ID#: 2189
Under a magnification of 1000X, this photomicrograph of a sputum smear, processed using a fluorescence acid-fast staining method that implements acridine orange fluorescent dye as a counterstain, revealed the presence of a Mycobacterium tuberculosis bacterium. 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 dye, the M. tuberculosis bacteria glow yellow under ultraviolet light microscopy.
High Resolution: Click here for hi-resolution image (6.64 MB)
Content Provider(s): CDC/ Ronald W. Smithwick
Creation Date: 1971
Photo Credit:
CDC Organization
Skip Navigation Links.

Skip Navigation Links.
Copyright Restrictions: None - This image is in the public domain and thus free of any copyright restrictions.