Atypical Actinobacillosis (pyogranulomatous dermatitis / Cutaneous Actinobacillosis) in a Cow, Semnan North East Iran, A Case Report

Document Type : Original Article

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Azad University Road

Abstract

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Actinobacillosis is an infectious disease with a worldwide distribution, caused by Actinobacillus lignieresii, a small Gram-negative rod that inhabits the upper respiratory tract and digestive tract of ruminants. Bovine actinobacillosis a common cause of sporadic infection in cattle, is typically characterized by pyogranulomatous glossitis in tongue of animals (wooden tongue), but involvement of other tissues, generally the skin or lymph nodes, has been regarded as atypical or cutaneous.
The aim of this study was to describe an occurance of granulomatous dermatitis and lymphadenitis affecting a non pregnant Holestine cow in Garmsar in 2019. Multiple, occasionally ulcerated nodules (granulomatous – like mass) was observed on submandibular region. Actinobacillus lignieresii was isolated from samples collected from the affected cow, and characteristic lesions were observed.
Tissue sections stained with hematoxylin and eosin for histologic examination and with Ziehl–Neelsen stains and periodic acid–Schiff (PAS) reaction for the identification of intralesional microorganisms. The histologic lesions were multifocal pyogranulomatous dermatitis, and lymphadenitis, with Splendore–Hoeppli material. Lesions other than ‘wooden ton­gue’ are usually uncommon; however, actinobacillosis should be included as a differential diagnosis for cutaneous diseases.
 

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Journal of Veterinary Laboratory Research
Volume 16, Issue 2 - Serial Number 26
February 2025
Pages 175-181

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