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Abstract

A method for determining a degree of infection comprising the steps of i) preparing an un-isolated sample by adding a differentiating marker, suitably a meta-chromatic stain such as, for example, acridine orange to mammalian milk in an amount sufficient to provide a differentiation between cell types; ii) measuring a differential somatic cell count on the sample by means of a cytometer having a detection system sensitive to differences in the differentiating marker resulting from the marker becoming differently associated with different cell types in the sample; and iii) determining an indication of a degree of infection dependent on the measured differential cell count.

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