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    South Africa halts AstraZeneca immunization after shots fall flat against new variation

    South Africa halted Monday’s planned rollout of AstraZeneca’s COVID-19 vaccinations after data showed that it gave minimal protection against moderate infection from one variant, stoking fears of a much longer cat-and-mouse battle with the pathogen. The coronavirus has killed 2.3 million people and turned regular life upside down for countless but new versions have raised