South Korea’s new coronavirus cases stayed below 4,000 for the second straight day Friday, but critical cases rose to a record high amid worries the virus could quickly spread under eased social distancing rules.

The country reported 3,901 new Covid-19 cases, including 3,882 local infections, raising the total caseload to 432,901, Yonhap news agency reported, citing the Korea Disease Control and Prevention Agency (KDCA).

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The number was down from 3,938 on Thursday. It was also down from 4,115 reported Wednesday, which was the highest since the first case was reported in South Korea in January 2020.

Critically ill patients hit an all-time high of 617, up five from the previous high on Thursday. The country added 39 more deaths from Covid-19, bringing the death toll to 3,440.

Concerns have been growing of an upsurge in infections since the government began easing virus restrictions early this month for a gradual return to pre-pandemic life under the three-phase “living with Covid-19” scheme.

South Korea planned to move to the second stage in mid-December, but health authorities have warned the country may not be able to do so if the current trend continues.

Surging infections and critical cases are spawning worries about a shortage of hospital beds for treatment, especially in the greater Seoul area, home to about half of the country’s 52 million population.

“Just four weeks after we started the move toward normalcy in phases, we are facing the biggest challenge in our fight against Covid-19,” Health Minister Kwon Deok-cheol said.

“With the virus spreading fast among senior citizens and sharp increases in critical cases and deaths, the capacity of hospital beds in intensive care units are being pushed to the limit,” he said.

The government will announce toughened antivirus measures to contain the spread of the virus Monday, the minister said.

Health authorities said 1,310 patients are waiting for one or more days before hospital beds become available for them in the greater Seoul area. The number marked the largest ever since the pandemic began.

Of the locally transmitted cases, Seoul, the surrounding Gyeonggi Province and the western port city of Incheon reported 1,739, 1,115 and 245 infections, respectively. Their combined number accounted for about 80 per cent of local infections.

A total of 42.42 million people, or 82.6 per cent of the country’s population, have received their first shots of Covid-19 vaccines, and 40.76 million people, or 79.4 per cent, have been fully vaccinated.