LONG BEFORE THE CORONAVIRUS BEGAN TO spread beyond China, infectious disease experts around the world knew there was ample reason to fear it. Not only was the pathogen highly contagious and lethal, it was also new-scientists had written no medical papers on it, doctors had no vaccines or pills to give their patients. The most effective tools we have, at the moment, are public health measures out of the 19th century such as quarantines and social distancing.
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