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Proportion of A. castellanii Neff amoebae harboring ingested Mycobacterium avium after 60 h of grazing on two bacterial consortia. An E. coli K-12 MG1665 culture and a biologically active carbon (BAC) filter biofilm community were spiked with fluorescently labeled M. avium at proportions between 0.01 and 0.82 on a per mass basis. A linear regression line is plotted (R2 = 0.97), and error bars indicate 95% confidence intervals.
