Study on susceptibility of Salmonella from livestock and poultry to drugs and comparison of two testing methods.

The susceptibilities of 36 Salmonella strains isolated from livestock and poultry products to 16 antibiotics were tested by using Kirby-Bauer slip-diffusion method(K-B method) and the method of BioMerieux ATB Expression automatic identification(ATB method).The statistical results showed that there were significant differences in the testing results of Salmonella susceptibility to Amoxicillin/Clavulanic acid,Imipenem and Sulfamethoxazole-trimethoprim between ATB method and K-B method(P 0.05),but no significant differences in the testing results were found between the two methods for other 13 antibiotics.All the isolated strains were resistant to one or more antibiotics,and 58% of the strains were resistant to two or more antibiotics.In summary,ATB method still could not completely replace K-B method in the studies on the drug susceptibility of Salmonella strains derived from livestock and poultry.The isolated strains had stronger drug resistance,and their drug-resistant spectrum also continued to expand.