As with earthquakes, we can do much to reduce the chances of people being hurt by emerging infectious diseases. We know where new diseases are most likely to occur. We need to invest more effort in developing countries, especially those that are rapidly changing.
The world is ever smaller. Flu strains incubating in China can be in New York or LA or DC in the span of a day. This is a world in which an incurable bacterial disease, spread by a tiny insect native to Asia, decimates the citrus crop in Florida.