Abstract
Summary The aim of this study was to investigate the presence of Bacillus cereus and to detect enterotoxigenic genes in dairy dessert samples utilising a multiplex PCR technique. A total of 100 samples, 25 keskul, 12 tavuk gogsu, 12 kazandibi, 30 supangle, 4 profiteroles and 17 sutlac were analysed. B. cereus contamination was found in 7 of 100 (7.0%) samples including 3 (25%) tavuk gogsu, 2 (6.6%) supangle, 1 (4%) keskul and 1 (5.8%) sutlac. The average number of B. cereus was between 2.0×10 1 - 5.0×10 2 cfu/g in these dairy dessert samples. A total of 20 isolates were collected from the 7 positive samples. The results indicated that 30% (6/20) of B. cereus isolates contain three enterotoxic HBL complex encoding genes hblA, hblC and hblD, whereas 70% (14/20) had no hbl genes. In addition, all three enterotoxic NHE complex encoding genes, nheA, nheB and nheC, were detected in 40% (8/20), two nhe genes (nheA and nheB) were found in 45% (9/20) and one nhe gene (two nheA and one nheB) was found in 15% (3/20) of the isolates. The ctyK1 gene was not detected in any sample. The presence of B. cereus and their enterotoxigenic genes in dairy desserts may be a potential risk for public health.
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