If there is no zone of inhibition in disk diffusion result, it is measure as 6 mm (including the disk paper) or 0 mm?

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Marwan M. A. Mohammed

Hello, If there is no zone of inhibition the reading should be 0 mm.

more detail could be found here https://asm.org/getattachment/2594ce26-bd44-47f6-8287-0657aa9185ad/Kirby-Bauer-Disk-Diffusion-Susceptibility-Test-Protocol-pdf.pdf page 17.

Sirikarnnapa Krajangcharoensakul

we reading should be 0 mm because

no zone of inhibition.

Kimutai Nicholas K.

Yes you include the disk diameter as 6mm, of course you will have explain in methods that the diameter of the disk was 6mm

Bharti Sharma

If there is no zone of inhibition, then reading should be 0 mm.

Tom M. Isyaka

There is no zone of inhibitions and the reading is 0 mm. Yes it is the radius of the inhibition zone that is measured, therefore, it includes the disk.

Mohammed Al-Saady

Hi, without a zone of inhibition, yes, it would be 0mm.