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Online Journal of Veterinary Research

(Including Medical and Laboratory Research)

Established 1994

ISSN 1328-925X

Volume 26 (2):113-123, 2022.

Case study: Unusual cases of actinobacillosis in dairy heifers and cows


Taghipour- Bazargani T 1, Khodakaram- Tafti A2*, Atyabi N 1, Faghanizadeh GH3


1Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Tehran, Tehran,Iran; 2*Department of Pathology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran; 3 Private Veterinarian, Tehran, Iran.



Bazargani T, Tafti KA, Atyabi N, Faghanizadeh GH., Case study: Unusual cases of actinobacillosis in dairy heifers and cows, Onl J Vet Res., 26 (2):113-123, 2022. We report an unusual case of actinobacillosis in four 8-15 month heifers and 2 dairy cows from 190 Holstein cattle with history feeding on oat and wheat straw due to 4 years of drought. In heifers we found cud dropping, drooling, reduced rumination, anorexia, swelling of parotid and pharyngolaryngeal lymph nodes and warts on dorsal surface of tongue 0.5-2 cm, granulomatous abscesses in soft tissues including skin around mandibles. When incised, the tongue revealed multiple large round 1-3cm whitish nodules in pharyngo-laryngeal lymph nodes, salivary glands and tonsils. Histopathologically, pyogranulomatous inflammation and microabscess formation was diagnosed in all affected tissues with ulcerative glossitis beneath mucosa, striated muscles, adipose tissues and salivary gland acini. By bacteriology lesions revealed karyorrexis, degenerated neutrophils, coccobacilli and macrophages with hemosiderin. Gram stain revealed gram negative coccobacilli of Actinobacillus lignieresii. Granulomas had radiating eosinophils reacting to splendore-hoeppli test. Microscopy of lymph nodes, tonsils and salivary glands exhibited suppurative inflammation and microabscesses with characteristic club colonies of actinobacillosis confirmed by Brown-Brenn stain. We found no acid fast organisms in the tissue sections stained by the Ziehl-Neelsen method. We treated animals succesfully with 10mg/kg streptomycin IM twice daily every 12 hrs with 6-10g potassium iodide for 7 days.

Key words: actinobacillosis, Actinobacillus lignieresii, Holstein, heifer, cows.