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Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

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Photo: Allen J. Schaben/Los Angeles Times via Getty Images

A 25-year-old man in Nevada has been identified as the first person in the U.S. to get COVID-19 twice, according to a study published in the medical journal The Lancet on Monday.

Why it matters: The finding indicates that being infected with the virus "might not guarantee total immunity in all cases," the study's researchers write. It also calls into question the value of any potential source or indicator of immunity — whether that's antibody testing, the use of blood plasma as a treatment, or perhaps even a vaccine, per Axios' Sam Baker.

  • People who have been infected "should take identical precautions" as those who have never had it, the researchers write.

The big picture: The Nevada case is the fifth confirmed reinfection worldwide since scientists documented the first reinfection in Hong Kong in August, per NPR.

Worth noting: The Nevada patient first tested positive on April 18, and again on June 5. He tested negative twice in between the cases, according to the study.

  • His symptoms were more severe during the second infection.

The bottom line: The finding could have significant implications regarding the efficacy of a potential coronavirus vaccine, which "might not result in a level of immunity that is 100% protective for all individuals," the researchers wrote.

Read the full study, via DocumentCloud:

Go deeper

Jan 20, 2021 - Health

Amazon offers to help Biden administration with COVID vaccine efforts

Amazon CEO Jeff Bezos at the White House with Jill Biden in 2016. Photo: Chip Somodevilla/Getty Images

Amazon's worldwide consumer CEO Dave Clark has offered to help the Biden administration with its coronavirus vaccination goals by mobilizing efforts to inoculate its employees, according to a letter sent to President Biden on Wednesday.

Why it matters: As demand for the coronavirus vaccine is outstripping supply, Amazon has about 800,000 employees, many of whom are essential workers. The Biden administration wants to vaccinate 100 million Americans in 100 days.

Mike Allen, author of AM
2 hours ago - World

Courage vs. coddling with China

Peng Shuai of China serves during the China Open in Beijing in 2017. Photo: Andy Wong/AP

The women's professional tennis tour suspended tournaments in China Wednesday out of concern for Peng Shuai, on the same day that a top business voice made excuses for Beijing.

Why it matters: Ahead of February's Winter Olympics in Beijing, some sports figures are taking on the regime — while Big Business shrinks from confrontation with the world's second-largest economy.

3 hours ago - Sports

What to know about the first MLB lockout since 1995

Illustration: Shoshana Gordon/Axios

Hope you enjoyed the recent flurry of free-agent activity, because it's likely the last non-lockout-related MLB news for a while.

Driving the news: The owners locked out the players after the collective bargaining agreement expired at midnight last night, leading to MLB's ninth work stoppage — and first since 1995.