(Reuters) - Pfizer Inc said on Tuesday it will start a large study to test its COVID-19 vaccine in children below 12 and selected a dosing regime for the trial.
In December, British researchers discovered that a new variant was sweeping through their country. When it arrived in other countries, the variant, now known as Alpha, tended to become more common in its new homes as well. By April, it had become the dominant variant in the United States, and it has remained so ever since.
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