Boris Johnson at a press conference Dec. 8, after discussions on restrictions as a result of the Omicron variant (Adrian Dennis/Pool via AP Images)

Covid-19 roundup: UK preps for a wave of Omi­cron cas­es; Bourla sug­gests a fourth dose might be nec­es­sary

With re­ports of Omi­cron cas­es in over 50 coun­tries, and at least 19 US states, some re­gions like the UK are now ex­pect­ing a rapid …

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