Faye Flam: How worried should you be about omicron BA.5?

The ways we think about the COVID-19 pandemic have evolved with the virus: In 2020, it was a potentially deadly threat we could avoid by being careful; in 2021, it was something that was likely to infect everyone eventually; and now, it’s becoming seen as a persistent health hazard that can reinfect people multiple times, each time inflicting cumulative damage and increasing the odds of long-duration symptoms.