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+--- Thread: US authorises fourth coronavirus shot for over 50s as BA.2 subvariant spreads (/Thread-US-authorises-fourth-coronavirus-shot-for-over-50s-as-BA-2-subvariant-spreads)
US authorises fourth coronavirus shot for over 50s as BA.2 subvariant spreads - theold - 31-03-2022
The Food and Drug Administration says the decision is based on emerging evidence that an additional booster improves protection against severe Covid-19
An Israeli study shows that three doses of current generation mRNA vaccines have hit a ceiling in terms of the immune response generated
https://www.scmp.com/news/world/united-states-canada/article/3172323/us-authorises-fourth-coronavirus-shot-over-50s-ba2