{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T08:42:28Z","timestamp":1790757748146,"version":"4.1.0"},"reference-count":129,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2022,6,24]],"date-time":"2022-06-24T00:00:00Z","timestamp":1656028800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100010269","name":"Wellcome Trust","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100010269","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100008172","name":"Meningitis Now","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100008172","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cell. Infect. Microbiol."],"abstract":"<jats:p><jats:italic>Neisseria meningitidis<\/jats:italic> and <jats:italic>Neisseria gonorrhoeae<\/jats:italic> are two obligate human pathogens that have evolved to be uniquely adapted to their host. The meningococcus is frequently carried asymptomatically in the nasopharynx, while gonococcal infection of the urogenital tract usually elicits a marked local inflammatory response. Other members of the <jats:italic>Neisseria<\/jats:italic> genus are abundant in the upper airway where they could engage in co-operative or competitive interactions with both these pathogens. Here, we briefly outline the potential sites of contact between <jats:italic>Neisseria<\/jats:italic> spp. in the body, with emphasis on the upper airway, and describe the growing yet circumstantial evidence for antagonism from carriage studies and human volunteer challenge models with <jats:italic>Neisseria lactamica<\/jats:italic>. Recent laboratory studies have characterized antagonistic mechanisms that enable competition between <jats:italic>Neisseria<\/jats:italic> species. Several of these mechanisms, including Multiple Adhesin family (Mafs), Two Partner Secretion Systems, and Type VI secretion system, involve direct contact between bacteria; the genetic organisation of these systems, and the domain structure of their effector molecules have striking similarities. Additionally, DNA from one species of <jats:italic>Neisseria<\/jats:italic> can be toxic to another species, following uptake. More research is needed to define the full repertoire of antagonistic mechanisms in <jats:italic>Neisseria<\/jats:italic> spp., their distribution in strains, their range of activity, and contribution to survival <jats:italic>in vivo<\/jats:italic>. Understanding the targets of effectors could reveal how antagonistic relationships between close relatives shape subsequent interactions between pathogens and their hosts.<\/jats:p>","DOI":"10.3389\/fcimb.2022.913292","type":"journal-article","created":{"date-parts":[[2022,6,24]],"date-time":"2022-06-24T07:43:58Z","timestamp":1656056638000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":16,"title":["Et tu, Neisseria? 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