2 companies say their vaccines are 95% effective. What does that mean?

2 companies say their vaccines are 95% effective. What does that mean?




Courtesy of University of Maryland School of Medicine via AP (File)
The first patient enrolled in Pfizer’s COVID-19 coronavirus vaccine clinical trial at the University of Maryland School of Medicine in Baltimore receives a shot on May 4, 2020. Pfizer announced Wednesday, Nov. 18, 2020,…



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