Stanford University published an article 2 months ago. It was related to the fact that the chloroquine substance used in the treatment of malaria could also be effective in the treatment of COVID-19. However, this article was later closed to access. Then there were reports that the chloroquine substance did not work. Today there are various approaches to testing whether available vaccines will work in the world. But how long this process will take is a matter of curiosity. Apart from the production of the vaccine, this actually has other difficulties. I follow Ercüment Ovalı's work on Twitter these days. He is also working on developing existing vaccines. I wonder which lab will develop the most effective method.