ID#: 30420
Caption:
This image depicts a close view of a Petri dish agar plate used to perform an Elek test, an in vitro immunoprecipitation (immunodiffusion) assay. This test is used to determine whether a strain of Corynebacterium diphtheriae is toxigenic. Most C. diphtheriae strains in the United States that possess the tox gene do not express it and therefore do not produce diphtheria toxin. Currently, the Centers for Disease Control (CDC) is the only laboratory in the United States that performs the Elek test. Note the precipitin lines formed at the zones of equivalence, indicating a toxigenic strain.
High Resolution: Click here for hi-resolution image (19.79 MB)
Content Provider(s): CDC/ Frances Sottnek
Creation Date: 1977
Photo Credit:
Links:
Categories:
CDC Organization
Skip Navigation Links.

MeSH
Skip Navigation Links.
Copyright Restrictions: Permission is not required for public domain images, however, these images are provided by CDC and are available for personal, professional, and educational use with appropriate attribution. Redistribution must credit CDC and, where known, the individual photographer, and identify the CDC website as the free source. For additional terms see Use of Agency Materials | Other | CDC