Study of the pathogenic properties of Avibacterium paragallinarum cultures isolated in 2019

Study of the pathogenic properties of Avibacterium paragallinarum cultures isolated in 2019–2020

Published:2022-12-22 Issue:3-4 Volume:8 Page:3-7
ISSN:2411-0388
Container-title:Journal for Veterinary Medicine, Biotechnology and Biosafety
language:en
Short-container-title:J. Vet. Med. Biotechnol. Biosafety

Author:

Kolesnykov A. O.¹^ORCID,Stegniy B. T.¹^ORCID

Affiliation:

1. National Scientific Center “Institute of Experimental and Clinical Veterinary Medicine”, Kharkiv, Ukraine

Abstract

Both viruses and bacteria, including Avibacterium paragallinarum, formerly known as Haemophilus paragallinarum, can be etiological agents of respiratory infections of birds. Cultural-morphological and molecular-biological studies established that three isolates selected during 2019–2020 from pathological material (swabs from the subocular sinuses) of 42–180 days old birds (No. 1 — SS 6/20, serotype A; No. 2 — SS 7/20, serotype B; No. 3 — SS 8/20, serotype C) belonged to the species A. раragallinarum and they formed a heterogeneous group. During the study of the virulence of isolates on birds, it was found that it varies: A. paragallinarum SS 6/20 is virulent (the average value of the sum of points is from 0.5 to 0.7); A. paragallinarum SS 7/20 is low virulent (the average value of the sum of points is from 0.2 to 0.3); A. paragallinarum SS 8/20 is virulent (the average value of the sum of points is from 0.8 to 0.9). Also, isolates were heterogeneous in terms of pathogenicity. The pathogen A. paragallinarum, SS 7/20 had the lowest pathogenicity, while when infected with A. paragallinarum isolates, SS 6/20 and A. paragallinarum, SS 8/20, the morbidity of birds was 80–100%

Publisher

Kharkiv Entomological Society

Subject

General Medicine

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