EN
The purpose of this study was to determine the prevalence of Enterobacteriaceae and Escherichia coli in selected dairy products on the Warsaw market. Based on the presence or absence of these bacteria the hygienic quality of products was evaluated, and thus the effectiveness of the implementation of the principles of the HACCP system in force in the dairy industry plants and the regularity of the proceedings of the products on the market. Sixty-eight different dairy products were examined: fluid milk, homogenized cheeses, ripened rennet cheeses, cottage cheese type, quark cheeses, yoghurt, kefir, cream, and others. The number of Enterobacteriaceae and the MPN of E. coli were determined according to the PN-ISO 21528-1 norm. 15% of dairy products samples contained Enterobacteriaceae, and 4% of dairy products samples contained E. coli. The occurrence of Enterobacteriaceae in 33% of the fluid milk samples was observed, a level of more than 1 × 10³ in 1 mL. E. coli was not found in 10 mL samples. The highest percentage of samples containing Enterobacteriaceae and E. coli has been discovered in cheeses (quark cheeses, ripened rennet cheeses, cottage cheese type, homogenized), respectively 18% and 11%. The occurrence of Enterobacteriaceae in 14% of sheep cheeses was observed, but no sheep cheese samples contained E. coli. Of the respondent fermented milk drinks, Enterobacteriaceae occurred in only 2 samples of buttermilk. Yoghurt, kefir, cream, and sour milk does not contain Enterobacteriaceae and E. coli in 10 g. The obtained results prove that the currently stricter microbiological requirements implemented towards dairy products have contributed to the improvement in their hygienic quality.