This image illustrates the specific morphological characteristics of three different organisms grown on MacConkey Agar. Top: Escherichia coli, Bottom left: Proteus vulgaris, Bottom right ...

Mastitis is the most frequent infectious disease that causes the greatest losses for dairy cattle (Langoni et al. 1998, Costa et al. 1999) and may be subclinically or clinically (Munoz et al. 2006).