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Important preventive measures carried out in the herds of domestic animals have found improving the health status of farms, particularly for contagious diseases subject to mandatory declaration and accompanying drastic but necessary eradication measures in infected flocks. However it is more difficult to apply these same biosecurity measures on wildlife that may have been contaminated or not by domestic animals. The growing number of emerging infectious diseases of wildlife may reflect increased vigilance, but most often the result of a change in the ecology of the host, the causative agent or both. So, wildlife may be reservoirs of pathogens that can infect domestic herds again but mostly for the majority of them contaminating humans. This is the case, for example, of West Nile virus (WNV), avian influenza virus, rabies virus, Nipah virus, diseases transmitted by ticks, tuberculosis, brucellosis, hepatitis E or some parasitic zoonoses.