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Detection of STEC in postspiked ground beef by the AmpliSensor PCR assay: extent of amplification versus cycle number and initial copy number of target DNA. Symbols: ■, no STEC; +, 112 CFU/ml; •, 1,120 CFU/ml; □, 11,200 CFU/ml; ▴, 112,000 CFU/ml.
