Pfizer: COVID Vaccine 90 Percent Effective

The COVID-19 vaccine shows a 90% efficacy rate, surpassing expectations. It uses mRNA technology to trigger an immune response. Pfizer's trial involved over 43,000 volunteers, with most infections occurring in the placebo group. Regulatory approval requires safety monitoring for two months post-second dose. Manufacturing aims for 50 million doses by year-end, with free distribution in the U.S. Despite the vaccine's promise, public health measures remain crucial as distribution will be gradual and acceptance varies.

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