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They are a result of things people do to nature. Disease, it turns out, is largely an environmental issue. Sixty percent of emerging infectious diseases that affect humans are zoonotic â they originate in animals. And more than two-thirds of those originate in wildlife.
Ghosts of epidemics past. October 2008. Diseases that pose global health threats â like HIV, malaria, and tuberculosis â regularly make the news. Last month, for example, saw reports that HIV infection rates in the US are up, that malaria statistics worldwide are down, and that the distribution of medicines to treat the three diseases had improved.