Fig. 3

Detected amplification plot of artificially contaminated Feedstuffs. Red curves 1–3 and blue curves 4–6 represent the amplification plots of gyrB and invA-specific primers, respectively, which correspond to three samples artificially contaminated with Salmonella enteritidis and S. fonticola. Blue curves 7–10 represent the amplification plots of invA-specific primers, which correspond to four samples artificially contaminated with Salmonella enteritidis only