There have been numerous improvements, summarized here: https://www.reuters.com/article/us-health-coronavirus-lessons-factbox-idUSKBN23Z04K https://www.reuters.

There have been numerous improvements, summarized here: https://www.reuters.com/article/us-health-coronavirus-lessons-factbox-idUSKBN23Z04K https://www.reuters.com/article/us-health-coronavirus-lesson... * Some medication which appears to be effective, i.e. dexamethasone and remdesivir * Proning * An increased focus on avoiding blood clots, e.g. by using blood thinners.