In an epidemiological survey of Spain's Dońana National Park, the findings of which are published on July 23 in the journal PLoS ONE, Christian Gortázar and colleagues studied the prevalence of bovine tuberculosis (bovine TB) infection among populations of wild boar, red deer and fallow deer in the national park, which is located in southern Spain. The researchers suggest that the results can be used to investigate bovine TB transmission dynamics between and within each species and to extrapolate the implications for spill-over to domestic cattle and wildlife management policies.