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Gel electrophoresis of the amplified products by allele-specific PCR assays 1 and 2. Lanes: M, 100-bp ladder; WT, ATCC 9797 B. pertussis reference strain (erythromycin sensitive); MT, clinical B. pertussis isolate (erythromycin resistant); S, clinical NP swab; N, negative control of PCR.
