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    Institut ­Pasteur, Senegal

Testing resources for COVID-19 have been particularly scarce in Africa, where a couple of months ago the continent had just two labs—one of which is Sall’s institute—that could do the job. The virologist has been focused on spreading that capacity and creating a more practical way to test. Working with U.K.-based diagnostic company Mologic, Sall’s team is developing a point-of-care device that will offer results in 10 minutes. Tests will cost less than $1 and be manufactured in Senegal.