The United States is preparing for the possible need to update its Covid-19 vaccines.
The US Food and Drug Administration's independent Vaccines and Related Biological Products Advisory Committee is set to meet Tuesday to discuss whether the composition of Covid-19 vaccines should be modified to target a specific coronavirus strain, and if so, which strain should be selected.That means the Covid-19 vaccinations that people receive in the future could be somewhat or completely different formulations than what are administered now.
At the moment, vaccine-induced protection against Covid-19 seems to not stay durable for as long as vaccine experts would hope, but it is not so clear why. Waning protection could be due to the vaccines themselves or due to the emergence of coronavirus variants evading the vaccines.
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