Prognosis
Mixing Covid Vaccines Is Effective in Study on Pfizer, Astra
- Moderna, Novavax shots tested after one dose of Astra, Pfizer
- Study shows vaccines can be mixed without lowering protection
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Mixing other vaccines with those from AstraZeneca Plc or Pfizer Inc. offers at least as effective protection against Covid-19 as giving two doses of the same shots, a U.K. study found.
The University of Oxford study, published Monday in the Lancet medical journal, tested vaccine combinations on more than 1,000 volunteers over 50. Some were immunized with a second dose from Moderna Inc. or Novavax Inc. nine weeks after having received a first shot of AstraZeneca or Pfizer.