A Novel Method to Assess Antimicrobial Susceptibility in Commensal Oropharyngeal <i>Neisseria</i>-A Pilot Study
Commensal <i>Neisseria</i> provide a reservoir of resistance genes that can be transferred to the pathogens <i>Neisseria gonorrhoeae</i> and <i>N. meningitidis</i> in the human oropharynx. Surveillance programs are thus needed to monitor resistance in oropharyngea...
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| Main Authors: | , , , , , , , |
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| Format: | Book |
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MDPI AG,
2022-01-01T00:00:00Z.
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| Summary: | Commensal <i>Neisseria</i> provide a reservoir of resistance genes that can be transferred to the pathogens <i>Neisseria gonorrhoeae</i> and <i>N. meningitidis</i> in the human oropharynx. Surveillance programs are thus needed to monitor resistance in oropharyngeal commensal <i>Neisseria,</i> but currently the isolation and antimicrobial susceptibility testing of these commensals is laborious, complex and expensive. In addition, the posterior oropharyngeal/tonsillar swab, which is commonly used to sample oropharyngeal <i>Neisseria</i>, is poorly tolerated by many individuals. We evaluated an alternative non-invasive method to isolate oropharyngeal commensal <i>Neisseria</i> and to detect decreased susceptibility to azithromycin using selective media (LBVT.SNR) with and without azithromycin (2 µg/mL). In this pilot study, we compared paired posterior oropharyngeal/tonsillar swabs and oral rinse-and-gargle samples from 10 participants and demonstrated that a similar <i>Neisseria</i> species diversity and number of colonies were isolated from both sample types. Moreover, the proportion of <i>Neisseria</i> colonies that had a decreased susceptibility to azithromycin was similar in the rinse samples compared to the swabs. This pilot study has produced encouraging data that a simple protocol of oral rinse-and-gargle and culture on plates selective for commensal <i>Neisseria</i> with and without a target antimicrobial can be used as a surveillance tool to monitor antimicrobial susceptibility in commensal oropharyngeal <i>Neisseria.</i> Larger studies are required to validate these findings. |
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| Item Description: | 10.3390/antibiotics11010100 2079-6382 |