The prevalence and antimicrobial resistance of mastitis pathogens has been investigated in Argentina in several studies (1, 2, 3). In many countries, the reduction of the national somatic cell count level, has been accompanied by decreased prevalenceof subclinical mastitis and a change in the prevalence of mastitis pathogens. The last surveys in Argentina were carried five years ago. The objective of this study was to determine the actual prevalence of mastitis pathogens and their resistance to selected antimicrobial agents from dairy herds in Argentina
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