due to the existence of antibiotic resistant encoding genes in plasmid. Duck meats and eggs like other poultry species are important dietary sources with high quality protein, energy, and some vitamins and minerals (Adzitey, 2011b). The Department of Veterinary Services Malaysia (2009) reported that duck population increased around 154% between 1996 to 2004 in Malaysia. Currently, Malaysia is also the third world producer of duck meats (FAO, 2009). This presents opportunities for increase duck production and consumption in Malaysia. The consumption of duck meat, eggs or products contaminated with pathogenic Escherichia coli can lead to foodborne infection and if the pathogenic Escherichia coli involved in the infection is resistant to multiple antibiotics, treatment of infected persons can be difficult and fatal. The objective of this study was to determine the antibiotic resistance and plasmid sizes of Escherichia coli isolated from ducks in Penang, Malaysia.
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