Can you get coronavirus twice? Doctors are unsure, even as anecdotal reports mount.

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Washington Post logoSuch assertions, if proved, could complicate efforts to make a long-lasting vaccine and to achieve herd immunity

When Sophie Cunningham, a guard for the WNBA’s Phoenix Mercury, returned to training last week after a bout with covid-19, she made an announcement that startled fans. She said she believed she had been infected twice — once in March and then again in June or July.

“They said you can only get it once, but I’ve had it twice,” she told reporters Thursday. “Hopefully, I’m done with it.”

As the United States marks its sixth month since the arrival of the coronavirus, Cunningham’s story is among a growing number of reports of people getting covid-19, the disease caused by the novel coronavirus, recovering and then falling sick again — assertions, that if proved, could complicate efforts to make a long-lasting vaccine, or to achieve herd immunity where most of the population has become immune to the virus.