The frequency and etiological profile of clinical mastitis (CM) may differ considerably between dairy herds from different countries and even between herds within a given country (Olde Riekerink et al, 2008). Therefore, descriptive results of epidemiological studies characterizing CM can provide information that can be used as a basis for development of targeted strategies of control and prevention. Although several studies have reported the association between pathogen and CM, few have prospectively monitored the frequency and etiology of CM on farms for an extended time. The objective of this study is to describe pathogen distribution and incidence risk of CM in 8 large New York dairy herds during 1 year.
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