Official website of the Johns Hopkins Antibiotic (ABX), HIV, Diabetes, and Psychiatry Guides, powered by Unbound Medicine. Johns Hopkins Guide App for iOS, iPhone, iPad, and Android included. Explore these free sample topics:
-- The first section of this topic is shown below --
- Slow-growing acid fast bacilli (AFB), nontubercular mycobacterium (NTM).
- Runyon classification Group 2: scotochromogen (meaning develops yellow-orange pigment in either the light or the dark; other members include M. szulgai, M. gordonae).
- World-wide distribution; reservoir is soil, water.
- AFB smear appearance is thicker, longer than M. tuberculosis but definitive identification depends on culture.
- Differentiation from other NTM may be difficult.
- DNA probes or 16s ribosomal sequencing useful.
- Newly described M. parascrofulaceum may account for many clinical isolates. Difficult to distinguish in lab from M. scrofulaceum.
- Most closely related to M. simiae.
- Few human cases makes advice about treatment uncertain.