A booster shot of the COVID-19 vaccine made by Pfizer and BioNTech strongly extends protection, a new study shows. The latest COVID updates.
Author: Elinor Aspegren, Ryan W. Miller and Grace Hauck, USA TODAY
California releases ethnic data on vaccines; CDC releases school reopening ‘roadmap.’ Latest COVID-19 updates
The US is reporting more variant cases. Officials considered using ventilator for Trump during COVID-19 bout, reports say. Latest COVID-19 news.