Skip to Content

Runyon classification

Pronunciation: run'yon

Definition: a classification scheme for mycobacteria other than Mycobacterium tuberculosis that divides species into four categories: photochromogens, species that produce a yellow to brown carotene pigment when grown in the presence of light; scotochromogens, which produce pigment in presence or absence of light; nonpigmented, which do not produce pigment; and rapid growers, which grow on solid media in 5–10 days rather than 4–8 weeks. This classification has no clinical or genetic significance but does remain of limited value in identification of some clinical isolates.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.

Hide