Antibiotic disc

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Kirby-Bauer testing: White wafers containing antibiotics shown on plate of bacteria. Circles of poor bacterial growth surround some wafer, indicating susceptibility to the antibiotic
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Kirby-Bauer testing: White wafers containing antibiotics shown on plate of bacteria. Circles of poor bacterial growth surround some wafer, indicating susceptibility to the antibiotic

Antibiotic discs are antibiotic-impregnated paper discs used in Kirby-Bauer antibiotic testing.