First Case in the United States of Neisseria gonorrhoeae with resistance-conferring mutation identified
In November 2019, the Southern Nevada Public Health Laboratory of the Southern Nevada Health District (SNHD) identified a male urethral gonococcal isolate later demonstrating reduced susceptibility to cefixime (minimum inhibitory concentration [MIC] = 2.0 μg/mL) and ceftriaxone (MIC = 1.0 μg/mL) but susceptible to azithromycin (MIC = 0.25 μg/mL). Molecular testing by CDC in the United States revealed the emerging mosaic penA60 allele, first identified in Japan in 2016, which confers reduced susceptibility to cephalosporins and increases the risk for treatment failure. The penA60 allele has been identified in China, Canada, Denmark, Australia, France, and the United Kingdom. The Nevada case is the first identified case of a Neisseria gonorrhoeae isolate harboring the mosaic penA60 allele reported in the United States.
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