Table 1. Comparison of age, parity, days after parturition, milk yield and somatic cell counts in cows with acute Escherichia coli mastitis between non-survivors and survivors.

	Non-survivors		Survivors
	n	Prior to onset	n	Prior to onset
Age	7	7.2 ± 1.7*	17	4.9 ± 1.7
Parity	7	4.7 ± 1.5*	13	2.9 ± 1.4
Days after parturition	7	138.1 ± 98.2	17	128.4 ± 91.1
Milk yield (l/day)	6	35.1 ± 9.9	13	34.1 ± 5.0
Somatic cell count (×104/ml)	6	14.5 ± 18.2	13	26.6 ± 44.0

Data were expressed as mean ± SD. n: Number of cows. Non-survivors comprised died or euthanized cows, and survivors were defined as survived or recovered cows from acute E. coli mastitis. *Significantly different from that of survivors (P<0.05).