acid-fast bacillus


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acid-fast bacillus (AFB)

a type of bacillus that resists decolorizing by acid after accepting a stain. Examples include Mycobacterium tuberculosis and M. leprae.

ac·id-fast ba·cil·lus

(AFB) (asid-fast bă-silŭs)
A type of bacterium that reacts in a given way when treated with an acid bath.

acid-fast bacillus

Abbreviation: AFB
A bacillus not readily decolorized by acids or other means when stained. Mycobacterium tuberculosis is an acid-fast bacillus.
See also: bacillus
References in periodicals archive ?
Guidelines proposed by Centers for Disease Control and Prevention (CDC) include a 24-hour TAT from receipt of the specimen to reporting results for the acid-fast bacillus (AFB) smear, 14 days for detection of growth, 21 days for identification of Mycobacterium tuberculosis, and 28 days for susceptibility testing.
Tuberculosis and granulomatous fungal infections were excluded by negative acid-fast bacillus and fungal stains and culture.
Brain biopsy should be sent for acid-fast bacillus smear and culture, and possibly for Mycobacterium tuberculosis polymerase chain reaction, in any patient with granulomatous changes seen on pathologic examination.