(CNN) Ian Haydon helped test Moderna's coronavirus vaccine last year. Although initial evidence suggests immunity from vaccination against coronavirus provides long-lasting protection, vaccine makers have begun making and testing versions of their vaccines that protect against worrying variants of the virus. While the coronavirus vaccines are of course new -- the virus has only been around since the end of 2019 -- the mRNA technology has been studied for many years and used to make vaccines against influenza, Ebola and Zika virus. Several studies have indicated this with coronavirus vaccine. The vaccine-induced immune response was stronger and less variable than the immune response that follows a natural infection, they found.

Source: CNN April 04, 2021 15:45 UTC