I submitted water samples for bioburden analysis to a contract laboratory.
The plates were to be read at 3 and 5 days of incubation. Day 5 fell on a
Sunday. The technician removed the plates from the incubator on Saturday
(Day 4) and placed them in the refrigerator (2 to 8 deg C) until Monday
morning, and then returned them to the proper incubation temperature to
continue the final day of incubation. The thinking was that no one would be
there to read the plates on Day 5, so it was better to place them under
refrigeration for 24 hrs and then reincubate and obtain "Day 5" results.
I have never heard of this practice. I would like to know if anyone has
heard of doing this, is it acceptable?
Thank you in advance for your help.
Dawn M. McCabe, RM(NRM)
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