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Pfizer COVID-19 shot expanded to US children as young as 12

COVID-19 vaccines finally are headed for more kids as U.S. regulators on Monday expanded use of Pfizer's shot to those as young as 12, sparking a race to protect middle and high school students before...

Mild to severe: Immune system holds clues to virus reaction

One of COVID-19's scariest mysteries is why some people are mildly ill or have no symptoms and others rapidly die — and scientists are starting to unravel why. An international team ...