Exercise ] Measure the zones of inhibition for each antibiotic on the plates shown in Figure I and note the measurements in the spaces in Table I below . ( Note : The Kirby-Bauer method is standardized so that no zone of inhibition is scored as a O , and all others include the disk as part of the zone . ) Key : PE = penicillin , ME = methicillin , CE = cephalothin , and VA = vancomycin* Plate S. aureus MRSA PE ME 1 CE VA PE ME 2 CE VA PE ME 3 CE VA