Acid-Fast Bacteria

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acid-fast bacteria

[′as·əd ¦fast bak′tir·ē·ə]
Bacteria, especially mycobacteria, that stain with basic dyes and fluorochromes and resist decoloration by acid solutions.

Acid-Fast Bacteria


species of bacteria whose cells are not decolorized by sulfuric acid when stained with carbolfuchsin, owing to the chemical composition of the bacterial cells. The optimal reaction of the culture medium for growing acid-fast bacteria is not acid but neutral. Among acid-fast bacteria are several species of Mycobacterium, including pathogenic ones causing leprosy and tuberculosis in both man and animals and some nitrogen-fixing bacteria found in the soil.

References in periodicals archive ?
2%) were identified as potential positives by the presence of gross internal tissue nodules and acid-fast bacteria in tissue smears (Fig.
Two Mountain Whitefish samples from the 2009-2010 collection, positive for acid-fast bacteria by tissue smear, were examined by histology at WADDL.
Three Rainbow Trout tested positive for acid-fast bacteria by tissue smear and were examined by histology at WADDL.
Effects of extracts from seaweeds on the growth of some acid-fast bacteria," Nippon Saikingaku Zasshi, 11, pp.
Second, the finding that the macrophages in these lesions contained large numbers of acid-fast bacteria supports the conclusion that mycobacterial infection caused the lesion.
Special stains for fungi and acid-fast bacteria were negative.
Various organs and tissues from seven banded mongooses and a suricate were fixed in 10% buffered Formol-saline, embedded in paraffin wax, cut into 4-[micro]m sections, and stained with hematoxylin and eosin, as well as Kinyoun's method for acid-fast bacteria (AFIP modification) (7).
Acid-fast bacteria were detected on Ziehl-Neelsen-stained impression smears, and Mycobacterium species were isolated from both banded mongooses and the suricate specimens.
They discussed acid-fast bacteria, nontuberculous mycobacteria, gram-positive bacteria, and fungi as possible causes (3) but more recently concluded that the specific etiologic agent(s) for HP among workers exposed to (MRF) aerosol remain(s) unknown (2).