Pfizer's early data shows Covid-19 vaccine is more than 90% effective

Experts caution against hyping early results

The drug maker Pfizer announced on Monday that an early analysis of its coronavirus vaccine trial suggested the vaccine was robustly effective in preventing Covid-19, a promising development as the world has waited anxiously for any positive news about a pandemic that has killed more than 1.2 million people.
 
Pfizer, which developed the vaccine with the German drugmaker BioNTech, released only sparse details from its clinical trial, based on the first formal review of the data by an outside panel of experts.
 
The company said that the analysis found that the vaccine was more than 90 percent effective