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Mounsey O, Marchetti L, Parada J, Alarcón LV, Aliverti F, Avison MB, Ayala CS, Ballesteros C, Best CM, Bettridge J, Buchamer A, Buldain D, Carranza A, Corti Isgro M, Demeritt D, Escobar MP, Gortari Castillo L, Jaureguiberry M, Lucas MF, Madoz LV, Marconi MJ, Moiso N, Nievas HD, Ramirez Montes De Oca MA, Reding C, Reyher KK, Vass L, Williams S, Giraudo J, De La Sota RL, Mestorino N, Moredo FA, Pellegrino M. Genomic epidemiology of third-generation cephalosporin-resistant Escherichia coli from Argentinian pig and dairy farms reveals animal-specific patterns of co-resistance and resistance mechanisms. Appl Environ Microbiol 2024; 90:e0179123. [PMID: 38334306 PMCID: PMC10952494 DOI: 10.1128/aem.01791-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Accepted: 12/14/2023] [Indexed: 02/10/2024] Open
Abstract
Control measures are being introduced globally to reduce the prevalence of antibiotic resistance (ABR) in bacteria on farms. However, little is known about the current prevalence and molecular ecology of ABR in bacterial species with the potential to be key opportunistic human pathogens, such as Escherichia coli, on South American farms. Working with 30 dairy cattle farms and 40 pig farms across two provinces in central-eastern Argentina, we report a comprehensive genomic analysis of third-generation cephalosporin-resistant (3GC-R) E. coli, which were recovered from 34.8% (cattle) and 47.8% (pigs) of samples from fecally contaminated sites. Phylogenetic analysis revealed substantial diversity suggestive of long-term horizontal and vertical transmission of 3GC-R mechanisms. CTX-M-15 and CTX-M-2 were more often produced by isolates from dairy farms, while CTX-M-8 and CMY-2 and co-carriage of amoxicillin/clavulanate resistance and florfenicol resistance were more common in isolates from pig farms. This suggests different selective pressures for antibiotic use in these two animal types. We identified the β-lactamase gene blaROB, which has previously only been reported in the family Pasteurellaceae, in 3GC-R E. coli. blaROB was found alongside a novel florfenicol resistance gene, ydhC, also mobilized from a pig pathogen as part of a new composite transposon. As the first comprehensive genomic survey of 3GC-R E. coli in Argentina, these data set a baseline from which to measure the effects of interventions aimed at reducing on-farm ABR and provide an opportunity to investigate the zoonotic transmission of resistant bacteria in this region. IMPORTANCE Little is known about the ecology of critically important antibiotic resistance among bacteria with the potential to be opportunistic human pathogens (e.g., Escherichia coli) on South American farms. By studying 70 pig and dairy cattle farms in central-eastern Argentina, we identified that third-generation cephalosporin resistance (3GC-R) in E. coli was mediated by mechanisms seen more often in certain species and that 3GC-R pig E. coli were more likely to be co-resistant to florfenicol and amoxicillin/clavulanate. This suggests that on-farm antibiotic usage is key to selecting the types of E. coli present on these farms. 3GC-R E. coli and 3GC-R plasmids were diverse, suggestive of long-term circulation in this region. We identified the de novo mobilization of the resistance gene blaROB from pig pathogens into E. coli on a novel mobile genetic element, which shows the importance of surveying poorly studied regions for antibiotic resistance that might impact human health.
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Affiliation(s)
- Oliver Mounsey
- University of Bristol, School of Cellular and Molecular Medicine, Bristol, United Kingdom
| | - Laura Marchetti
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
| | - Julián Parada
- Universidad Nacional de Río Cuarto, Facultad de Agronomía y Veterinaria, Río Cuarto, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Laura V. Alarcón
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
| | - Florencia Aliverti
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
| | - Matthew B. Avison
- University of Bristol, School of Cellular and Molecular Medicine, Bristol, United Kingdom
| | - Carlos S. Ayala
- University of Bristol Veterinary School, Langford, United Kingdom
| | | | - Caroline M. Best
- University of Bristol Veterinary School, Langford, United Kingdom
| | - Judy Bettridge
- University of Bristol Veterinary School, Langford, United Kingdom
- Natural Resources Institute, University of Greenwich, Chatham, United Kingdom
| | - Andrea Buchamer
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
| | - Daniel Buldain
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Alicia Carranza
- Universidad Nacional de Río Cuarto, Facultad de Agronomía y Veterinaria, Río Cuarto, Argentina
| | - Maite Corti Isgro
- Universidad Nacional de Río Cuarto, Facultad de Agronomía y Veterinaria, Río Cuarto, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - David Demeritt
- Department of Geography, King’s College London, London, United Kingdom
| | | | - Lihuel Gortari Castillo
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - María Jaureguiberry
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Mariana F. Lucas
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
- Universidad del Salvador, Facultad de Ciencias Agrarias y Veterinarias, Pilar, Argentina
| | - L. Vanina Madoz
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - María José Marconi
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Nicolás Moiso
- Universidad Nacional de Río Cuarto, Facultad de Agronomía y Veterinaria, Río Cuarto, Argentina
| | - Hernán D. Nievas
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
| | | | - Carlos Reding
- University of Bristol, School of Cellular and Molecular Medicine, Bristol, United Kingdom
| | | | - Lucy Vass
- University of Bristol Veterinary School, Langford, United Kingdom
| | - Sara Williams
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
| | - José Giraudo
- Universidad Nacional de Río Cuarto, Facultad de Agronomía y Veterinaria, Río Cuarto, Argentina
| | - R. Luzbel De La Sota
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Nora Mestorino
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
| | - Fabiana A. Moredo
- Universidad Nacional de La Plata, Facultad de Ciencias Veterinarias, La Plata, Argentina
| | - Matías Pellegrino
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
- Universidad Nacional de Río Cuarto, Facultad de Ciencias Exactas, Físico Químicas y Naturales, Río Cuarto, Argentina
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Lucas MF, Errecalde JO, Mestorino N. Pharmacokinetics of azithromycin in lactating dairy cows with subclinical mastitis caused by Staphylococcus aureus. J Vet Pharmacol Ther 2010; 33:132-40. [PMID: 20444037 DOI: 10.1111/j.1365-2885.2009.01128.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Azithromycin is a time-dependent antimicrobial with long persistence. The main characteristics of azithromycin suggest that it could be useful for treating bovine mastitis caused by Staphylococcus aureus. To investigate this possibility, its pharmacokinetic (PK) behavior was studied. Six Holstein lactating cows with subclinical mastitis were administered two 10 mg/kg intramuscular (i.m.) doses of azithromycin, with a 48-h interval. Milk and plasma concentrations were measured by microbiological assay. The MIC(90) was determined in 51 S. aureus isolations to calculate pharmacokinetic/pharmacodynamic (PK/PD) parameters. Milk maximal concentration (C(max)) was 7.76 +/- 1.76 microg/mL (16.67 h post-first administration) and 7.82 +/- 2.18 microg/mL (14 h post-2(nd) administration). In plasma C(max) was 0.18 +/- 0.03 microg/mL (2 h post-1(rst) administration) and 0.11 +/- 0.03 microg/mL (14 h post-2(nd) administration). Azithromycin was eliminated from the milk with a half-life (T(1/2)lambda) of 158.26 +/- 137.7 h after 2(nd) administration, meanwhile plasma T(1/2)lambda resulted shorter(13.97 +/- 11.1 h). The mean area under the concentration vs. time curve from 0 to 24 h (AUC(0-24h)) was 153.82 +/- 34.66 microg.h/mL in milk secretion and 2.61 +/- 0.59 microgxh/mL in plasma. Infection presence in the quarters had a significant effect (P < 0.05) on the area under the concentration vs. time curve from 0 to infinity (AUC(0-infinity)) and clearance from the mammary gland (Cl(mam)/F). Moreover, it had influence on milk bioavailability (F(milk)), T(1/2)lambda, AUC(0-infinity) and mean residence time (MRT) in milk, which values resulted increased in mastitic quarters. In this study, it was determined that the production level and the mammary health status have an influence on PK parameters of azithromycin treatments in bovine mastitis.
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Affiliation(s)
- M F Lucas
- Cátedra de Farmacología, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, Buenos Aires, Argentina
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Mestorino N, Formentini EA, Lucas MF, Fernandez C, Modamio P, Hernández EM, Errecalde JO. Pharmacokinetic disposition of triclabendazole in cattle and sheep; discrimination of the order and the rate of the absorption process of its active metabolite triclabendazole sulfoxide. Vet Res Commun 2007; 32:21-33. [PMID: 17457687 DOI: 10.1007/s11259-007-9000-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2006] [Accepted: 01/26/2007] [Indexed: 11/24/2022]
Abstract
A comparative pharmacokinetic study was conducted to determine the order and the rate of absorption of triclabendazole (TCBZ) in cattle and sheep. A commercial suspension of TCBZ (Biofasiolex, Biogénesis S.A., Argentina) was administered at a dose rate of 10 mg/kg by the oral route to six Holstein female calves and six Corriedale female sheep. The plasma concentration profiles of the metabolites triclabendazole sulfoxide (TCBZ-SO) and triclabendazole sulfone (TCBZ-SO(2)) were analysed by means of the non-compartmental method. The order of the absorption process of the active metabolite, TCBZ-SO, was determined by construction of curves of cumulative absorbed fraction of the drug by means of the Wagner-Nelson method. The appearance of TCBZ-SO in plasma of cattle and sheep resembles the entry of a constant quantity of drug into the organism per unit time. This is explained by the reservoir effect of the rumen, which acts as a biological slow-release system for TCBZ-SO and its precursor TCBZ to the posterior digestive tract where they are absorbed. The plasma concentration profiles of TCBZ-SO in both species were well described by a one-compartment open model with zero-order process of absorption and first-order process of elimination. The values of AUC(0-infinity) and C(max) of TCBZ-SO did not differ between species, while other kinetic parameters except for lambda(z) had higher values in calves than in sheep. In the case of TCBZ-SO(2), t(max) was the only parameter that did not differ between species, while other kinetic parameters except for lambda(z) had higher values in calves than in sheep.
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Affiliation(s)
- N Mestorino
- Cátedra de Farmacología, Farmacotécnia y Terapéutica, Facultad de Ciencias Veterinarias, Universidad Nacional de la Plata, La Plata, Argentina
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Seymour MJ, Lucas MF. Evaluation of sampling and analytical methods for the determination of chlorodifluoromethane in air. Am Ind Hyg Assoc J 1993; 54:253-9. [PMID: 8498360 DOI: 10.1080/15298669391354630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
In January 1989, the Occupational Safety and Health Administration (OSHA) published revised permissible exposure limits (PELs) for 212 compounds and established PELs for 164 additional compounds. In cases where regulated compounds did not have specific sampling and analytical methods, methods were suggested by OSHA. The National Institute for Occupational Safety and Health (NIOSH) Manual of Analytical Methods (NMAM) Method 1020, which was developed for 1,1,2-trichloro-1,2,2-trifluoroethane, was suggested by OSHA for the determination of chlorodifluoromethane in workplace air. Because this method was developed for a liquid and chlorodifluoromethane is a gas, the ability of NMAM Method 1020 to adequately sample and quantitate chlorodifluoromethane was questioned and tested by researchers at NIOSH. The evaluation of NMAM Method 1020 for chlorodifluoromethane showed that the capacity of the 100/50-mg charcoal sorbent bed was limited, the standard preparation procedure was incorrect for a gas analyte, and the analyte had low solubility in carbon disulfide. NMAM Method 1018 for dichlorodifluoromethane uses two coconut-shell charcoal tubes in series, a 400/200-mg tube followed by a 100/50-mg tube, which are desorbed with methylene chloride. This method was evaluated for chlorodifluoromethane. Test atmospheres, with chlorodifluoromethane concentrations from 0.5-2 times the PEL were generated. Modifications of NMAM Method 1018 included changes in the standard preparation procedure, and the gas chromatograph was equipped with a capillary column. These revisions to NMAM 1018 resulted in a 96.5% recovery and a total precision for the method of 7.1% for chlorodifluoromethane. No significant bias in the method was found. Results indicate that the revised NMAM Method 1018 is suitable for the determination of chlorodifluoromethane in workplace air.
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Affiliation(s)
- M J Seymour
- Department of Health and Human Services, Centers for Disease Control, Cincinnati, Ohio 45226
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