Table 3.

Transmission rate (β) with 95% confidence interval (CI) estimated using the generalized linear model with covariates (strain, group, environment)

Variables	β	95% CI	P value
Baseline*	0·038	0·0133–0·09
Strain
St2	1·69	0·65–4·37	0·27
St1	—	—
Group
G2	1·56	0·58–4·61	0·4
G1	—	—
E†	1·5	1·19–1·9	0·0006

^*Corresponds to estimate for St1 in group 1 at log₁₀ (env) = 0.

^†ECO157 load in the environment during the preceding sampling time (i.e. 2 days prior) in log₁₀ scale.