Pfizer and BioNTech data analysis: COVID vaccine 'strongly effective'

The Covid-19 vaccine from Pfizer and BioNTech is strongly effective, according to an early analysis of data from their large Phase 3 trial.

Volunteers who took the two injections three weeks apart experienced more than 90% fewer cases of symptomatic Covid-19 than those who received a placebo, according to the analysis.

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