Risk factors evaluated in the analysis of canid pathogen exposure in Yellowstone National Park, 1991–2007.

*Age class was used as a factor in the analysis of canine herpesvirus and N. caninum exposure in wolves and coyotes. For all other pathogens, wolf-pup (0.5–0.9 yr) and adult (≥1 yr) and coyote juvenile (0.5–1.5 yrs) and adult (≥1.6 yrs) data were analyzed separately. Note the differences in factors and categories considered in the analysis of wolf and coyote data. Factors considered in the analysis of exposure to a particular pathogen are detailed in the text.