FILE PHOTO: Employee Philipp Hoffmann, of German biopharmaceutical company CureVac, demonstrates research workflow on a vaccine for the coronavirus (COVID-19) disease at a laboratory in Tuebingen

FILE PHOTO: An employee of German biopharmaceutical company CureVac, demonstrates research on a vaccine for the coronavirus (COVID-19) disease at a laboratory in Tuebingen, Germany, March 12, 2020. REUTERS/Andreas Gebert/File Photo

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