Shouldnt this be quite obvious by nw? The 2 doses of the vax protects one from the original covid. Now that covid mutate again, isnt it quite common sense that high chance the original 2 doses will not be effective? Thats y we have the 3rd dose, to increase efficiency
Pfizer slid in premarket trading as Oxford study found two vaccine doses wouldn’t protect from Omicron infection<blockquote>牛津研究发现两剂疫苗无法预防奥密克戎病毒感染,辉瑞在盘前交易中下跌</blockquote>