Colonies are round, smooth, glistening, and light gray. Grows well on chocolate agar
and sheep blood agar forming 0.5-1 mm diameter colonies after 24 h incubation.
Non-haemolytic. No growth on modified Thayer-Martin agar. Grows in air + 5% CO2 at
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Neisseriaceae, Genus Neisseria, Neisseria bacilliformis
Han et al. 2006.
Gram-negative bacilli, 0.6 / 1.3-3.0 μm. Non-motile.
Isolated from human infections.
Susceptible to amikacin, imipenem, ticarcillin/clavulanate, and trimethoprim+sulfamethoxazole.
It may be an opportunistic human pathogen, causing infections that are related to the oral cavity and respiratory tract. Blood invasion
may also occur. One report of endocarditis possibly caused by N. bacilliformis.
- Han XY, Hong T, Falsen E. Neisseria bacilliformis sp. nov. isolated from human infections. J Clin Microbiol. 2006 Feb; 44(2):474-
Some tests are based on API 20NE, identification codes: 1000004 and 0000004.
API may misidentify these codes as Moraxella spp.
Positive results for oxidase.
Negative results for arginine dihydrolase, citrate utilization, esculin hydrolysis, gelatin hydrolysis, PNPG, indole production, urease,
acid production from: dextrose, lactose, maltose & sucrose.
Variable results for catalase, nitrate reduction & tributyrin hydrolysis.
(c) Costin Stoica