簡單說，這是個流程，疫苗還沒研究出來，如何做1，2，3期。WSJ所可笑家正在adapt。沒有進入臨床三期。所以，你想多了。

Covid-19 Vaccines Can Be Updated for the Delta Variant. Here’s How.

Scientists are working to adapt the mRNA platform underlying some vaccines to target specific strains of the virus