Taxonomy
Family: Micrococcaceae
Natural habitats
Micrococci are widespread in nature and are commonly found on the skin of humans and other mammals.
Clinical significance
K. rosea found in environmental sources and human skin.
It is considered part of the normal skin flora, but it can be an opportunistic pathogen.
In clinical settings, it has been associated with infections such as bacteremia, endocarditis, and skin and soft tissue infections, particularly in immunocompromised individuals or those with underlying medical conditions.
It is generally sensitive to many antibiotics, though antibiotic resistance can occur.
Gram positive cocci,
0.5-3.5 µm,
occurring mostly tetrads, and irregular clusters.
Mature cells lose the ability to retain the crystal violet, which makes them decolorization easier than younger cells.
Obligate aerobic
BA: after 48 hours the colonies are 1-2 mm in diameter (grow more slowly than staphylococci).
Colonies dull or matte, convex and have a pink to orange-red pigment..
McConkey: growth
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