This is part two of a three-part Horizon special series. In this trilogy on the future, Horizon investigates how the shocking thing about life in the 21st century is that the dream of wiping out infectious diseases may never be realized. In fact, despite all the progress of modern medicine, we face the future knowing that science will never defeat viruses and bacteria. They are the dominant species on the planet. New and deadly viruses will continue to emerge in the 21st century, and killer diseases we thought we had defeated will return. .moreless
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