ETHIOLOGICAL STRUCTURE OF BACTERIAL INFECTIONS OF GROWING MULARDS AND SENSITIVITY TO ANTIMICROBIAL AGENTS

Mihni Lyutskanov, Valentina Urumova, Koicho Koev, Georgi Zhelev

Abstract: Analyses were performed of the composition of microbial factors responsible for emergence infectious processes of hatchlings and growing Mulard with epidemic manifestation. The references of isolates of dominant species were checked to antimicrobial agents to optimize measures for prevention and control. The object of the study are 1 hatchery and 4 farms. The bacterial findings are analyzed in three age groups: the first week after hatching, the period from 2nd to 5th week of life and the period from 6th to 10th week. Overall, researches have isolated microbial strains belonging to at least 8 taxonomic categories. Enterobacteriaceae predominate and most often dominated E. coli isolates. During the 2 - to 5 nd week of life among the dominant species E. coli, increasingly establishes the presence of Salmonella spp. and
Riemerella anatipestifer, and in the third age category (6th - 10 - week) most frequently found representatives of Pasteurellaceae. E. coli strains showed preserved sensitivity to aminoglycosides, colistin, and fluoroquinolones, but there is an increase in the percentage of resistant to tetracyclines, amoxicillin and potentiated with trimethoprim sulfonamides. Pasteurella spp. strains show relatively preserved sensitivity to all antimicrobial testings.

Keywords: antinicrobials; bacterial infection; duck- mulard; resistance; sensitivity

Date published: 2023-03-01