ID#: 19025
These three test tubes had been used in a Legionella pneumophila bacteria detection test, whereupon, if L. pneumophila were present, as in the case of the middle test tube, antibodies that had been conjugated to fluorescein isothiocyanate (FITC), would attach themselves to the antigen, which in this case were the L. pneumophila organisms. When exposed to ultraviolet, or blue-violet light, the FITC molecule attached to the bacterium fluoresces, producing the characteristic apple green glow you see here.
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Content Provider(s): CDC/ Dr. Jim Feeley
Creation Date: 1977
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.