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Analytical assay comparison of grab samples. Traditional culture method results (light gray bars) and RV-PCR method results (dark gray bars). True-positive or true-negative results represented by solid fill, false-positive results represented by diagonal stripe pattern, and false-negative results represented by zig zag pattern. SBWASH, small boat washdown water; GRAVEL, gravel parking lot; VEGE, grass vegetation. Controls are reagent or field blanks processed with samples
