Five years ago, Bill Gates warned that the biggest potential killer the world faced wasn’t war, but a pandemic. The billionaire spent hundreds of millions of dollars to find faster ways to develop vaccines and create disease-tracking systems. He urged world leaders to build national defenses against new infectious diseases.
Looking back, Mr. Gates said, “I wish I had done more to call attention to the danger.” The Microsoft Corp. co-founder is now squaring off against the scenario he sought to forestall.
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