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Agarose gel electrophoresis of “O” antigen detection by PCR with primers RfbR/RfbR (292pb). Lines 1 and 16 denotes molecular weight (DNA Ladder 100 bp); line 15 display positive control (INCQS 00171); lines 2–5, 7, 8, 10, 12 and 13 positive samples; line 14 negative control; lines 6, 9 and 11 negative samples.
