FDA advisers favor retiring original covid shot in favor of newer version

Advisers to the Food and Drug Administration on Thursday unanimously endorsed retiring the original coronavirus shot in favor of one that targets both the original strain of the coronavirus and the omicron variant. 6park.com
注意下面这段
Representatives from three vaccine companies - Moderna, Novavax and Pfizer - indicated they would need advance notice of 100 days to six months to launch a vaccine based on a new variant. 6park.com
100天恰好是三个月。中国、美国同时开始开发疫苗，基于中国公布的original coronavirus。英国9月份发现了alpha variant，但推迟了3个月通报。结果我们看到美、欧接种的mRNA疫苗在alpha流行时，保护力好于中国的疫苗，到了Delta，omicron时，就和中国的疫苗保护力一样了。