AS countries around the world grapple with the constrained supply of vaccines for Covid-19, the possibility of getting people vaccinated more quickly if vaccines can be mixed and matched has been raised.
In fact, in the United Kingdom, a controversial trial to mix and match the first and second doses of different vaccines with the Moderna and Novavax shots is currently underway in an attempt to find out if such a strategy might offer better and longer-lasting immunity against the virus and its new variants, and also allow more flexibility in the rollout.
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