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There are at least 39 important diseases people catch directly from animals. There are at least 48 important diseases people get from the bite of bugs that bit an infected animal. And there are at least 42 important diseases that people get by ingesting or handling food or water contaminated with animal feces. Some are as old as memory: rabies, bubonic plague, food poisoning. Others have only recently emerged: monkeypox, West Nile encephalitis, Legionnaires' disease. And some, such as highly lethal bird flu, we fear even though they haven't -- yet -- spread in humans.