A drug used to treat rheumatoid arthritis has been found to improve survival of hospitalized Covid-19 patients. The discovery comes from a study of over 1,500 Covid-19 patients in 12 countries and is being hailed as a significant breakthrough for treatment options for people who are severely ill with Covid-19. Early on in the pandemic in February 2020, baricitinib was identified as a promising drug to treat Covid-19 by a company using artificial intelligence (AI) and machine learning to identify potential treatments for diseases. The drug, normally used to treat rheumatoid arthritis, was thought to have possible antivirus properties, but...