ABSTRACT - David M Lodge Op-Ed article says US government must develop and coordinate program to protect human health, crops, wildlife and natural ecosystems from alien animals and plants; drawing (M) The recent arrivals in North America of SARS and monkeypox have understandably alarmed us all. But they should not have surprised us. We already knew that an inevitable side effect of globalization is that emerging infectious diseases can spread more rapidly. We already knew that many human diseases have their origin in close contact between people and domesticated animals. Those considerations have informed public health policy for decades.

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