The Observer: Scientists say clinical trials for ‘variant-proof’ vaccines could start very soon By The Observer. Published Feb. 21, 2021. Updated Feb. 21 at 6:20 pm This handout illustration image obtained Feb. 27, 2020 courtesy of the US Food and Drug Administration shows the coronavirus, COVID-19. Photo by AFP Scientists are developing a range of second-generation Covid vaccines aimed at expanding protection against the disease. Read more here.