This outbreak, the first in a decade of the less common Sudan strain, is a chance for clinical trials of the three vaccines donated by the U.S.-based Sabin Vaccine Institute, University of Oxford and Merck.
According to government data, the country reports roughly 1,200 Covid cases every week. Over 2.2 billion Covid vaccine doses have been administered so far.
...In particular, researchers think sprays or drops given through the nose or mouth could do a better job of stopping transmission. They also hope that vaccines that target multiple parts of the virus or several variants at once could reduce the need for continuous boosters.
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