Prognosis
Double-Shot Covid Vaccines Multiply Immunization Challenges
- Moderna, AstraZeneca-Oxford will test two-dose regimens
- Twice the jabs complicates a worldwide immunization effort
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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 to immunize billions of people.
The latest results from front-runners in the sprint to come up with a vaccine, including the University of Oxford-AstraZeneca Plc partnership and Moderna Inc., highlight that prospect. Both efforts are conducting final-stage testing with two doses.