In this study, the authors have conducted a search of antibiotic residues in commercialized milk in Constantine region (North East Algeria). In order to assess the level of contamination in the region, because no control is applied until now. Sampling concerned cow's milk produced locally as well as imported milk powder. The search was conducted using Delvotest®, a microbiological inhibition test for a qualitative detection of antibiotics residues, especially β -lactams antibiotics. A total of 180 samples were analysed: 120 samples of local milk and 60 samples of imported one. Statistical analysis will focus on the percentages of contamination which will be compared by applying chi-square tests (χ2). Results showed that 40% of milk samples produced locally are contaminated with antibiotics residues. While contamination in imported milk is much lower (5%). Statistical analysis showed a significant difference in contamination levels between local and imported milk samples. These results should urge local authorities to establish an effective control of the entire dairy industry to prevent potential risks caused by antibiotics residues.
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