Antimicrobial efficacy

For cream form must i doing the antimicrob efficacy test

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use filtration method and wash by sterilized water ,then inoculate the filter , i think it is enough

Filtration of cream is not possible with filter of 0,45micro.
Think you for your help

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use diluent before filtration

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Thanks but the cream is not an aqueous form
So is it necessary to do the test

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dilute then pour 0.1 ml directly on agar plate

Before heat the container that contain cream at 45 at water bath and doing the test by pour plate method

Thanks i do it for property test but for effective antimicrobial we must inoculated the germs. So must I do it like syrup.