Abstract
ABSTRACT Mastitis is considered the main disease that affects dairy cattle worldwide, and it is caused mainly by Staphylococcus aureus and environmental Streptococcus spp. Eventually, nonconventional pathogens, as rapidly growing mycobacteria(RGM), may also cause chronic mastitis, which will not be responsive to antibiotic treatments. Diagnosis of mastitis caused by RGM is a difficult task, and most of time this agent may be misdiagnosed. Here we describe a case of clinical mastitis caused by the RGM Mycobacteroides abscessus in a cow from Southern Brazil, confirmed by microbiological and molecular characterization. Our results reinforce the necessity of a detailed laboratorial identification of the agent and to include this agent in differential diagnosis of chronical clinical mastitis nonresponsive to treatment.
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