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You'd have to be more specific in your question. However, disks are often laden with antibiotics to see if a bacteria is resistant or susceptible to that antibiotic. The disk is placed on a nutrient agar and then bacteria is spread onto that disk. If the bacteria is susceptible to that antiobiotic, it will grow on the nutrient plate, but not around the disk containing the antibiotic. The larger the clear area around the disk, the more susceptible the bacteria is to that antibiotic. If it is resistant to that antiobiotic, it will grow on the plate and adjacent to the antibiotic laden disk indicating that antibiotic is not effective towards that particular bacterial strain. In one such test the A disk had bactracin. However, I am not comfortable saying that all A disks have bactracin. How the disk is labeled may differ.

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