Taxonomy
Family: Flavobacteriaceae
Formerly Flavobacterium indologenes,
Apathogen: C.ginsenosidimutans, C.hagamense, C.joostei, C.oranimense, C.scophthalmum
Natural habitat
They are ubiquitous in the environment, in food products, in an aqueous environment of a hospital, such as; the sink, incubators, water from the tap, hemodialysis systems and all kind of aqueous solutions.
They are not a member of the normal human flora.
Clinical significance
Transmission through contaminated equipment or solutions.
Origin is not always known.
Almost never a clinical significance.
Described as a cause of bacteremia in immunocompromised patients or hospital infection through contaminated instruments
and has been identified as the cause of neonatal meningitis.
No transmission from human to human
Gram negative rods,
0.5 x 1.0-3.0 µm,
often with convex / rounded ends or else seen, thinner in the middle of the cell.
Filamentous forms also occur.
Obligate Aerobic
BA: colonies are smooth, low convex and have a dark yellow pigment (flexirubine) within 3 days and a large β-hemolytic zone.
Only C. indologenes is β-hemolytic.
Colonies without pigment also occur
McConkey: growth, non lactose fermenter (66%)
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