Could it soon be over? Covid-19 vaccine trials raise hopes for end of pandemic

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This week has seen a second global sigh of relief with news of not just one Covid-19 vaccine, but two. As trials from Moderna show their vaccine is nearly 95 percent effective, some one billion people could be immunised against coronavirus by the end of 2021. But which billion people? Who will get the vaccine first? Who might miss out? And with an American company and a German-American firm leading the way, how might the vaccination programme be politicised? We discuss the geopolitics of the vaccine: will the rollout be unequal?