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Inhibition of the E. coli uidA qrtPCR assay. The mean levels of DNA were determined with qrtPCR by adding a template of 1 ng of the standard together with either water or an extraction control of one of the three following DNA extraction methods to triplicate reactions (n = 3): FTA® Elute, the Reischl et al. method and QIAamp® DNA Mini Kit. The dashed line represents part of the standard curve. (Ο) FTA® Elute, (□) QIAamp® DNA Mini Kit, (◊) Reischl, (Δ) Water
