CNN: 二阶 Covid-19 疫苗可增强保护作用，但针对 奥秘克绒 BA.4 和 BA.5，并不优于疫苗原始配方
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Updated Covid-19 vaccines boost protection, but may not beat original formula against BA.4 and BA.5, early studies suggest | CNN
The updated Covid-19 booster shots appear to work about as well against the BA.4 and BA.5 Omicron subvariants as the original boosters they replaced, according to two new studies from research teams at Harvard and Columbia universities.
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