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Use of whole genome sequencing for the molecular comparison of Neisseria gonorrhoeae isolates with decreased susceptibility to extended spectrum cephalosporins from two geographically different regions in America



Use of whole genome sequencing for the molecular comparison of Neisseria gonorrhoeae isolates with decreased susceptibility to extended spectrum cephalosporins from two geographically different regions in America



Sexually Transmitted Diseases 2019



Neisseria gonorrhoeae isolates with reduced susceptibility or resistance to the recommended first-line antimicrobial therapy have been described in several countries. The purpose of this study was to use genome analyses to compare the molecular characteristics of N. gonorrhoeae isolates with decreased susceptibility to extended-spectrum cephalosporin (ESC) from Ontario, Canada, and Argentina. A total of 128 N. gonorrhoeae isolates, collected in 2015, were included. The susceptibility to penicillin G, tetracycline, ciprofloxacin, cefixime, ceftriaxone and azithromycin was determined using the agar dilution method. Isolates were subjected to whole genome sequencing, and an in silico analysis was performed to identify antimicrobial resistance determinants and for genotyping. Decreased susceptibility to ESC was mainly associated with penA mosaic allele 34.001, together with an mtrR promoter A deletion and porB1b alterations G120K/A121N. N. gonorrhoeae multiantigen sequence typing (NG-MAST) ST1407 or closely related genotypes were identified circulating in both regions. An international multi-drug resistant clone of N. gonorrhoeae was associated with decreased susceptibility to ESC in two different regions in America. Evidence of clonal dissemination of the organism in some regions, suggest that the strength of surveillance programs and establishment of collaborative projects are essential.

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Accession: 066789434

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PMID: 31095062


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