A viral outbreak among animals is a two-prong problem. Not only could the virus spread in a wild species with extremely reduced populations and present a conservation concern, but passing the virus from humans to animals could also result in additional variants.
. That means that compared with people who didn’t get the vaccine, those who did were 95% less likely to become sick with COVID-19. To calculate this type of vaccine effectiveness, you first have to determine the risk of getting COVID-19 for both groups of people — the vaccinated and the unvaccinated. Then you use a simple equation to calculate how much the risk was reduced for vaccinated people compared with unvaccinated people.. First you take the risk for unvaccinated people and subtract the risk for vaccinated people. Then you take that difference and divide by the risk for unvaccinated people.
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