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Antibiotic concentration relation to zone of inhibition formula |
| Answer» My own EXPERIENCES involve measuring with a TRANSPARENT ruler from the back of the PLATE. You measure the diameter of the ZONE of inhibition including the diameter of the disc. The reason for including the disc especially where there is activity is that the disc itself sits in the centre of the zone of inhibition, so the area it OCCUPIES is part of the zone of inhibition. | |