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Home » Archive » 2023

TDK conference 2023

Susceptibility study of bacterial strains isolated from domestic waterfowl
Eszes Petra - year 6
University of Veterinary Medicine Budapest, Department of Pharmacology and Toxicology
Supervisor: Dr. Ádám Kerek

Abstract:

One of the most significant problems of the 21st century is the global spread of antimicrobial resistance. It is particularly important to carry out regular and extensive testing to assess the situation and monitor changes over time.

The waterfowl sector is an important sector of the poultry industry, which in many cases is less studied and antibiotic use less controlled. We aimed to determine the minimum inhibitory concentration (MIC) values of pathogenic strains causing mortality in ducks and geese for active substances of animal and human health importance and to compare our results with human resistance data.

During a year-long collection study, a total of 349 isolated pathogens were tested for MIC values from dead ducks and geese from 141 towns in the country. Most of the pathogens tested were Escherichia coli (199) and Salmonella spp. (63), followed by Pasteurella multocida, Erysipelothrix rhusiopathiae, Riemerella anatipestifer, Streptococcus spp. and Staphylococcus aureus. Of the Escherichia coli samples, 65% were sensitive to colistin and 64% were sensitive to enrofloxacin; in contrast, 98% resistance to neomycin and 100% resistance to potassium sulphonamide were observed. For Salmonella spp. 67% of strains were sensitive to florfenicol and 57% to doxycycline, but 100% resistance to neomycin. Pasteurella multocida strains (19) were highly susceptible to imipenem (89%), amoxicillin-clavulanic acid (79%), florfenicol (74%) and ceftriaxone (74%). 96% of Erysipelothrix rhusiopathiae strains (18) were resistant to amoxicillin and 72% were susceptible to ceftriaxone. Streptococcus spp. (15 strains) were 80% sensitive to ceftriaxone, 73% to imipenem and 67% to amoxicillin-clavulanic acid. In Staphylococcus aureus (8), 75% were sensitive to imipenem and only 50% to vancomycin. In Riemerella anatipestifer strains, 100% were sensitive to amoxicillin. When comparing human and veterinary resistance data, significant differences were found for Escherichia coli, but very similar results were obtained for Salmonella spp. with penicillin, tetracycline and fluoroquinolone.

Overall, the waterfowl sector, which is concentrated in the Dél-Alföld region, is dominated by infections caused by Escherichia coli and Salmonella spp. In many cases, our results reflected the situation described in the international literature, which certainly underlines the need for representative and periodic surveys of the sector. Further testing of strains by new generation sequencing may be warranted to elucidate the genetic background of multi-resistant strains.



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