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(FILES) This file photograph taken on February 17, 2015, shows the logo of Swiss pharmaceutical giant Roche at its headquarters in Basel. - Swiss pharma giant Roche announced March 23, 2021, "positive" results from clinical trials of an anti-Covid cocktail developed with US biotech firm Regeneron. The results of the Phase 3 trial, "shows investigational antibody cocktail casirivimab and imdevimab reduced hospitalisation or death by 70 percent in non-hospitalised patients with COVID-19," it said in a statement. The cocktail also "significantly shortened the duration of symptoms by four days." (Photo by SEBASTIEN BOZON / AFP) (KEYSTONE/AFP/SEBASTIEN BOZON)