Omicron Is Driving Delta Into the Ground
Pour one out for Delta, the SARS-CoV-2 variant that Season 3 of the pandemic seems intent on killing off. After holding star billing through the summer and fall of 2021, Delta’s spent the past several weeks getting absolutely walloped by its feistier cousin Omicron—a virus that’s adept at both blitzing in and out of airways and dodging the antibodies that vaccines and other variants raise. In late November, Delta made up essentially all the SARS-CoV-2 infections that researchers were sequencing in the United States. Now it’s a measly 0.1 percent. As for the rest? It’s an Omicron show.
The global portrait’s a bit patchier, but by and large, “Delta won’t be able to compete,” Karthik Gangavarapu, a computational biologist at UCLA, told me. “My suspicion is that Omicron will take over.” It’s a fair Delta and Omicron might co-circulate in a vicious variant one-two punch. Katia Koelle, an evolutionary virologist at Emory University, told me she used to worry about that possibility when the world knew little about Omicron’s competitive edge, but “less so now.” Katie Gostic, an infectious-disease modeler at the University of Chicago, agrees that Delta’s doom is probably nigh. And if so, “good riddance,” she told me.
