Abstract

CANTON, Germán et al. Mycoplasma bovis-pneumonia and polyarthritis in feedlot calves in Argentina: First local isolation. Rev. argent. microbiol. [online]. 2022, vol.54, n.4, pp.41-50.  Epub Dec 01, 2022. ISSN 0325-7541.  http://dx.doi.org/10.1016/j.ram.2022.02.005.

Bovine respiratory disease (BRD) is one of the most frequent clinical concerns inweaned calves after their arrival at the feedlot. This work reports the first local isolation ofMycoplasma bovis from feedlot calves with pneumonia and polyarthritis in Argentina. Twentyfour out of 545 calves showed progressive, subacute to chronic respiratory distress, coughing,and fever. Thirty percent of the affected calves also showed lameness and swelling of elbowor carpal, and knee or tarsal joints. Five necropsies were performed and severe multifocal tocoalescent pulmonary nodules, containing white-yellowish caseous exudate encircled by fibroustissue, and fibrinonecrotic arthritis and tenosynovitis were detected. Mycoplasma was isolatedfrom lung and joint samples. The 16S-23S rRNA ITS consensus sequence obtained from theseisolates showed 100% similarity with the same region of M. bovis strains. Since there are no com-mercially available vaccines in the region for the prevention and control of M. bovis pneumoniaand arthritis, surveillance is a priority to reduce the source of disease to naïve animals.

Keywords : Mycoplasma bovis; Pneumonia; Polyarthritis; Feedlot; Cattle.

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