Prevalence of Escherichia coli isolated from oropharynx and trachea of clinically sick poultry and antimicrobial resistance pattern of the strains isolated oleh Tanima Ferdous, Shaolin Ferdouse, Md. Shahadat Hossain, M. Sohidullah, Yaing Nue Frue Marma, Sabuj Kanti Nath, Paritosh Kumar Biswas