Ramaswami: While the rush for a vaccine against COVID-19 is on, new candidate vaccines are continuing to enter the initial human trial phase. The one developed by a Beijing-based Biotech company, Sinovac Biotech, is reported to have been used on Rhesus Macaque monkeys, apparently protecting them from the novel coronavirus causing COVID-19. The candidate vaccine has also been tried on humans since April 16 and is in phase I of the clinical trial.