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 1

Tests of the effects into the model for transformed CFU.

Effect	Numerator df	Denominator df	-value	Pr <
Dose	2	36.4	57.63	<0.0001
Anti--intimin C280; antibody (dose)	2	33.5	8.58	0.0010
Anti-EspB; antibody (dose)	2	35.4	0.72	0.4944
Day × dose	2	40.4	16.77	<0.0001