In Europe,E.coli strains isolated from animals in 2007 showed resistance above all to tetracycline, nalidixic acid and ampicillin. Strains isolated from chicken droppings were found to have the greatest resistance of all to both nalidixic acid (17.4%) and ciprofloxacin (37.8%)(3).Resistance to this drug class can be both chromosomal and plasmid (4) and is related to mutations of the target enzymes of these compounds