(Click on the table to enlarge it). | Some are highly contagious and affect numerous countries such as peste des petits ruminants, sheep pox, and goat pox. Their spread is determined by the mobility of animals in extensive livestock systems, particularly in the Sahel, and by the legal and illegal trade movement of animals to meat-consuming countries. Other diseases, such as heartwater, bluetongue and Rift Valley fever, are related to the environmental conditions governing the transmission of pathogens by vectors (ticks or insects). Certain diseases, such as brucellosis, Rift Valley fever, hydatidosis, are also zoonoses, common to both humans and animals.
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