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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.

1 hour ago - World

Biden freezes U.S. arms deals with Saudi Arabia and UAE

Trump struck several large arms deals with Mohammed bin Salman (L) and Saudi Arabia. Photo: Kevin Dietsch-Pool/Getty Images

The Biden administration has put on hold two big arms deals with Saudi Arabia and the United Arab Emirates which were approved in the final weeks of the Trump administration, a State Department official tells Axios.

Why it matters: The sales of F-35 jets and attack drones to the UAE and a large supply of munitions to Saudi Arabia will be paused pending a review. That signals a major policy shift from the Trump era, and may herald sharp tensions with both Gulf countries.

Dan Primack, author of Pro Rata
2 hours ago - Podcasts

Robert Downey Jr. launches VC funds to help save the planet

Robert Downey Jr. on Wednesday announced the launch of two venture capital funds focused on startups in the sustainability sector, the latest evolution of a project he launched two years ago called Footprint Coalition.

Between the lines: This is a bit of life imitating art, as Downey Jr. spent 11 films portraying a character who sought to save the planet (or, in some cases, the universe).