Environmental sampling

Microbiology
1

We use 48 hrs pre inubated plates are used for environmental sampling but i dont what reason behind that if any one know kindly explain me

2

Preincubated plates are used to ensure that the plates are properly sterilised and are not contaminated. In contaminated plates, if not properly sterilised or not properly stored, there will be microbial growth . This is to avoid false positive results in environmental samples.

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3

Thank you sir
But regular plating methods we only use control plates for check the contamination during the testing

4

This might be as an additional precaution and assurance that the plates are appropriate for use.