Abstract

Binjai is one of the cities in North Sumatra Province Indonesia, with the second largest layer chicken population in North Sumatra. Studies on the use of antibiotics in layer chicken farms in North Sumatra, especially in Binjai, are still relatively minimal, so studies are still needed to find out the picture of antibiotic use and levels of antibiotic resistance. The aim of this study was to determine the level of resistance of pathogenic E. coli bacterial strains to antibiotics in layers of chicken farms in the city of Binjai and to find out which pathogenic E. coli bacterial strains O157:H7 are resistant type of antibiotic Tetracycline and Penicillin. The data were analyzed using a multivariable logistic regression model (SPSS). The results of antimicrobial resistance (AMR) testing against 9 types of antibiotics showed that the antibiotic Amoxicillin has the highest level of resistance. Based on the results of the analysis of risk factors for the occurrence of pathogenic E. coli strains in 120 isolates, there were possible causes for the occurrence of pathogenic E. coli at the research location, basically poor cage cleanliness and the provision of antibiotics as a preventative, through drinking water, so that the dosage were unmeasured and usage patterns were inappropriately monitored.