{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T19:21:47Z","timestamp":1790882507671,"version":"4.1.0"},"reference-count":83,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2022,10,27]],"date-time":"2022-10-27T00:00:00Z","timestamp":1666828800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"South-Central Regional Department of Bioengineering of the Tecnologico de Monterrey"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>The spread of beta-lactamase-producing bacteria is of great concern and the environment has been found to be a main source of contamination. Herein, it was proposed to determine the frequency of antimicrobial-resistant-Gram-negative bacteria throughout the Lerma River basin using phenotypic and molecular methods. Resistant bacteria were isolated with chromogenic media and antimicrobial susceptibility tests were used to characterize their resistance. ARGs for beta-lactams, aminoglycosides, and quinolones were detected by PCR. Species were identified by Sanger sequencing the 16S rRNA gene and the representative genomes of MDR strains were sequenced by NGS. A high variation in the number of isolates was observed in the 20 sampled sites, while observing a low diversity among the resistant bacteria. Of the 12 identified bacterial groups, C. freundii, E. coli, and S. marcescens were more predominant. A high frequency of resistance to beta-lactams, quinolones, and aminoglycosides was evidenced, where the blaCTX,qnrB, qnrS y, and aac(6\u2032)lb-cr genes were the most prevalent. C. freundii showed the highest frequency of MDR strains. Whole genome sequencing revealed that S. marcescens and K. pneumoniae showed a high number of shared virulence and antimicrobial resistance genes, while E. coli showed the highest number of unique genes. The contamination of the Lerma River with MDR strains carrying various ARGs should raise awareness among environmental authorities to assess the risks and regulations regarding the optimal hygienic and sanitary conditions for this important river that supports economic activities in the different communities in Mexico.<\/jats:p>","DOI":"10.3390\/ijerph192113988","type":"journal-article","created":{"date-parts":[[2022,10,27]],"date-time":"2022-10-27T20:37:58Z","timestamp":1666903078000},"page":"13988","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["High Frequency of Antibiotic Resistance Genes (ARGs) in the Lerma River Basin, Mexico"],"prefix":"10.3390","volume":"19","author":[{"given":"Ana K.","family":"Tapia-Arreola","sequence":"first","affiliation":[{"name":"School of Engineering and Sciences, Campus Queretaro, Tecnologico de Monterrey, Santiago de Quer\u00e9taro 76130, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel A.","family":"Ruiz-Garcia","sequence":"additional","affiliation":[{"name":"School of Engineering and Sciences, Campus Queretaro, Tecnologico de Monterrey, Santiago de Quer\u00e9taro 76130, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hectorina","family":"Rodulfo","sequence":"additional","affiliation":[{"name":"School of Engineering and Sciences, Campus Queretaro, Tecnologico de Monterrey, Santiago de Quer\u00e9taro 76130, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9000-1378","authenticated-orcid":false,"given":"Ashutosh","family":"Sharma","sequence":"additional","affiliation":[{"name":"School of Engineering and Sciences, Campus Queretaro, Tecnologico de Monterrey, Santiago de Quer\u00e9taro 76130, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8860-6020","authenticated-orcid":false,"given":"Marcos","family":"De Donato","sequence":"additional","affiliation":[{"name":"School of Engineering and Sciences, Campus Queretaro, Tecnologico de Monterrey, Santiago de Quer\u00e9taro 76130, Quer\u00e9taro, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Bhullar, K., Waglechner, N., Pawlowski, A., Koteva, K., Banks, E.D., Johnston, M.D., Barton, H.A., and Wright, G.D. 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