South Korea has announced that it will begin a clinical trial into mixing doses of AstraZeneca and Pfizer Covid-19 vaccines to speed up inoculation campaigns amid delays caused by production issues and safety fears.
The new trial will include 500 military personnel who have received one dose of the AstraZeneca vaccine, examining their immune response after being given a second dose of the Pfizer jab. A timeline for the study has not been outlined but the selection of participants is expected to be diverse, according to a South Korean health official.
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