Hi Nagma,

Yes, you can calculate bacterial % growth inhibition.

However, it depends on the process you are using to perform the antibacterial test and how you are analyzing the data. If you are using the broth-dilution method, the best way is to perform a fluorometric analysis (Resazurin assay or an MTT assay) or check OD600. In that case, you can normalize your data (intensity or absorbance of bacteria with treatment) considering a 100% growth in your control group (ie. bacteria without treatment).

You may refer to one of our published articles.

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Thank you, Satwik Majumder

suppose, if considered in context of fixed time of exposure, you could estimate % inhibition. Don't know why - it would certainly vary between isolates and would be of no obvious practical significance.

Thank you, Phil Geis