Liver swab samples were collected from 60 broiler farms suffering from colibacillosis nationwide in 2018. The swabs were placed in transport medium (Noble Bio, Hwaseong, Korea) and sent to the laboratory in a cooler. All specimens were inoculated into 10 mL of modified E. coli broth with Novobiocin (Merck, Darmstadt, Germany) within 24 h of collection.
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