Covid-19 vaccine: What kind of vaccines are there and how is mRNA tech ahead? | Oneindia News

At least 8 vaccines for Covid-19 are in the clinical trial stage and over a 100 are in the pre-clinical stage and race to develop a vaccine is picking up pace with the US bio-tech firm Moderna leading. We take a look at the various ways in which vaccines ar emade and why they take so long to develope. Also, how did Moderna manage to get ahead?