# Identification, Serotyping and Antimicrobial Resistance in Ornithobacterium rhinotracheale Isolates from Turkeys in Poland Between 2016 and 2022

## TL;DR

This study analyzed antimicrobial resistance and serotypes of Ornithobacterium rhinotracheale in turkeys in Poland from 2016 to 2022.

## Contribution

The study provides updated data on antimicrobial susceptibility and serotype prevalence in O. rhinotracheale isolates from turkeys in Poland.

## Key findings

- Amoxicillin/clavulanic acid, doxycycline, florfenicol, and lincomycin/spectinomycin were most effective against the isolates.
- Serotype I was the most prevalent, accounting for 29% of the isolates.
- Antimicrobial susceptibility profiles remained relatively stable over the study period.

## Abstract

The increasing number of multidrug-resistant microorganisms that spread within bird populations is a major problem in veterinary medicine. In our study, we assessed the prevalence and antibiotic resistance of Ornithobacterium rhinotracheale strains isolated from turkeys. The obtained results indicate relatively stable antimicrobial susceptibility profiles of isolates.

Respiratory diseases in poultry caused by Ornithobacterium rhinotracheale represent a significant challenge from both therapeutic and economic perspectives. Treatment of them, which uses antimicrobial agents, improperly contributes to the emergence and dissemination of multidrug-resistant strains within avian populations. The present study, based on O. rhinotracheale isolates (n = 733) obtained from the respiratory tract, joints, and organs of turkeys in Poland between 2016 and 2022, was conducted to assess the antimicrobial resistance of the strains and identify their serotypes. All O. rhinotracheale isolates were tested for antimicrobial susceptibility using the disk-diffusion method. The results of this study indicated that amoxicillin/clavulanic acid, doxycycline, florfenicol, and lincomycin/spectinomycin were the most effective agents against the isolates from turkeys. The findings showed that serotype I was the most prevalent among the tested turkey strains in Poland and was the serotype to which 29% of the O. rhinotracheale isolates affiliated.