Species diversity of dominant etiologically significant bacteria circulating in industrial poultry

Abstract

The problem of the spread of bacterial infections of birds associated with opportunistic microorganisms occupies a significant place in the modern infectious pathology of birds.The aim of this work is to determine the species diversity of the dominant etiologically significant bacteria circulating in industrial poultry farming. Based on the results for the period 2019 to 2020, we carried out bacteriological studies of pathological material from birds in poultry farms of various technological directions.The dominant species are Escherichia coli, which accounts for 50.7%, Enterococcus faecalis - 25.4%, and Proteus mirabilis - 8.4%. Also, thermophilic Campylobacter spp. - 4.3% were isolated from the organs, including such epidemiologically dangerous species as Campylobacter jejuni. The microorganisms were virulent and differed in their cultural and biochemical properties.Cultures such as Escherichia coli, Proteus mirabilis, Pseudomonas aeruginosa, Enterococcus faecalis are isolated from many organs, which indicates the generalization of the infectious process, the culture of thermophilic Campylobacter spp. were isolated from the liver, which indicates the organotropy of these types of microorganisms.The species composition of the allocated microflora is determined by the epizootic situation in each individual farm, which results in a different percentage of the dominant species.Pure cultures of thermophilic campylobacter were obtained on selective Preston agar with cultivation for 7 days at a temperature of 42 ° C under microaerophilic conditions. However, culturing Campylobacter hepaticus is difficult because it is sensitive to a number of antimicrobial agents used in Campylobacter enrichment media and selective agar.The emergence of new Campylobacter species requires a revision of phenotypic identification algorithms. MALDI TOF mass spectrometry databases need to be updated and specific primers developed to identify new Campylobacter species.Significant variability of indicators of indication of one or another microflora from the liver and gallbladder indicates significant differences in the etiology of bacterial infections of birds.