The pressure is on for countries to vaccinate people against the new coronavirus disease, COVID-19: close to fifty million doses have been administered in the month since the first vaccines were approved for use. But with a global population of nearly eight billion, that’s only a small first step. Even in countries that have stocks of the vaccine, the rollout has been laggard; it is yet to begin in many others. It could take years for most of the world’s population to be immunized, especially as new strains of the virus present greater challenges.
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