ID#: 10789
This 1972 image depicts a Mueller-Hinton agar culture plate that had been used in an antibiotic susceptibility test (AST). Known as the Kirby-Bauer method, each of the small, labeled discs, or wafers, contained an antimicrobial agent. The light halos surrounding each disc, also known as reaction zones, represented regions in which the bacteria on the agar’s surface did not thrive, due to their sensitivity to the antibiotic that had been soaked into these respective discs. This image is an enlarged view of a section of PHIL 10784. These tests, which measure the presence or absence of a reaction zone, also take into account the pH of the medium, the concentration of the inoculum, and a number of other factors. Using this method, the sensitivity a bacterial strain has to a given antimicrobial, or combination of antimicrobials, may be determined.
High Resolution: Click here for hi-resolution image (6.56 MB)
Content Provider(s): CDC/ Gilda L. Jones
Creation Date: 1972
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.