Moderna, whose coronavirus vaccine appears to be the world’s best defense against Covid-19, has been supplying its shots almost exclusively to wealthy nations, keeping poorer countries waiting and earning billions in profit.
After developing a breakthrough vaccine with the financial and scientific support of the US government, Moderna has shipped a greater share of its doses to wealthy countries than any other vaccine manufacturer, according to Airfinity, a data firm that tracks vaccine shipments.
About one million doses of Moderna’s vaccine have gone to countries that the World Bank classifies as low income. By contrast, 8.4 million Pfizer doses and

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