Table 1.

Generalized linear model for effects of primary clonal phenotype, genotype, and dose on infection frequency in primary and secondary exposures in experiment I

Source	df	Wald χ2	P
Primary exposure
Intercept	1	99.341	<0.001
Phenotype	1	113.911	<0.001
Clone (Phenotype)	4	16.953	0.002
Dose	2	50.744	<0.001
Phenotype × Dose	2	58.221	<0.001
Clone (Phenotype) × Dose	8	3.154	0.924
Secondary exposure
Intercept	1	16.821	<0.001
Phenotype	1	3.456	0.063
Clone (Phenotype)	4	14.965	0.005
Dose	2	13.987	0.001
Phenotype × Dose	2	0.640	0.726
Clone (Phenotype) × Dose	8	16.840	0.032