CNNのインスタグラム(cnn) - 1月12日 09時02分

As of January 11, at least 50 countries are rolling out Covid-19 vaccines (shown above in blue). An estimated 70-90% of the world's 7.8 billion people would need to receive the vaccine before achieving the so-called "herd immunity" required for people to return to normal life, Dr. Anthony Fauci has said. Most of the vaccines require two doses per person, which means distributing roughly 10 to 14 billion doses — a logistical challenge the likes of which the world has never seen.

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