Taxonomy
Family: Flavobacteriaceae
Formerly known as Flavobacterium and Chryseobacterium meningosepticum
Natural habitat
They are ubiquitous in the environment, in food products, and in an aqueous environment of the hospital, such as the sink, incubators, tapwater, or hemodialysis systems.
They are not a member of the normal human flora.
Clinical significance
The species are also a rare cause of nosocomial infections including bacteremia, pneumonia, endocarditis and meningitis, especially in immunocompromised patients.
Several studiessuggest that E. anophelis, and not E. meningoseptica, is the predominant human pathogen of this genus, but the identification of this species is difficult.
Gram negative rods,
0.5 x 1.0-3.0 µm,
filamentous forms also occur.
Obligate Aerobic
BA: colonies are smooth, shiny and quite large (1-2 mm after 24 hours) produce no or weak yellow or light salmon-colored pigment after 2-3 days.
The greyish discoloration around the colonies on blood agar is due to the proteases & gelatinase.
McConkey: they grow poorly or not at all
(26% of isolates)
BBAØ: no growth
James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition
Karen C. Carrol et al (2019) Manual of Clinical Microbiology, 12th Edition