What we need to understand about the Omicron variant
Ashish Jha asks: How worrisome is Omicron? There are three key questions that help scientists understand how consequential any variant might be. The first question is whether the variant is more transmissible than the current, prevalent Delta strain? Second, does it cause more severe disease? And third, will it render our immune defenses — from vaccines and prior infections — less effective (a phenomenon known as immune escape)? On transmissibility, the data, while early, look worrisome. This new variant appears…