The once-unthinkable death toll in the U.S. means that more Americans have died from the virus than were killed in the Vietnam and Korean wars combined.

Officials said at least 69 cases so far this week have been linked to a cluster of infections at a logistics facility operated by Coupang Corp, one of the country's largest online shopping firms, in Bucheon, west of Seoul.

Big crowds turned out for the Memorial Day weekend in the U.S. amid warnings from authorities about people disregarding the coronavirus social-distancing rules and risking a resurgence of the scourge that has killed nearly 100,000 Americans.

With the virus far from vanquished, the reopenings could prove to be a stop-and-start, two-steps-forward-one-step-back process.

China now has the capacity to perform 1.5 million nucleic acid tests per day, National Health Commission Guo Yanhong told reporters Saturday.

Investigators have struggled to find around 2,000 people wanted for testing, an effort complicated by public criticism of the clubgoers and concerns about discrimination against the LGBTQ community.

Worldwide, the virus has infected a confirmed 4.1 million people and killed more than 280,000, including over 150,000 in Europe and about 80,000 in the U.S., according to a tally by Johns Hopkins University.

Both China and South Korea reported new spikes in coronavirus cases on Sunday, setting off fresh concerns in countries where local outbreaks had been in dramatic decline.

The outbreak came just as the country has eased some social distancing restrictions and is seeking to fully reopen schools and businesses.

Worldwide, the virus has infected at least 3.9 million people and killed more than 270,000, according to a tally by Johns Hopkins University based on data reported by governments.