2. Severity looks stable
When the Delta variant began spreading this summer, many people worried that it was both much more contagious than earlier versions of the virus and much more severe. Only one of those two fears seems to be true.
Delta is clearly more contagious, which is the main reason that every metric of the pandemic — cases, hospitalizations and deaths — soared this summer. But a typical Covid case during the Delta wave was about as severe as a typical case during the earlier stages of the pandemic. During the wave in late 2020 and early this year, about 1.2 percent of positive cases led to death; during the Delta wave, the share was 1.1 percent.
Scientific studies trying to answer the severity question more precisely have come to conflicting conclusions. Some have found Delta to be more severe than other versions of the virus, and others have found that it is not. Until the research becomes clearer, the best guess may be that Delta is modestly more severe, which could explain why hospitalizations and death rates have held steady even as vaccination rates have risen.
“Delta may be a little more serious, but not materially so,” Dr. Robert Wachter, chair of the department of medicine at the University of California, San Francisco, told me.
This pattern can influence how you think about your day-to-day activities. If you are vaccinated (and boosted, if eligible) and you were comfortable socializing indoors and without a mask last spring, you can probably feel comfortable doing so again, now or soon. Wachter adds: “Some older people or those with medical conditions may want to be sure that everybody else indoors with them is vaccinated before removing their mask.”
3. The U.S. is underperforming
Despite all the encouraging news, one shadow still hangs over the U.S.: The pandemic does not need to be nearly as bad it is.
About 1,500 Americans have died of Covid every day over the past week. For older age groups, the virus remains a leading cause of death. And the main reason is that millions of Americans have chosen to remain unvaccinated. Many of them are older and have underlying medical conditions, leaving them vulnerable to severe versions of Covid.