Moderna said on Monday its Covid-19 vaccine was 94.5% effective in a preliminary analysis of a large late-stage clinical trial, another sign that a fast-paced hunt by scientists and pharmaceutical companies is paying off with potent new tools that could help control a worsening pandemic.

The highly positive readout comes just a week after a similar shot developed by Pfizer and BioNTech was found to be more than 90% effective in an interim analysis. Both shots rely on a technology called messenger RNA that has never been used to build an approved vaccine. Soon, millions of people about the world could be spared from illness by the breakthroughs...

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