The coronavirus is here forever. This is how we live with it.

Reinfections with the four common coronaviruses are likely driven by a combination of our immunity fading and the viruses themselves evolving. Putting together everything we do know, a pattern starts to emerge: We are likely first exposed to these common coronaviruses as children, when the resulting disease tends to be mild; our immune systems get rusty; the virus changes; we get reinfected; the immune response is updated; the immune system gets rusty again; the virus changes again; we get infected. And so on.

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In the best case, COVID-19 will follow the same pattern, with subsequent infections being mild, says Stephen Morse, an epidemiologist at Columbia University. “If the burden of disease is not high, we take [the virus] very much for granted,” he says. Still, these colds are not completely benign; one of the common-cold coronaviruses has caused deadly outbreaks in nursing homes before. In a less good scenario, COVID-19 looks like the flu, which kills 12,000 to 61,000 Americans a year, depending on the season’s severity. But deaths alone do not capture the full impact of COVID-19. “A big question mark there is long COVID,” says Yonatan Grad, an immunologist and infectious-disease researcher at Harvard. There are still no data to prove how well the vaccines prevent long COVID, but experts generally agree that a vaccinated immune system is better prepared to fight off the virus without doing collateral damage.

The transition to endemic COVID-19 is also a psychological one. When everyone has some immunity, a COVID-19 diagnosis becomes as routine as diagnosis of strep or flu—not good news, but not a reason for particular fear or worry or embarrassment either. That means unlearning a year of messaging that said COVID-19 was not just a flu. If the confusion around the CDC dropping mask recommendations for the vaccinated earlier this summer is any indication, this transition to endemicity might be psychologically rocky. Reopening felt too fast for some, too slow for others. “People are having a hard time understanding one another’s risk tolerance,” says Julie Downs, a psychologist who studies health decisions at Carnegie Mellon University.

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