Tiny biotech company Sorrento Therapeutics (SRNE) claimed Friday its experimental coronavirus treatment is a cure for Covid-19. Meanwhile, another company said it gained authorization for a coronavirus test. In preclinical testing, Sorrento's antibody drug provided "100% inhibition" of SARS-CoV-2 — the new coronavirus that causes Covid-19 — within four days. Sorrento expects this antibody to be the first in a drug cocktail that would create a "protective shield" against infection. "Our STI-1499 antibody shows exceptional therapeutic potential and could potentially save lives following receipt of necessary approvals," Chief Executive Henry Ji said in a written statement. "We at Sorrento are...