Table 1.

Proportion of polymorphonuclear cells (PMN) lymphocytes (Lym) and macrophages (Mac) observed in different studies, under different definitions of udder health statuses and using different methods of determination of these proportions.

References	Definition	Method	PMN	Lym	Mac
(4)	Healthy: no pathogen and SCC <10,000 cells/ml	Cytology—Microscopy	10	67	23
	1 day post-inoculation with Staphylococcus aureus	Cytology—Microscopy	51	28	21
	4–8 days post-inoculation with Staphylococcus aureus	Cytology—Microscopy	39	38	24
	9–14 days post-inoculation with Staphylococcus aureus	Cytology—Microscopy	32	43	26
	Healthy: no pathogen and SCC <10,000 cells/ml	Flow cytometry	18	72	10
	1 day post-inoculation with Staphylococcus aureus	Flow cytometry	61	18	20
	4–8 days post-inoculation with Staphylococcus aureus	Flow cytometry	46	25	29
	9–14 days post-inoculation with Staphylococcus aureus	Flow cytometry	31	34	34
(5)a	Healthy: SCC <100,000 cells/ml	Flow cytometry	28	11	13
	Acute E. coli	Flow cytometry	38	1	4
	Acute Staphylococcus aureus	Flow cytometry	36	5	11
	Chronic Staphylococcus aureus	Flow cytometry	42	37	17
	Chronic non-aureus Staphylococci	Flow cytometry	49	18	13
	Chronic Streptococcus dysgalactiae	Flow cytometry	73	8	5
(6)	SCC <50,000 cells/ml	Flow cytometry	31	26	43
	SCC between 50,000 and 100,000 cells/ml	Flow cytometry	51	14	35
	SCC between 100,000 and 200,000 cells/ml	Flow cytometry	59	12	29
	SCC between 200,000 and 400,000 cells/ml	Flow cytometry	64	11	25
	SCC >400,000 cells/ml	Flow cytometry	67	9	24
(7)	SCC <6,250 cells/ml	Flow cytometry	15	63	22
	SCC between 6,250 and 25,000 cells/ml	Flow cytometry	17	59	24
	SCC between 25,000 and 100,000 cells/ml	Flow cytometry	23	50	27
	SCC >100,000 cells/ml	Flow cytometry	60	19	21
(8)	SCC <6,250 cells/ml	Cytology—Microscopy	12	56	32
	SCC between 6,250 and 25,000 cells/ml	Cytology—Microscopy	12	49	38
	SCC between 25,000 and 100,000 cells/ml	Cytology—Microscopy	52	31	17
	SCC >100,000 cells/ml	Cytology—Microscopy	78	12	10
(9)	Healthy: No pathogen and SCC <100,000 cells/ml	Cytology—Microscopy	43	34	23
	Culture positive and SCC <100,000 cells/ml	Cytology—Microscopy	56	23	21
	Culture negative and SCC >100,000 cells/ml	Cytology—Microscopy	63	16	21
	Culture positive and SCC >100,000 cells/ml	Cytology—Microscopy	68	12	20
(10)a	Healthy: no pathogen and SCC <200,000 cells/ml	Flow cytometry	28	58	9
	Moderate mastitis but SCC <100,000 cells/ml	Cytology—Microscopy	47	20	33
	Moderate mastitis and SCC between 100,000 and 400,000 cells/ml	Cytology—Microscopy	59	10	31
	Severe mastitis but SCC <100,000 cells/ml	Cytology—Microscopy	59	18	23
	Severe mastitis and SCC between 100,000 and 400,000 cells/ml	Cytology—Microscopy	71	9	20
	Severe mastitis and SCC >400,000 cells/ml	Cytology—Microscopy	82	5	13
(11)	Healthy: low SCC and no pathogen	Flow cytometry	43	30	27
(12)	Healthy: SCC <100,000 cells/ml	Flow cytometry	32	16	52
	SCC >800,000 cells/ml	Flow cytometry	49	18	33
(13)	Healthy: no pathogen and SCC <100,000 cells/ml	Flow cytometry	20	8	72
	Infused with endotoxin	Flow cytometry	78	2	19
(14)	Healthy: no pathogen and SCC <100,000 cells/ml	Cytology—Microscopy	28	25	47

^aLeucocyte proportions do not necessarily add to 1 because of measuring other cells in the original studies. The numbers were obtained from (6).