Characterization of Staphylococcus spp. strains in milk from buffaloes with mastitis in Brazil: the need to identify to species level to avoid misidentification.

ABSTRACT - Mastitis is an inflammation of the mammary gland that affects dairy cattle worldwide causing economic losses. Coagulase-negative staphylococci (CNS) are the predominant cause of this type of infection. We have recently showed that coagulase-positive staphylococci could be misidentified. So, the aim of this study was to characterize the Staphylococcus spp. strains initially classified as coagulase-negative Staphylococci, isolated from buffalo with subclinical mastitis. Milk of buffaloes with mastitis in herds was collected and 9 strains were identified as CNS by phenotypic tests. Molecular methodologies latter identified the strains as coagulase-negative Staphylococcus chromogenes (5), coagulase-positive Staphylococcus hyicus (2) and coagulase-positive Staphylococcus aureus (2). Our results strongly support the need to identify the isolates to a species level in order to avoid misidentification and to be aware of the classification using the coagulase test alone. RESUMO - A mastite é uma inflamação da glândula mamária que afeta o gado leiteiro em todo o mundo, causando perdas econômicas. Staphylococcus coagulase-negativa (SCN) são a causa predominante desse tipo de infecção. Mostrou-se recentemente que Staphylococcus coagulase-positiva podem ser identificados erroneamente. Assim, o objetivo deste estudo foi caracterizar cepas de Staphylococcus spp. inicialmente classificados como Staphylococcus coagulase-negativa, isolados de búfalas com mastite subclínica. O leite de búfalas com mastite foi coletado, e nove cepas foram identificadas como SCN por testes fenotípicos. Metodologias moleculares identificaram as cepas como Staphylococcus chromogenes coagulase-negativa (5) Staphylococcus hyicus coagulase-positiva (2) e Staphylococcus aureus coagulase-positiva (2). Os resultados reforçam a necessidade de identificar as cepas em termos de espécie, a fim de se evitarem erros de identificação e estar atento à classificação utilizando o teste de coagulase sozinho.

Bibliographic Details

Main Authors:	COIMBRA E SOUZA, V., BRITO, M. A. V. P. e, CHAMON, R. C., LAPORT, M. S., GIAMBIAGI DE MARVAL, M.
Other Authors:	UFRRJ; MARIA APARECIDA V PAIVA E BRITO, CNPGL; UFRRJ; UFRRJ; UFRRJ.
Format:	Artigo de periódico biblioteca
Language:	Ingles English
Published:	2017-12-22
Subjects:	Buffalo, Coagulase test, Staphylococcus, mastitis, milk,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1083432 https://doi.org/10.1590/1678-4162-9351
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