- UK launches ‘world first’ trial mixing different Covid vaccines for first and second dosesCNBC
- UK scientists find new data on efficacy of Oxford-AstraZeneca vaccine | WNTABC News
- New Covid-19 trial tests mixing two different vaccines for first timeNBC News
- With a single number, AstraZeneca study fueled hopes that eclipsed dataSTAT
- After a Rocky Start, Novavax Vaccine Could Be Here by SummerThe New York Times
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