(a) Per cent of raccoons (n = 193), subdivided by age class, who were seropositive for zero (23.3% of animals across all years), one (42.0%) or two (34.7%) viruses (CDV and FPV). (b) Mean number of IgG+ seroconversions for raccoons, subdivided by age class and year of capture. (a) Open bar, zero virus; grey bar, one virus; black bar, two viruses.