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This is a photomicrograph of a sputum smear sample, which was stained using a fluorescent acid-fast staining method (Smithwick), thereby, revealing the presence of Mycobacterium tuberculosis bacteria. M. tuberculosis is an acid-fast bacterium (AFB), and is therefore, undetectable when stained using a Gram stain technique. However, using this method, the M. tuberculosis bacteria glow yellow under ultraviolet light microscopy.
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Content Providers(s):CDC/ Ronald W. Smithwick
Creation Date:1971
Photo Credit:
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.