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Galindo-Méndez M, Navarrete-Salazar H, Pacheco-Vásquez R, Quintas-de la Paz D, Baltazar-Jiménez I, Santiago-Luna JD, Guadarrama-Monroy L. Detection of Plasmid-Mediated Resistance against Colistin in Multi-Drug-Resistant Gram-Negative Bacilli Isolated from a Tertiary Hospital. Microorganisms 2023; 11:1996. [PMID: 37630556 PMCID: PMC10458375 DOI: 10.3390/microorganisms11081996] [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: 06/29/2023] [Revised: 07/29/2023] [Accepted: 07/31/2023] [Indexed: 08/27/2023] Open
Abstract
The aim of this study was to determine the prevalence of plasmid-mediated colistin resistance mcr-1 to mcr-5 genes among colistin and multi-drug-resistant Gram-negative bacilli strains isolated from patients in a tertiary hospital in Toluca, Mexico. The presence of mcr genes among the 241 strains collected was assessed by PCR. In the case of mcr-carrying E. coli, further PCR tests were performed to determine the presence of blaCTX-M and whether the strains belonged to the O25b-ST131 clone. Conjugation experiments were also carried out to assess the horizontal transmission of colistin resistance. A total of twelve strains (5.0%), of which four were E. coli; four were P. aeruginosa; three were K. pneumoniae, and one E. cloacae, were found to be resistant to colistin. Of these strains, two E. coli isolates were found to carry mcr-1, and Southern blot hybridization demonstrated its presence on an approximately 60 kb plasmid. Both mcr-1-carrying E. coli strains were found to co-express blaCTX-M, belong to the O25b-ST131 clone, and horizontally transmit their colistin resistance. The results of this study confirm the presence of plasmid-mediated colistin resistance in hospitalized patients in Mexico and demonstrated that the multi-drug-resistant O25b-ST131 E. coli clone can acquire mcr genes and transmit such resistance traits to other bacteria.
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Affiliation(s)
- Mario Galindo-Méndez
- Laboratorios Galindo SC, Av Juárez 501-A, Col Centro, Oaxaca 68000, Oax, Mexico
- School of Medicine, Universidad Anáhuac Oaxaca, Blvd. Guadalupe Hinojosa de Murat 1100, San Raymundo Jalpam 71248, Oax, Mexico
| | - Humberto Navarrete-Salazar
- School of Medicine, Universidad Anáhuac Oaxaca, Blvd. Guadalupe Hinojosa de Murat 1100, San Raymundo Jalpam 71248, Oax, Mexico
| | - Reinaldo Pacheco-Vásquez
- Centro Médico ISSEMYM Toluca, Av. Baja Velocidad KM. 57.5, Carr. Mex./Tol. Col. San Jeronimo Chicahualco, Metepec 52170, Edomex, Mexico
| | - Devanhí Quintas-de la Paz
- School of Medicine, Universidad Anáhuac Oaxaca, Blvd. Guadalupe Hinojosa de Murat 1100, San Raymundo Jalpam 71248, Oax, Mexico
| | - Isabel Baltazar-Jiménez
- School of Medicine, Universidad Anáhuac Oaxaca, Blvd. Guadalupe Hinojosa de Murat 1100, San Raymundo Jalpam 71248, Oax, Mexico
| | - José David Santiago-Luna
- School of Medicine, Universidad Anáhuac Oaxaca, Blvd. Guadalupe Hinojosa de Murat 1100, San Raymundo Jalpam 71248, Oax, Mexico
| | - Laura Guadarrama-Monroy
- Centro Médico ISSEMYM Toluca, Av. Baja Velocidad KM. 57.5, Carr. Mex./Tol. Col. San Jeronimo Chicahualco, Metepec 52170, Edomex, Mexico
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