Seoul Mayor Park Won-soon. Photo: Tom Williams/CQ-Roll Call, Inc via Getty Images

South Korea's President Moon Jae-in said the country should "brace for the pandemic's second wave," the BBC reports, as officials confirmed 34 new novel coronavirus cases on Sunday — the highest daily number in a month.

Why it matters: South Korea had the second-highest number of COVID-19 cases after China in early March. But diligent tracing, testing and strict lockdowns allowed the country to control the outbreak. The new cases could serve as a warning to nations grappling with how to reopen their own communities.

Driving the news: South Korea has begun relaxing social-distancing requirements. But a new cluster of coronavirus cases has emerged, stemming from a 29-year-old who visited three nightclubs in Seoul last Saturday before testing positive for the virus on Wednesday, Bloomberg notes.

  • The number of cases tied to the patient jumped to 40 as of Saturday afternoon, per Bloomberg. South Korean epidemiologists began tracing roughly 1,500 people believed to have been in those clubs around the same time, per the New York Times.
  • Seoul Mayor Park Won-soon on Saturday ordered all nightclubs, discos, hostess bars and other nightlife establishments to close as a result.

By the numbers: There are 10,844 confirmed coronavirus cases in South Korea, and 256 recorded deaths.

  • South Korea's Ministry of Health reports the number of cases increased from 10,793 on May 3 to 10,840 on May 9. For weeks, the country reported about 10 new infections per day, the Times notes.

Go deeper: World coronavirus updates

Editor's note: This article has been updated with Moon's comments and the latest case numbers.

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Updated 4 hours ago - Health

World coronavirus updates

Data: The Center for Systems Science and Engineering at Johns Hopkins; Map: Axios Visuals

The number of COVID-19 cases surpassed 20 million worldwide on Monday evening, Johns Hopkins data shows.

The big picture: World Health Organization chief Tedros Adhanom Ghebreyesus told a virtual press conference as the world approached the milestone that 750,000 deaths were set to be recorded this week. "Behind these statistics is a great deal of pain and suffering. Every life lost matters," he said. "But I want to be clear: there are green shoots of hope and... it's never too late to turn the outbreak around."

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A boy has his temperature checked as he receives a free COVID-19 test in South Los Angeles in July. Photo: Mario Tama/Getty Images

At least 97,000 children tested positive for COVID-19 in the final two weeks of July and there's been an estimated 338,000 cases involving kids in the U.S. since the pandemic began, a new report finds.

Why it matters: The report from the American Academy of Pediatrics and the Children's Hospital Association comes as schools and day cares look to reopen in the U.S.

Aug 9, 2020 - Health

Ex-FDA head: U.S. will "definitely" see 200,000 to 300,000 virus deaths in 2020

Former FDA commissioner Scott Gottlieb said on CBS News' "Face the Nation" that the coronavirus death toll in the U.S. will be "definitely" somewhere between 200,000 and 300,000 by the end of 2020.

Why it matters: "Whether we're closer to 200,000 or closer to 300,000 depends on what we do now and how it evolves," Gottlieb warned on Sunday as the U.S. surpassed five million confirmed coronavirus cases.