For detection of S. Typhimurium, 2 μl of the enriched sampleswas directly
used for qPCR. The oligonucleotide primers (Styinva-JHO-2-left,
5′-TCGTCATTCCATTACCTACC-3′; Styinva-JHO-right, 5′-AAACGTTGAA
AAACTGAGGA-3′) and a probe (5′-FAM-TCTGGTTGATTTCCTGATCGCATAMRA-
3′) targeting 119 bp of nucleotide sequence in the invA gene
were used as described before (Hoorfar et al., 2000).