ID#: 10852
Caption:
This image reveals the results of an Antimicrobial Susceptibility Test-E™, and a disk diffusion test, used to determine the antimicrobial susceptibility of group-B strep (GBS). The long strip on the left is called the E-testTM, and implemented the drug azithromycin. The strip contained a gradation of antibiotic, the strongest concentration at the top of the strip. Where the growth of the bacteria starts, or the area of the growth where the elliptical halo meets the strip towards the bottom determines the minimum inhibitory concentration of antibiotic that will inhibit the bacteria. The two disks on the right were imbibed with erythromycin (bottom) and tetracycline. Each was surrounded by a halo, referred to as the zone of inhibition.
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Content Provider(s): CDC/ Dr. Richard Facklam
Creation Date: 2008
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Copyright Restrictions: None - This image is in the public domain and thus free of any copyright restrictions.