The organization declared Covid a pandemic on March 11, 2020.
An all-star panel of scientists concluded governments should focus on immunizing the unvaccinated.
The vaccine stopped an average of 70% of participants from falling ill.
Purchase agreements with the U.S. call for 100 million doses, with an option to increase the number to 500 million.
Workers soothe fears, then painstakingly retrace daily lives.
New York City has suffered the most, with more than 16,000 deaths.
From Macau to the Alps, hotels are emptying as the outbreak spreads.
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