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Therese Raphael and Sam Fazeli

Omicron Presents a Major Challenge for China

Countries that used so-called killed-virus vaccines may have an even greater need for booster shots. 



Photographer: VCG/Visual China Group

From the moment it became clear we’d have multiple vaccines for SARS-Cov-2, questions about pecking order arose. Which vaccines provided the best protection? The longest lasting? What were the best combinations? What about time between doses?

Now another question is topping the list: What happens to those answers in the face of new variants?