monitoring of antibiotic residue in chicken eggs in tabriz city by fpt

Despite of beneficial effects of antibiotics in treatments of infectious diseases, antibiotic residues in meat, milk, eggs and another products can cause serious side effects for human health. it is clear that, antibiotic residues in food stuff, cause bacterial resistance, allergic reactions, toxicity, carcinogenic effects and change of natural micro flora of intestine in consumers. so, the aim of present study is detection of antibiotic residues contamination rate in chicken eggs. four-plate test (fpt) is one of the microbiologic methods for detecting antibiotic residues in food stuff, which is based on inhibition zone formation around the sample in four culture media with different ph and test bacteria. for this purpose, 60 samples of chicken eggs obtained randomly from market of tabriz city. as a result, after different phases of fourplate test, from total 60 samples, 18 (30%) cases are diagnosed to be contaminated to antibiotic residues that 11 (61.11%) cases relevant to macrolides, 4 (22.22%) cases relevant to aminoglycosides and in 3 (16.66%) cases contaminated to tetracycline. but, there isn’t fluoroquinolones residue in eggs, and the most contamination to antibiotic residues were related to macrolides groups (p<0.05). concluding, the antibiotic residue in chicken eggs has to be monitored as routine test due to their side effects on human health.