In Micro testing, sometimes more than one lot of a particular media is used
(e.g. for a bioburden test, 5 TSA plates from Lot A, and 3 TSA plates from
Lot B). While this is not ideal, sometimes it is required if stocks are
In this case, my experience is that a negative control is required for each
lot of media.
Does anyone know if there is any actual regulatory requirement for this, or
is it just a good lab practice?
Thanks for any feedback,
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