You have 100 plastic components.
You use 5 flask and test 20 components per flask.
You get these results:
1: 0 CFU
2: 0 CFU
3: 0 CFU
4: 0 CFU
5: 0 CFU
Should you report the overall results as:
(0+0+0+0+0) = 0 CFU
or if you say that 0 CFU = NMT 1 CFU
(NMT 1+ NMT 1+ NMT 1+ NTM 1+ NMT 1) = NMT 1 CFU
(NMT 1+ NMT 1+ NMT 1+ NTM 1+ NMT 1) = NMT 5 CFU
or if NMT 1 CFU = 1 when used in calculations
(1+1+1+1+1) = 5 CFU
M.Sc., Research Scientist
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