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Result of the optimized PCR protocol detecting C. jejuni, C. coli, and C. lari (upper band), including the internal control (lower band). Lanes: M, molecular size marker; 1, positive control (CCUG 11284); 2, negative control (only internal control is added); 3 to 12, different strains of C. jejuni, C. coli, and C. lari; 13 to 20, other Campylobacter and non-Campylobacter species (strains marked with double asterisks in Table 1).
