On receipt discs should always be stored at -20°C under dry conditions
Each pack contains 10 rings
Average diameter of zone of inhibition is observed on Mueller Hinton Agar after 18-24 hours incubation at 35-37°C for standard cultures.
Antimicrobial Susceptibility Testing
Flat circular ring of inert material w/ 12 & 8 equidistant arms respectively on the outer & inner periphery, each w/ a 6 mm disc at the end; all the discs impregnated w/different antibiotics, w/corresponding symbols & concentrations printed on the ring.
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