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Description:This fluorescent acid-fast stained (Smithwick) photomicrograph revealed the presence of Mycobacterium tuberculosis bacteria in a sputum smear.
M. tuberculosis is an acid-fast bacterium (AFB), and is therefore, undetectable when stained using a Gram-stain technique. However, using the Smithwick method, which employs acridine orange as the specific stain, the M. tuberculosis bacteria glow yellow under ultraviolet light microscopy.
High Resolution: Click here for hi-resolution image (18.27 MB)
Content Providers(s):CDC/ Ronald W. Smithwick
Creation Date:1971
Photo Credit:
Links:CDC - National Center for HIV, STD and TB Prevention - Div. of TB Elimination
CDC Organization
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Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.