[Answer] Which drugmaker announced on Monday that early data showed its vaccine was over 90 percent effective in preventing Covid-19? \

Step 1 : Introduction to the question "Which drugmaker announced on Monday that early data showed its vaccine was over 90 percent effective in preventing Covid-19? \"

...1. AstraZeneca \
2. Johnson & Johnson \
3. Moderna
4. Pfizer

Step 2 : Answer to the question "Which drugmaker announced on Monday that early data showed its vaccine was over 90 percent effective in preventing Covid-19? \"

Pfizer:

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Pfizer, which developed a coronavirus vaccine with the German drugmaker BioNTech, said that an early analysis of its late-stage trial had suggested the vaccine was robustly effective in preventing Covid-19. If its efficacy rate holds up, that level of protection would put it on par with highly effective childhood vaccines for diseases such as measles. \\Pfizer plans to ask the Food and Drug Administration for emergency authorization of the two-dose vaccine later this month. By the end of the year it will have manufactured enough doses to immunize 15 million to 20 million people, company executives have said. \\Here’s what we know, and don’t know, about the vaccine.

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