Lineage: Bacteria;Proteobacteria;Betaproteobacteria;Neisseriales;Neisseriaceae;Neisseria

Overview: Bacteria of the genus Neisseria are abundant in the mouth, making up 2-10% of the bacteria at most oral sites.

Ecological role/importance in health and disease: Several of the 20 species of Neisseria in HOMD are common members of the normal oral microflora. For example, N. flavescens, N. perflava, and N. subflava are abundant on the tongue dorsum and N. elongata, N. mucosa, and N. oralis in dental plaque. Other species, such as N. meningitidis and N. gonorrhoeae, are human pathogens included in HOMD as reference sequences even though they are not generally detected in the mouth.

	eHOMD Taxonomy
Life	Cellular Organisms
Domain	Bacteria (773) Abundance
Phylum	Proteobacteria (141) Abundance
Class	Betaproteobacteria (50) Abundance
Order	Neisseriales (31) Abundance
Family	Neisseriaceae (31) Abundance
Genus	Neisseria (20) Abundance
Species	Neisseria bacilliformis (HMT-013) Abundance        Neisseria cinerea (HMT-956) Abundance        Neisseria elongata (HMT-598) Abundance        Neisseria flava (HMT-609) Abundance        Neisseria flavescens (HMT-610) Abundance        Neisseria gonorrhoeae (HMT-621) Abundance        Neisseria lactamica (HMT-649) Abundance        Neisseria macacae (HMT-099) Abundance        Neisseria meningitidis (HMT-669) Abundance        Neisseria mucosa (HMT-682) Abundance        Neisseria oralis (HMT-014) Abundance        Neisseria perflava (HMT-101) Abundance        Neisseria polysaccharea (HMT-737) Abundance        Neisseria sicca (HMT-764) Abundance        Neisseria sp._HMT_018 (HMT-018) Abundance        Neisseria sp._HMT_020 (HMT-020) Abundance        Neisseria sp._HMT_499 (HMT-499) Abundance        Neisseria sp._HMT_523 (HMT-523) Abundance        Neisseria subflava (HMT-476) Abundance        Neisseria weaveri (HMT-092) Abundance