en Food Safety and Hygiene Food Safety and Hygiene پژوهشي Original Article <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:times new roman;"><strong>Background:</strong> The present study aimed to determine the antimicrobial effects of <em>Lactobacillus acidophilus</em> and <em>Lactobacillus reuteri</em> against <em>Campylobacter jejuni</em> in fresh and roasted chicken breast fillets.<span dir="RTL"></span><br> <strong>Methods:</strong> Fresh and roasted chicken breast fillets were soaked in probiotic suspensions (11 log CFU/ml) and immersed in <em>C. jejuni</em> suspension (5 and 3 log CFU/ml). Afterwards, the fillets were placed in clean stomacher bags and refrigerated for 10 days until further analysis.<br> <strong>Results:</strong> The count of 5 log CFU/g in the fresh fillets treated with <em>L. acidophilus</em>, <em>L. reuteri</em>, <em>L. reuteri</em>, and <em>L. acidophilus</em> reached 3.45, 3.89, and 4.25 log CFU/g after 10 days of refrigerated storage, respectively. In the roasted fillets, the corresponding counts were estimated at 2.99, 3.54, and 3.92 log CFU/g, respectively. In addition, the inoculated 3 log CFU/g of <em>C. jejuni</em> reached 1.09-1.11 log CFU/g after the refrigerated storage of the fresh and roasted chicken breast fillets.<br> <strong>Conclusion:</strong> According to the results, the addition of <em>L. acidophilus</em> and <em>L. reuteri</em> to the fresh and roasted chicken breast fillets had inhibitory effects against the growth of <em>C. jejuni.</em></span></span></div> Campylobacter jejuni, Lactobacillus acidophilus, Lactobacillus reuteri 110 115 http://jhehp.zums.ac.ir/browse.php?a_code=A-10-291-1&slc_lang=en&sid=1 Yasser Shahbazi yasser.shahbazi@yahoo.com 10031947532846009730 10031947532846009730 Yes Department of Food Hygiene and Quality Control, Faculty of Veterinary Medicine, Razi University, Kermanshah, Iran. Mahya Mozaffarzogh mahya.mozafar@yahoo.com 10031947532846009731 10031947532846009731 No Department of Food Hygiene and Quality Control, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.