Impact of Infection Dose and Previous Serum Antibodies against the Locus of Enterocyte Effacement Proteins on Escherichia coli O157:H7 Shedding in Calves following Experimental Infection

Table 2

Test of hypotheses on differences of areas under the curve for different doses and at different days.

Null hypothesis	Covariate level of antibody considered	Day	Result of the estimate	value
AUC 1 = AUC 2	No	14	AUC 1 < AUC 2	0.0069
AUC 1 = AUC 2	Yes	14	AUC 1 < AUC 2	0.0056
AUC 1 = AUC 2	No	28	AUC 1 < AUC 2	0.0209
AUC 1 = AUC 2	Yes	28	AUC 1 < AUC 2	0.0185