The quest for longer-lasting Covid-19 vaccines - CNN
5/20/2022 12:00:00 AM2 years 11 months ago
by Brenda Goodman, Jacqueline Howard and Michael Nedelman, CNN
by Brenda Goodman, Jacqueline Howard and Michael Nedelman, CNN
As waves of new coronavirus variants circulate the globe, one thing has become clear: human immunity against the virus fades over time.
By Brenda Goodman, Jacqueline Howard and Michael Nedelman, CNN Updated 6:18 AM ET, Fri May 20, 2022 (CNN)As waves of new coronavirus variants circulate the globe, one thing has become clear: human… [+20859 chars]
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