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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.

Big European soccer teams announce breakaway league

Liverpool's Mohamed Salah (L) after striking the ball during the UEFA Champions League Quarter Final Second Leg match between Liverpool F.C. and Real Madrid at Anfield in Liverpool, England, last Wednesday. Photo: John Powell/Liverpool FC via Getty Images

12 of world soccer's biggest and richest clubs announced Sunday they've formed a breakaway European "Super League" — with clubs Manchester United, Liverpool, Barcelona Real Madrid, Juventus and A.C. Milan among those to sign up.

Why it matters: Britain and Italy's prime ministers are among those to express concern at the move — which marks a massive overhaul of the sport's structure and finances, and it effectively ends the decades-old UEFA Champions League's run as the top tournament for European soccer.

3 hours ago - Politics & Policy

Senate Democrats settling on 25% corporate tax rate

Sen. Joe Manchin (D-W.Va.). Photo: Chip Somodevilla/Getty Images

The universe of Democratic senators concerned about raising the corporate tax rate to 28% is broader than Sen. Joe Manchin, and the rate will likely land at 25%, parties close to the discussion tell Axios.

Why it matters: While increasing the rate from 21% to 25% would raise about $600 billion over 15 years, it would leave President Biden well short of paying for his proposed $2.25 trillion, eight-year infrastructure package.