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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.

Scoop: Trump-backed Perdue says he wouldn’t have certified Georgia 2020 results

Perdue at a December 2020 campaign event in Columbus, Ga. Photo: Elijah Nouvelage/Getty Images

Georgia gubernatorial candidate David Perdue wouldn’t have signed the certification of the state’s 2020 election results if he had been governor at the time, the former Senate Republican told Axios.

  • “Not with the information that was available at the time and not with the information that has come out now. They had plenty of time to investigate this. And I wouldn’t have signed it until those things had been investigated and that’s all we were asking for," he said.

Why it matters: There has been no evidence widespread fraud took place in Georgia's elections last year and the November results were counted three times, once by hand.

Beijing Olympics: These countries have announced diplomatic boycotts

Photo: Zhang Qiang/VCG via Getty Images

Several countries, including Canada and Australia, have announced they will join the U.S. in a diplomatic boycott of the 2022 Beijing Winter Olympics to protest human rights abuses committed by China's government.

Driving the news: Leaders have faced pressure from human rights groups and others to boycott the Games, pointing to the ongoing genocide of Uyghurs and other Muslim minorities in China's Xinjiang region and other abuses.