Christos Kyratsous, the top Covid-19 drug hunter at Regeneron Pharmaceuticals Inc., likes to go fast. He drives a Porsche 911, but lately he has been riding his pricey Swiss-made racing bicycle to his office north of New York City.

Velocity became more important than ever this year for the 39-year-old Greek scientist. He is helming a team of Regeneron scientists sprinting to develop the first drug specifically designed to treat Covid-19 and temporarily protect against new infections.

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