Europe Steps Up Curbs; U.K. Widens Booster Program: Virus Update.

The U.K. expanded its vaccine booster program, making shots available to people in their 40s, and a study of immune responses to four Covid vaccines found that Pfizer's shot yielded the strongest result. U.K. Offers Boosters to People in Their 40s (5:30 p.m. HK) The U.K. is expanding its Covid-19 booster program to younger people as the country seeks to head off another wave of infections this winter. [Extracted from the article]

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