Amid hopeful signs that maybe — just maybe — the pandemic has peaked here with the help of vaccines, a depressing number of people, mainly in poorer countries, still have yet to receive a single shot. With an unpredictable virus and its variants that show little respect for international borders, that shortfall could come back to haunt more fortunate countries like the United States. Fortunately, a historic mobilization of public and private sector actors and actions has led to 4.9 billion people around the world having received at least one shot, according to the World Health Organization. Bu…

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