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Mixing Astra and Pfizer Shots Creates Strong Immune Response

  • Vaccine ‘mix and match’ could alleviate supply scarcity
  • Effectiveness of combination depends on the order of shots
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Mixing doses of Covid-19 vaccines from Pfizer Inc. and AstraZeneca Plc creates a strong immune response, according to results from a University of Oxford study, a finding that could enable greater flexibility in the use of scarce supplies.