ABSTRACT
The Escherichia coli is responsible for the avian colibacilosis, one of the main diseases in modern industrial aviculture, and the treatment with antibiotics and quimiotherapics is one of the ways to atenuate the impact of the colibacilosis. Eighty-six samples of Escherichia coli were studied, isolated from aerial sacks of chickens with breathing problems. The chickens were originally from the Descalvado region, State of São Paulo. Out of the studied samples, 66 were isolated from broilers and 20 from breeders. With the isolated strains, a susceptibility test was performed, the technique was described by Bauer and Kirby. Amoxicillin, acid oxolinic, fosfomicin, norfloxacin and sulfamethoxazole-trimethoprim were tested. The objective of the present work was presenting different profiles of resistance of avian E. coli strains to the mentioned drugs. In the isolated strains from the breeders, percentage of resistance to fosfomicin (70%), amoxicillin (60%), oxolin acid (60%), norfloxacin (50%), sulfamethoxazole-trimethoprim (50%) was observed. In the isolated strains from the broiler, percentage of resistance to oxolin acid (87.9%), norfloxacin (75.8%), sulfamethoxazoletrimethoprim (66.7%), amoxicillin (60.6%) and fosfomicin (45.4%) was observed. This study, showed the high profile of resistance of E. coli of avian origin for the mentioned drugs, thus pointing out, the importance of the recommendation of antimicrobian drugs be preceded by a susceptibily test.
KEY WORDS:
Antimicrobian; poultry; Escherichia coli; susceptibility test.
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