The impact of extrinsic or intrinsic host factors associated with supershedding in avian-virus systems for which data were available (test statistics are shown for the whole model, and odds ratios with 95% confidence intervals, (CI) are shown only for selected factors (statistically significant fac

Notes:
*, Normally fed versus food-restricted mallards (10 & 20% body condition reduction, [31], χ2 = 3.12, df = 1, P = 0.077.
†, House sparrow.
‡, Not estimable because the denominator was zero (i.e., no control treated birds were supershedders).