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Efficacy refers to how well a vaccine works in a controlled setting, as in a clinical trial. Effectiveness, on the other hand, refers to how well it works in a real-world setting. The CDC followed 4,000 individuals who’d received shots over a period of months. It found both the Pfizer and Moderna vaccines to be 90 percent effective at preventing infection.
COVID19 Daily Update from Minnesota Native News concerning Minnesota's Native community and the coronavirus pandemic http://minnesotanativenews.org/
This program was produced from May to October 2020