Average prevalence of the twenty most prevalent bacterial genera for each different group of samples (1 = healthy quarter, somatic cell count < 20.000; 2 = healthy quarter, somatic cell count ranged from 21,000 to 50,000; 3 = healthy quarter, somatic cell count >50,000; 4 = subclinical culture positive quarters, somatic cell count >400,000; 5 = mastitis quarter culture negative quarters).

<p>Average prevalence of the twenty most prevalent bacterial genera for each different group of samples (1 = healthy quarter, somatic cell count < 20.000; 2 = healthy quarter, somatic cell count ranged from 21,000 to 50,000; 3 = healthy quarter, somatic cell count >50,000; 4 = subclinical culture positive quarters, somatic cell count >400,000; 5 = mastitis quarter culture negative quarters).