Vaccination

France's Sanofi halts work on mRNA Covid vaccine

French pharmaceutical giant Sanofi said Tuesday it was stopping work on an mRNA vaccine against COVID-19 despite positive test results as it lags behind rivals on producing a coronavirus shot.

Vaccination

US booster shots start, even as millions remain unprotected

The U.S. launched a campaign to offer boosters of Pfizer's COVID-19 vaccine to millions of Americans on Friday even as federal health officials stressed the real problem remains getting first shots to the unvaccinated.

Vaccination

CDC advisers try to work out the details on booster shots

With booster doses of Pfizer's COVID-19 vaccine now authorized in the U.S., government advisers reconvened on Thursday to tackle the most contentious question yet: Exactly who should roll up their sleeves right away?

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