One dose of a Covid-19 vaccine given to previously infected people is generating an immune response that might render a second shot unnecessary, potentially freeing up limited vaccine supply for more people, preliminary research suggests.
source https://www.wsj.com/articles/for-covid-19-survivors-one-shot-may-be-enough-preliminary-studies-show-11613903400?mod=pls_whats_news_us_business_f
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