FOSTER CITY, CALIFORNIA - APRIL 29: A sign is posted in front of the Gilead Sciences headquarters on April 29, 2020 in Foster City, California. Gilead Sciences announced preliminary results of a drug trial with that showed at least 50% of patients with coronavirus that treated with a five-day dosage of remdesivir improved and more than half were released from the hospital within two weeks. (Photo by Justin Sullivan/Getty Images)