E. coli is the most frequently isolated pathogen in food-producing animals and also causes major infections in humans, particularly urinary tract infections.
Researchers in France, led by Dr. Clémence Bourély, were interested in determining if E. coli was resistant to two antibiotics: amoxicillin and tetracycline. Resistance to these drugs would indicate that E. coli was resistant to multiple drugs in a variety of animals.
The scientists analyzed 55,904 E. coli isolates and calculated the resistance to both antibiotics in seven animal species: horse, cattle, dog, swine, poultry, duck and turkey. The multi-drug resistance varied between species. More than 20 percent of Escherichia coli isolates taken from the French horses were found to be multi-drug resistant. In cattle, 56 percent of the samples were dual-drug resistant.
This co-resistance was also associated with resistance to other antibiotics, no matter what animal species was studied. The researchers determined that co-resistance to amoxicillin and tetracycline could be indicate multi-drug resistance in E. coli isolates.
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Read the full study here.
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