Table 3.

Absolute (AF) and relative (RF) frequency distribution according to udder status of observations (n = 20,519)

Pathogen	Status a	AF	RF
CNS	0	12,568	0.61
	1	7951	0.39
STHAU	0	19,579	0.95
	1	940	0.05
STR	0	19,978	0.97
	1	541	0.03
ALL	0	13,246	0.62
	1	8019	0.38

CNS coagulase-negative staphylococci, STHAU Staphylococcus aureus, STR streptococci, ALL observed bacteriological colonies as described in M&M section

^a Udder status as binary record: 0 = not infected, 1 = infected