Double-Shot Covid Vaccines Multiply Immunization Challenges
Vaccine research work at the Torlak Institute of Virology in Belgrade, Serbia. (Photographer: Oliver Bunic/Bloomberg)

Double-Shot Covid Vaccines Multiply Immunization Challenges

(Bloomberg) -- When it comes to protecting the world from the coronavirus, two doses of a vaccine may be better than one. But doubling the number of jabs each person needs could complicate efforts ...
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