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Concentration of MS2 bacteriophage, determined by qPCR and reported in PFU equivalents per milliliter, in anaerobically digested sludge diluted 5-fold in water in each of three phases: 46 mL of liquid, 4 mL of wetted solids, and 1 mL of material surface extract for porcelain, concrete, PVC, and polypropylene. Each point represents an experimental replicate.
