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The world now seems likely to have at least two effective vaccines against COVID-19 with Monday’s announcement of positive early data from Moderna Therapeutics Inc.’s 30,000-person clinical trial.

The result came a week after Pfizer Inc. and BioNTech SE revealed a protection rate of more than 90% protection against disease. Moderna slightly one-upped its rivals, estimating that its shot is 94.5% effective at preventing COVID-19. Both results are highly impressive for inoculations developed at historic speed.

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