NCIt definition : A species of obligately anaerobic, Gram negative, rod shaped bacteria assigned to
the phylum Firmicutes. This species is nonmotile, indole, oxidase and catalase negative,
and nonfermentative. J. ignava is commonly found in the gingival crevices of the oral
cavity and may cause gingivitis and periodontitis.;
Alternative definition : CDISC: Any bacterial organism that can be assigned to the species Johnsonella ignava.;