Vaccines – What Does X Percent Effective Mean

95 percent effectiveness, 80 percent effectiveness – or only 70 percent effectiveness? The data on the newly developed Corona vaccines first make many people aware that vaccinations vary in effectiveness – and that no vaccination offers 100 percent protection. Already, the first people would rather not be vaccinated with the “less effective” vaccines from AstraZeneca … Vaccines: What does “X percent effective” mean?