Risk of breakthrough infections remains very rare, three studies find
NBC News reports: The Covid-19 vaccines continue to offer strong protection against severe illness and hospitalization, according to research on more than 1 million people published Wednesday in The Lancet Infectious Diseases. The findings come as the United States prepares to begin offering booster shots to all Americans later this month — a decision driven in part by data federal officials have said indicates the vaccines’ ability to curb infections may be waning. But protection against the most severe forms…