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Contagious and concerning: What we know about Covid-19 variants

Fast-spreading coronavirus variants have ignited global concern over whether existing vaccines will be able to protect the world from a virus that is constantly...

Killer T cells boost immunity to coronavirus variants: study

The emergence of coronavirus variants has provoked concern about their impact on the effectiveness of vaccines, and whether people who were previously infected might...

Variants raise Covid-19 questions, concern

Several coronavirus variants with the potential to be more transmissible have caused global concern over whether existing vaccines will still protect the world from...

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