Public health experts predict that another zoonotic pandemic is on the horizon and say it is simply a question of when and where it surfaces. "The continuing effect of the HIV/AIDS pandemic is a reminder of the risk of zoonotic pathogens spreading from their natural reservoirs to man," veterinarian William Karesh wrote in a series of articles in the Lancet focusing on zoonoses. Organizations are working to improve detection of emerging diseases, but there are many challenges, including the increasing risk of transmission as the growing urban population brings people into closer contact with animals.

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