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. 2021 Mar 15;11:5887. doi: 10.1038/s41598-021-85327-x

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© The Author(s) 2021

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(Left) colony observation using an HD colony counter on a Petri dish from stage 3 of a positive BFE test run, inside the red circle cluster of colonies from the same impaction site showing several individual colonies from the same hole easily counted by a modern HD colony counter. (Right) ACI stage with the 400 precision machined jet orifices.