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Abundances of antibiotic resistance cell equivalents per 100 ng DNA derived from total extracted DNA of all 7 WWTPs effluents. Erythromycin resistance was detected by ermB gene abundance, ß-lactam resistance genes were detected by CTX-M32, blaTEM, CMY-2, and CTX-M gene abundances, and tetracycline resistance was detected by tetM gene abundance. Displayed are the median values as well as the quantils [p = 0.25 (dark), p = 0.75 (bright)] and the standard deviations (n = 14).
