrates that indicator organisms like E. coli do not necessarily reflect the associations observed in respiratory pathogens.
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Affiliation(s)
- L Schönecker
- Clinic for Ruminants, Vetsuisse Faculty, University of Bern, Switzerland; Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Switzerland
| | - P Schnyder
- Clinic for Ruminants, Vetsuisse Faculty, University of Bern, Switzerland
| | - G Overesch
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Switzerland
| | - G Schüpbach-Regula
- Veterinary Public Health Institute, Vetsuisse Faculty, University of Bern, Switzerland
| | - M Meylan
- Clinic for Ruminants, Vetsuisse Faculty, University of Bern, Switzerland.
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31
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Snyder ER, Alvarez-Narvaez S, Credille BC. Genetic characterization of susceptible and multi-drug resistant Mannheimia haemolytica isolated from high-risk stocker calves prior to and after antimicrobial metaphylaxis. Vet Microbiol 2019; 235:110-117. [PMID: 31282368 DOI: 10.1016/j.vetmic.2019.06.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 06/11/2019] [Accepted: 06/13/2019] [Indexed: 12/24/2022]
Abstract
Bovine Respiratory Disease (BRD) is a major threat to animal health and welfare in the cattle industry. Strains of Mannheimia haemolytica (Mh) that are resistant to multiple classes of antimicrobials are becoming a major concern in the beef industry, as the frequency of isolation of these strains has been increasing. Mobile genetic elements, such as integrative conjugative elements (ICE), are frequently implicated in this rapid increase in multi-drug resistance. The objectives of the current study were to determine the genetic relationship between the isolates collected at arrival before metaphylaxis and at revaccination after metaphylaxis, to identify which resistance genes might be present in these isolates, and to determine if they were carried on an ICE. Twenty calves culture positive for Mh at arrival and revaccination were identified, and a total of 48 isolates with unique susceptibility profiles (26 from arrival, and 22 from revaccination) were submitted for whole-genome sequencing (WGS). A phylogenetic tree was constructed, showing the arrival isolates falling into four clades, and all revaccination isolates within one clade. All revaccination isolates, and one arrival isolate, were positive for the presence of an ICE. Three different ICEs with resistance gene modules were identified. The resistance genes aphA1, strA, strB, sul2, floR, erm42, tetH/R, aadB, aadA25, blaOXA-2, msrE, mphE were all located within an ICE. The gene bla-ROB1 was also present in the isolates, but was not located within an ICE.
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Affiliation(s)
- Emily R Snyder
- Food Animal Health and Management Program, Department of Population Health, College of Veterinary Medicine, University of Georgia, 2200 College Station Road, Athens, GA, 30602, United States.
| | - Sonsiray Alvarez-Narvaez
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, 2200 College Station Road, Athens, GA, 30602, United States
| | - Brent C Credille
- Food Animal Health and Management Program, Department of Population Health, College of Veterinary Medicine, University of Georgia, 2200 College Station Road, Athens, GA, 30602, United States
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32
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Pathogenesis, Host Innate Immune Response, and Aerosol Transmission of Influenza D Virus in Cattle. J Virol 2019; 93:JVI.01853-18. [PMID: 30674628 DOI: 10.1128/jvi.01853-18] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 01/03/2019] [Indexed: 11/20/2022] Open
Abstract
The recently discovered influenza D virus (IDV) of the Orthomyxoviridae family has been detected in swine and ruminants with a worldwide distribution. Cattle are considered to be the primary host and reservoir, and previous studies suggested a tropism of IDV for the upper respiratory tract and a putative role in the bovine respiratory disease complex. This study aimed to characterize the pathogenicity of IDV in naive calves as well as the ability of this virus to transmit by air. Eight naive calves were infected by aerosol with a recent French isolate, D/bovine/France/5920/2014. Results show that IDV replicates not only in the upper respiratory tract but also in the lower respiratory tract (LRT), inducing moderate bronchopneumonia with restricted lesions of interstitial pneumonia. Inoculation was followed by IDV-specific IgG1 production as early as 10 days postchallenge and likely both Th1 and Th2 responses. Study of the innate immune response in the LRT of IDV-infected calves indicated the overexpression of pathogen recognition receptors and of chemokines CCL2, CCL3, and CCL4, but without overexpression of genes involved in the type I interferon pathway. Finally, virological examination of three aerosol-sentinel animals, housed 3 m apart from inoculated calves (and thus subject to infection by aerosol transmission), and IDV detection in air samples collected in different areas showed that IDV can be airborne transmitted and infect naive contact calves on short distances. This study suggests that IDV is a respiratory virus with moderate pathogenicity and probably a high level of transmission. It consequently can be considered predisposing to or a cofactor of respiratory disease.IMPORTANCE Influenza D virus (IDV), a new genus of the Orthomyxoviridae family, has a broad geographical distribution and can infect several animal species. Cattle are so far considered the primary host for IDV, but the pathogenicity and the prevalence of this virus are still unclear. We demonstrated that under experimental conditions (in a controlled environment and in the absence of coinfecting pathogens), IDV is able to cause mild to moderate disease and targets both the upper and lower respiratory tracts. The virus can transmit by direct as well as aerosol contacts. While this study evidenced overexpression of pathogen recognition receptors and chemokines in the lower respiratory tract, IDV-specific IgG1 production as early as 10 days postchallenge, and likely both Th1 and Th2 responses, further studies are warranted to better understand the immune responses triggered by IDV and its role as part of the bovine respiratory disease complex.
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33
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Sellera FP, Madec JY, Lincopan N. Comment on: Applying definitions for multidrug resistance, extensive drug resistance and pandrug resistance to clinically significant livestock and companion animal bacterial pathogens. J Antimicrob Chemother 2019; 74:535-536. [PMID: 30189004 DOI: 10.1093/jac/dky351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Affiliation(s)
- Fábio P Sellera
- Department of Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Jean-Yves Madec
- Unité Antibiorésistance et Virulence Bactériennes, Université de Lyon - Agence Nationale de Sécurité Sanitaire (ANSES), Lyon, France
| | - Nilton Lincopan
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
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Abstract
Optimization of antimicrobial treatment is a cornerstone in the fight against antimicrobial resistance. Various national and international authorities and professional veterinary and farming associations have released generic guidelines on prudent antimicrobial use in animals. However, these generic guidelines need to be translated into a set of animal species- and disease-specific practice recommendations. This article focuses on prevention of antimicrobial resistance and its complex relationship with treatment efficacy, highlighting key situations where the current antimicrobial drug products, treatment recommendations, and practices may be insufficient to minimize antimicrobial selection. The authors address this topic using a multidisciplinary approach involving microbiology, pharmacology, clinical medicine, and animal husbandry. In the first part of the article, we define four key targets for implementing the concept of optimal antimicrobial treatment in veterinary practice: (i) reduction of overall antimicrobial consumption, (ii) improved use of diagnostic testing, (iii) prudent use of second-line, critically important antimicrobials, and (iv) optimization of dosage regimens. In the second part, we provided practice recommendations for achieving these four targets, with reference to specific conditions that account for most antimicrobial use in pigs (intestinal and respiratory disease), cattle (respiratory disease and mastitis), dogs and cats (skin, intestinal, genitourinary, and respiratory disease), and horses (upper respiratory disease, neonatal foal care, and surgical infections). Lastly, we present perspectives on the education and research needs for improving antimicrobial use in the future.
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Abstract
Members of the highly heterogeneous family Pasteurellaceae cause a wide variety of diseases in humans and animals. Antimicrobial agents are the most powerful tools to control such infections. However, the acquisition of resistance genes, as well as the development of resistance-mediating mutations, significantly reduces the efficacy of the antimicrobial agents. This article gives a brief description of the role of selected members of the family Pasteurellaceae in animal infections and of the most recent data on the susceptibility status of such members. Moreover, a review of the current knowledge of the genetic basis of resistance to antimicrobial agents is included, with particular reference to resistance to tetracyclines, β-lactam antibiotics, aminoglycosides/aminocyclitols, folate pathway inhibitors, macrolides, lincosamides, phenicols, and quinolones. This article focusses on the genera of veterinary importance for which sufficient data on antimicrobial susceptibility and the detection of resistance genes are currently available (Pasteurella, Mannheimia, Actinobacillus, Haemophilus, and Histophilus). Additionally, the role of plasmids, transposons, and integrative and conjugative elements in the spread of the resistance genes within and beyond the aforementioned genera is highlighted to provide insight into horizontal dissemination, coselection, and persistence of antimicrobial resistance genes. The article discusses the acquisition of diverse resistance genes by the selected Pasteurellaceae members from other Gram-negative or maybe even Gram-positive bacteria. Although the susceptibility status of these members still looks rather favorable, monitoring of their antimicrobial susceptibility is required for early detection of changes in the susceptibility status and the newly acquired/developed resistance mechanisms.
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Closed Genome Sequences and Antibiograms of 16 Pasteurella multocida Isolates from Bovine Respiratory Disease Complex Cases and Apparently Healthy Controls. Microbiol Resour Announc 2018; 7:MRA00976-18. [PMID: 30533636 PMCID: PMC6256659 DOI: 10.1128/mra.00976-18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 08/22/2018] [Indexed: 11/20/2022] Open
Abstract
Pasteurella multocida is an animal-associated Gram-negative member of the Pasteurellaceae family. It is an opportunistic pathogen and is one of the principal bacterial species contributing to bovine respiratory disease complex (BRDC) in feedlot cattle. Pasteurella multocida is an animal-associated Gram-negative member of the Pasteurellaceae family. It is an opportunistic pathogen and is one of the principal bacterial species contributing to bovine respiratory disease complex (BRDC) in feedlot cattle. We present 16 closed genome sequences and antibiograms of isolates cultured from calves exhibiting clinical signs of BRDC and from control calves not showing signs of BRDC.
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A Novel aadA Aminoglycoside Resistance Gene in Bovine and Porcine Pathogens. mSphere 2018; 3:mSphere00568-17. [PMID: 29507894 PMCID: PMC5830473 DOI: 10.1128/msphere.00568-17] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 01/23/2018] [Indexed: 11/30/2022] Open
Abstract
Aminoglycosides are important antimicrobials used worldwide for prophylaxis and/or therapy in multiple production animal species. The emergence of new resistance genes jeopardizes current pathogen detection and treatment methods. The risk of resistance gene transfer to other animal and human pathogens is elevated when resistance genes are carried by mobile genetic elements. This study identified a new variant of a spectinomycin/streptomycin resistance gene harbored in a self-transmissible mobile element. The gene was also present in four different bovine pathogen species. A novel variant of the AAD(3″) class of aminoglycoside-modifying enzymes was discovered in fatal bovine respiratory disease-associated pathogens Pasteurella multocida and Histophilus somni. The aadA31 gene encodes a spectinomycin/streptomycin adenylyltransferase and was located in a variant of the integrative and conjugative element ICEMh1, a mobile genetic element transmissible among members of the family Pasteurellaceae. The gene was also detected in Mannheimia haemolytica from a case of porcine pneumonia and in Moraxella bovoculi from a case of keratoconjunctivitis. IMPORTANCE Aminoglycosides are important antimicrobials used worldwide for prophylaxis and/or therapy in multiple production animal species. The emergence of new resistance genes jeopardizes current pathogen detection and treatment methods. The risk of resistance gene transfer to other animal and human pathogens is elevated when resistance genes are carried by mobile genetic elements. This study identified a new variant of a spectinomycin/streptomycin resistance gene harbored in a self-transmissible mobile element. The gene was also present in four different bovine pathogen species.
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Totton SC, Cullen JN, Sargeant JM, O'Connor AM. The reporting characteristics of bovine respiratory disease clinical intervention trials published prior to and following publication of the REFLECT statement. Prev Vet Med 2017; 150:117-125. [PMID: 29406078 DOI: 10.1016/j.prevetmed.2017.12.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 12/09/2017] [Accepted: 12/23/2017] [Indexed: 11/19/2022]
Abstract
The goal of the REFLECT Statement (Reporting guidElines For randomized controLled trials in livEstoCk and food safeTy) (published in 2010) was to provide the veterinary research community with reporting guidelines tailored for randomized controlled trials for livestock and food safety. Our objective was to determine the prevalence of REFLECT Statement reporting of items 1-19 in controlled trials published in journals between 1970 and 2017 examining the comparative efficacy of FDA-registered antimicrobials against naturally acquired BRD (bovine respiratory disease) in weaned beef calves in Canada or the USA, and to compare the prevalence of reporting before and after 2010, when REFLECT was published. We divided REFLECT Statement, items 3, 5, 10, and 11 into subitems, because each dealt with multiple elements requiring separate assessment. As a result, 28 different items or subitems were evaluated independently. We searched MEDLINE® and CABI (CAB Abstracts® and Global Health®) (Web of Science™) in April 2017 and screened 2327 references. Two reviewers independently assessed the reporting of each item and subitem. Ninety-five references were eligible for the study. The reporting of the REFLECT items showed a point estimate for the prevalence ratio >1 (i.e. a higher proportion of studies published post-2010 reported this item compared to studies published pre-2010), apart from items 10.3, i.e., item 10, subitem 3 (who assigned study units to the interventions), 13 (the flow of study units through the study), 16 (number of study units in analysis), 18 (multiplicity), and 19 (adverse effects). Fifty-three (79%) of 67 studies published before 2010 and all 28 (100%) papers published after 2010 reported using a random allocation method in either the title, abstract, or methods (Prevalence ratio = 1.25; 95% CI (1.09,1.43)). However, 8 studies published prior to 2010 and 7 studies published post-2010 reported the term "systematic randomization" or variations of this term (which is not true randomization) to describe the allocation procedure. Fifty-five percent (37/67) of studies published pre-2010 reported blinding status (blinded/not blinded) of outcome assessors, compared to 24/28 (86%) of studies published post-2010 (Prevalence ratio = 1.5, 95% CI (1.19, 2.02)). The reporting of recommended items in journal articles in this body of work is generally improving; however, there is also evidence of confusion about what constitutes a random allocation procedure, and this suggests an educational need. As this study is observational, this precludes concluding that the publication of the REFLECT Statement was the cause of this trend.
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Affiliation(s)
- Sarah C Totton
- 63 College Avenue West, Guelph, Ontario, N1G 1S1, Canada.
| | - Jonah N Cullen
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, 50011-3619, USA
| | - Jan M Sargeant
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, Ontario, N1G 2W1, Canada; Centre for Public Health and Zoonoses, University of Guelph, 50 Stone Road East, Guelph, Ontario, N1G 2W1, Canada; Arrell Food Institute, University of Guelph ,50 Stone Road East, Guelph, Ontario, N1G 2W1, Canada
| | - Annette M O'Connor
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, 50011-3619, USA
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Magstadt DR, Schuler AM, Coetzee JF, Krull AC, O'Connor AM, Cooper VL, Engelken TJ. Treatment history and antimicrobial susceptibility results for Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni isolates from bovine respiratory disease cases submitted to the Iowa State University Veterinary Diagnostic Laboratory from 2013 to 2015. J Vet Diagn Invest 2017; 30:99-104. [PMID: 29034785 DOI: 10.1177/1040638717737589] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Bovine respiratory disease is the most costly disease facing the cattle industry. Increasing resistance to antimicrobial treatment has been presented as a significant contributing factor, often through summarized susceptibility testing data. We assessed the relationship between previous antimicrobial treatment and antimicrobial susceptibility results from isolates of Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni cultured from bovine respiratory cases submitted to the Iowa State University Veterinary Diagnostic Laboratory from 2013 to 2015. Antimicrobial susceptibility data from 1,251 bacterial isolates were included for analysis. More bacterial isolates from cattle that received antimicrobial treatment showed resistance compared to isolates from untreated cattle, and the percentage of resistant isolates increased as the number of antimicrobial treatments increased. Resistance to enrofloxacin, spectinomycin, tilmicosin, and tulathromycin was present in >75% of M. haemolytica isolates from cattle that had received 3 or more antimicrobial treatments; resistance to each of those 4 antimicrobials was present in ≤10% of M. haemolytica isolates from untreated cattle. Similar but less dramatic trends were apparent for isolates of P. multocida and H. somni. The percentage of multi-drug resistant bacterial isolates also increased with the number of treatments. Results of our study suggest that previous antimicrobial treatment may have a profound effect on antimicrobial susceptibility testing. Summarized susceptibility results from diagnostic laboratories should not be used to make generalized statements regarding trends in antimicrobial resistance without providing context regarding antimicrobial treatment history.
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Affiliation(s)
- Drew R Magstadt
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
| | - Adlai M Schuler
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
| | - Johann F Coetzee
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
| | - Adam C Krull
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
| | - Annette M O'Connor
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
| | - Vickie L Cooper
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
| | - Terry J Engelken
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA
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Closed Genome Sequences of Seven Histophilus somni Isolates from Beef Calves with Bovine Respiratory Disease Complex. GENOME ANNOUNCEMENTS 2017; 5:5/40/e01099-17. [PMID: 28983006 PMCID: PMC5629063 DOI: 10.1128/genomea.01099-17] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Histophilus somni is a fastidious Gram-negative opportunistic pathogenic Pasteurellaceae that affects multiple organ systems and is one of the principal bacterial species contributing to bovine respiratory disease complex (BRDC) in feed yard cattle. Here, we present seven closed genome sequences isolated from three beef calves showing sign of BRDC.
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Whole-Genome Sequencing and Concordance Between Antimicrobial Susceptibility Genotypes and Phenotypes of Bacterial Isolates Associated with Bovine Respiratory Disease. G3-GENES GENOMES GENETICS 2017; 7:3059-3071. [PMID: 28739600 PMCID: PMC5592931 DOI: 10.1534/g3.117.1137] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Extended laboratory culture and antimicrobial susceptibility testing timelines hinder rapid species identification and susceptibility profiling of bacterial pathogens associated with bovine respiratory disease, the most prevalent cause of cattle mortality in the United States. Whole-genome sequencing offers a culture-independent alternative to current bacterial identification methods, but requires a library of bacterial reference genomes for comparison. To contribute new bacterial genome assemblies and evaluate genetic diversity and variation in antimicrobial resistance genotypes, whole-genome sequencing was performed on bovine respiratory disease–associated bacterial isolates (Histophilus somni, Mycoplasma bovis, Mannheimia haemolytica, and Pasteurella multocida) from dairy and beef cattle. One hundred genomically distinct assemblies were added to the NCBI database, doubling the available genomic sequences for these four species. Computer-based methods identified 11 predicted antimicrobial resistance genes in three species, with none being detected in M. bovis. While computer-based analysis can identify antibiotic resistance genes within whole-genome sequences (genotype), it may not predict the actual antimicrobial resistance observed in a living organism (phenotype). Antimicrobial susceptibility testing on 64 H. somni, M. haemolytica, and P. multocida isolates had an overall concordance rate between genotype and phenotypic resistance to the associated class of antimicrobials of 72.7% (P < 0.001), showing substantial discordance. Concordance rates varied greatly among different antimicrobial, antibiotic resistance gene, and bacterial species combinations. This suggests that antimicrobial susceptibility phenotypes are needed to complement genomically predicted antibiotic resistance gene genotypes to better understand how the presence of antibiotic resistance genes within a given bacterial species could potentially impact optimal bovine respiratory disease treatment and morbidity/mortality outcomes.
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Prevalence and antimicrobial susceptibility of Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni isolated from the lower respiratory tract of healthy feedlot cattle and those diagnosed with bovine respiratory disease. Vet Microbiol 2017; 208:118-125. [PMID: 28888626 DOI: 10.1016/j.vetmic.2017.07.013] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 07/11/2017] [Accepted: 07/12/2017] [Indexed: 11/23/2022]
Abstract
Current information on prevalence and antimicrobial resistance (AMR) of bacterial respiratory pathogens is crucial to guide antimicrobial choice for control and treatment of bovine respiratory disease (BRD). The objectives were to describe the prevalence of three BRD-associated bacteria (Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni) in the lower airways of feedlot cattle, and to analyze AMR in these bacteria. Cattle with (n=210) and without (n=107) BRD were sampled by trans-tracheal aspiration at four feedlots (Nov. 15-Jan. 16). These cattle had received 2.5mg/kg of tulathromycin on arrival at the feedlot for BRD control and two in-feed pulses of chlortetracycline (5g/animal/day for 5days) within the first 21days on feed to prevent histophilosis. Bacteria were detected by culture and AMR was tested by microdilution. Pasteurella multocida was the most frequent bacterium isolated in cattle with BRD (54.8%), followed by M. haemolytica (30.5%) and H. somni (22.9%). Compared to those with BRD, healthy cattle were less likely to be positive for P. multocida (OR=0.27), M. haemolytica (OR=0.32), or H. somni (OR=0.25). There were high levels of resistance (>70%) against tulathromycin and oxytetracycline in M. haemolytica and P. multocida isolates and high levels of resistance against oxytetracycline (67%) and penicillin (52%) in H. somni isolates. None or few isolates were resistant to florfenicol, enrofloxacin and ceftiofur. The high prevalence of resistance against tulathromycin and oxytetracycline suggests that these antimicrobials should not be repeatedly used for both control and treatment of BRD and/or histophilosis.
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Snyder E, Credille B, Berghaus R, Giguère S. Prevalence of multi drug antimicrobial resistance in Mannheimia haemolytica isolated from high-risk stocker cattle at arrival and two weeks after processing1. J Anim Sci 2017; 95:1124-1131. [DOI: 10.2527/jas.2016.1110] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Magalhães LQ, Baptista AL, Fonseca PDA, Menezes GL, Nogueira GM, Headley SA, Fritzen JTT, Alfieri AA, Saut JPE. Use of metaphylactic protocols based on the risk to develop bovine respiratory diseases in feedlot cattle. CIÊNCIA RURAL 2017; 47. [DOI: 10.1590/0103-8478cr20161110] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
ABSTRACT: Bovine respiratory diseases (BRD) affect production rates negatively because it compromise health and well-being of the affected animal. The hypothesis of this study was that the use of metaphylactic protocols based on the risk to develop BRD would reduce morbidity and pulmonary lesions. For this purpose, the aims of this study were to evaluate the effect of two metaphylactic protocols on the morbidity of feedlot cattle with a known sanitary history, occurrence of pulmonary lesions at slaughter, and the possible participation of Mannheimia haemolytica, Histophilus somni, Bovine alphaherpesvirus 1 (BoHV-1) and bovine respiratory syncytial virus (BRSV) in the development of BRD. An experimental study was designed in which 3,094 adult, male, cattle, were grouped according to the risk to develop BRD: a) group without metaphylaxis (n=2,104), low-risk animals; b) metaphylaxis group with oxytetracycline (n=789), moderate-risk animals; c) metaphylaxis group with tildipirosin (n=201), high-risk animals. All cattle were immunized against pathogens associated with BRD (BoHV-1, BVDV, BRSV, PI3). The morbidity for BRD was 8.2% (253/3,094); cattle within the moderate-risk group for BRD had the lowest frequency (6.1%), followed by high-risk animals with tildipirosin metaphylaxis (6.5%) and low-risk without metaphylaxis (9.1%) (P=0.019). At the abattoir, 1.2% of lungs with lesions were found. There was a difference (P=0.036) in the frequency of pulmonary lesions between healthy animals (1.1%) and those diagnosed with BRD (2.8%). Two agents associated with BRD were identified by PCR assays in the lungs (n=37) of cattle: M. haemolytica (16.2%) and H. somni (5.4%). In addition, concomitant infections involving these pathogens were identified in the lungs of two steers. These results demonstrate that the use of metaphylactic protocols, based on the risk to develop BRD, reduces morbidity and pulmonary lesions in affected cattle. Furthermore, pulmonary lesions were more frequent in animals with a history of BRD.
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Affiliation(s)
| | | | | | | | | | - Selwyn Arlington Headley
- Universidade Estadual de Londrina (UEL), Brazil; Universidade Estadual de Londrina (UEL), Brazil
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Cameron A, McAllister TA. Antimicrobial usage and resistance in beef production. J Anim Sci Biotechnol 2016; 7:68. [PMID: 27999667 PMCID: PMC5154118 DOI: 10.1186/s40104-016-0127-3] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 10/28/2016] [Indexed: 11/10/2022] Open
Abstract
Antimicrobials are critical to contemporary high-intensity beef production. Many different antimicrobials are approved for beef cattle, and are used judiciously for animal welfare, and controversially, to promote growth and feed efficiency. Antimicrobial administration provides a powerful selective pressure that acts on the microbial community, selecting for resistance gene determinants and antimicrobial-resistant bacteria resident in the bovine flora. The bovine microbiota includes many harmless bacteria, but also opportunistic pathogens that may acquire and propagate resistance genes within the microbial community via horizontal gene transfer. Antimicrobial-resistant bovine pathogens can also complicate the prevention and treatment of infectious diseases in beef feedlots, threatening the efficiency of the beef production system. Likewise, the transmission of antimicrobial resistance genes to bovine-associated human pathogens is a potential public health concern. This review outlines current antimicrobial use practices pertaining to beef production, and explores the frequency of antimicrobial resistance in major bovine pathogens. The effect of antimicrobials on the composition of the bovine microbiota is examined, as are the effects on the beef production resistome. Antimicrobial resistance is further explored within the context of the wider beef production continuum, with emphasis on antimicrobial resistance genes in the food chain, and risk to the human population.
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Affiliation(s)
- Andrew Cameron
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB Canada ; Agriculture and Agri-Food Canada, Lethbridge, AB Canada
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47
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Clawson ML, Murray RW, Sweeney MT, Apley MD, DeDonder KD, Capik SF, Larson RL, Lubbers BV, White BJ, Kalbfleisch TS, Schuller G, Dickey AM, Harhay GP, Heaton MP, Chitko-McKown CG, Brichta-Harhay DM, Bono JL, Smith TPL. Genomic signatures of Mannheimia haemolytica that associate with the lungs of cattle with respiratory disease, an integrative conjugative element, and antibiotic resistance genes. BMC Genomics 2016; 17:982. [PMID: 27894259 PMCID: PMC5127058 DOI: 10.1186/s12864-016-3316-8] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 11/18/2016] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Mannheimia haemolytica typically resides in cattle as a commensal member of the upper respiratory tract microbiome. However, some strains can invade their lungs and cause respiratory disease and death, including those with multi-drug resistance. A nucleotide polymorphism typing system was developed for M. haemolytica from the genome sequences of 1133 North American isolates, and used to identify genetic differences between isolates from the lungs and upper respiratory tract of cattle with and without clinical signs of respiratory disease. RESULTS A total of 26,081 nucleotide polymorphisms were characterized after quality control filtering of 48,403 putative polymorphisms. Phylogenetic analyses of nucleotide polymorphism genotypes split M. haemolytica into two major genotypes (1 and 2) that each were further divided into multiple subtypes. Multiple polymorphisms were identified with alleles that tagged genotypes 1 or 2, and their respective subtypes. Only genotype 2 M. haemolytica associated with the lungs of diseased cattle and the sequence of a particular integrative and conjugative element (ICE). Additionally, isolates belonging to one subtype of genotype 2 (2b), had the majority of antibiotic resistance genes detected in this study, which were assorted into seven combinations that ranged from 1 to 12 resistance genes. CONCLUSIONS Typing of diverse M. haemolytica by nucleotide polymorphism genotypes successfully identified associations with diseased cattle lungs, ICE sequence, and antibiotic resistance genes. Management of cattle by their carriage of M. haemolytica could be an effective intervention strategy to reduce the prevalence of respiratory disease and supplemental needs for antibiotic treatments in North American herds.
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Affiliation(s)
- Michael L. Clawson
- United States Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, NE USA
| | | | | | | | - Keith D. DeDonder
- Kansas State University, Manhattan, KS USA
- Veterinary and Biomedical Research Center, Inc, Manhattan, KS USA
| | | | | | | | | | | | - Gennie Schuller
- United States Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, NE USA
| | - Aaron M. Dickey
- United States Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, NE USA
| | - Gregory P. Harhay
- United States Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, NE USA
| | - Michael P. Heaton
- United States Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, NE USA
| | - Carol G. Chitko-McKown
- United States Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, NE USA
| | - Dayna M. Brichta-Harhay
- United States Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, NE USA
| | - James L. Bono
- United States Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, NE USA
| | - Timothy P. L. Smith
- United States Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, NE USA
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Evolving views on bovine respiratory disease: An appraisal of selected key pathogens - Part 1. Vet J 2016; 217:95-102. [PMID: 27810220 PMCID: PMC7110489 DOI: 10.1016/j.tvjl.2016.09.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Revised: 09/27/2016] [Accepted: 09/29/2016] [Indexed: 11/23/2022]
Abstract
Bovine respiratory disease (BRD) is one of the most commonly diagnosed causes of morbidity and mortality in cattle and interactions of factors associated with the animal, the pathogen and the environment are central to its pathogenesis. Emerging knowledge of a role for pathogens traditionally assumed to be minor players in the pathogenesis of BRD reflects an increasingly complex situation that will necessitate regular reappraisal of BRD pathogenesis and control. This review appraises the role of selected key pathogens implicated in BRD pathogenesis to assess how our understanding of their role has evolved in recent years.
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Comparative Methylome Analysis of the Occasional Ruminant Respiratory Pathogen Bibersteinia trehalosi. PLoS One 2016; 11:e0161499. [PMID: 27556252 PMCID: PMC4996451 DOI: 10.1371/journal.pone.0161499] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 08/05/2016] [Indexed: 01/31/2023] Open
Abstract
We examined and compared both the methylomes and the modification-related gene content of four sequenced strains of Bibersteinia trehalosi isolated from the nasopharyngeal tracts of Nebraska cattle with symptoms of bovine respiratory disease complex. The methylation patterns and the encoded DNA methyltransferase (MTase) gene sets were different between each strain, with the only common pattern being that of Dam (GATC). Among the observed patterns were three novel motifs attributable to Type I restriction-modification systems. In some cases the differences in methylation patterns corresponded to the gain or loss of MTase genes, or to recombination at target recognition domains that resulted in changes of enzyme specificity. However, in other cases the differences could be attributed to differential expression of the same MTase gene across strains. The most obvious regulatory mechanism responsible for these differences was slipped strand mispairing within short sequence repeat regions. The combined action of these evolutionary forces allows for alteration of different parts of the methylome at different time scales. We hypothesize that pleiotropic transcriptional modulation resulting from the observed methylomic changes may be involved with the switch between the commensal and pathogenic states of this common member of ruminant microflora.
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DeDonder KD, Harhay DM, Apley MD, Lubbers BV, Clawson ML, Schuller G, Harhay GP, White BJ, Larson RL, Capik SF, Riviere JE, Kalbfleisch T, Tessman RK. Observations on macrolide resistance and susceptibility testing performance in field isolates collected from clinical bovine respiratory disease cases. Vet Microbiol 2016; 192:186-193. [PMID: 27527782 DOI: 10.1016/j.vetmic.2016.07.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 07/12/2016] [Accepted: 07/25/2016] [Indexed: 12/21/2022]
Abstract
The objectives of this study were; first, to describe gamithromycin susceptibility of Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni isolated from cattle diagnosed with bovine respiratory disease (BRD) and previously treated with either gamithromycin for control of BRD (mass medication=MM) or sham-saline injected (control=CON); second, to describe the macrolide resistance genes present in genetically typed M. haemolytica isolates; third, use whole-genome sequencing (WGS) to correlate the phenotypic resistance and genetic determinants for resistance among M. haemolytica isolates. M. haemolytica (n=276), P. multocida (n=253), and H. somni (n=78) were isolated from feedlot cattle diagnosed with BRD. Gamithromycin susceptibility was determined by broth microdilution. Whole-genome sequencing was utilized to determine the presence/absence of macrolide resistance genes and to genetically type M. haemolytica. Generalized linear mixed models were built for analysis. There was not a significant difference between MM and CON groups in regards to the likelihood of culturing a resistant isolate of M. haemolytica or P. multocida. The likelihood of culturing a resistant isolate of M. haemolytica differed significantly by state of origin in this study. A single M. haemolytica genetic subtype was associated with an over whelming majority of the observed resistance. H. somni isolation counts were low and statistical models would not converge. Phenotypic resistance was predicted with high sensitivity and specificity by WGS. Additional studies to elucidate the relationships between phenotypic expression of resistance/genetic determinants for resistance and clinical response to antimicrobials are necessary to inform judicious use of antimicrobials in the context of relieving animal disease and suffering.
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Affiliation(s)
- Keith D DeDonder
- Diagnostic Medicine/Pathobiology, Kansas State University College of Veterinary Medicine, Manhattan, KS, United States.
| | - Dayna M Harhay
- USDA ARS US Meat Animal Research Center, Clay Center, NE, United States
| | - Michael D Apley
- Clinical Sciences, Kansas State University College of Veterinary Medicine, Manhattan, KS, United States
| | - Brian V Lubbers
- Kansas State Veterinary Diagnostic Laboratory, Kansas State University College of Veterinary Medicine, Manhattan, KS, United States
| | - Michael L Clawson
- USDA ARS US Meat Animal Research Center, Clay Center, NE, United States
| | - Gennie Schuller
- USDA ARS US Meat Animal Research Center, Clay Center, NE, United States
| | - Gregory P Harhay
- USDA ARS US Meat Animal Research Center, Clay Center, NE, United States
| | - Brad J White
- Clinical Sciences, Kansas State University College of Veterinary Medicine, Manhattan, KS, United States
| | - Robert L Larson
- Clinical Sciences, Kansas State University College of Veterinary Medicine, Manhattan, KS, United States
| | - Sarah F Capik
- Diagnostic Medicine/Pathobiology, Kansas State University College of Veterinary Medicine, Manhattan, KS, United States
| | - Jim E Riviere
- Institute of Computational Comparative Medicine, Kansas State University College of Veterinary Medicine, Manhattan, KS, United States
| | - Ted Kalbfleisch
- Biochemistry and Molecular Genetics Department, School of Medicine, University of Louisville, Louisville, KY, United States
| | - Ronald K Tessman
- Pharmaceutical Research and Development, Merial, Duluth, GA, United States
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