South Korea's new coronavirus cases spiked to above 7,000 on Wednesday, and the number of critically ill patients surged to a record high.

The country added 7,456 more COVID-19 cases, including 7,365 local infections, bringing the cumulative total to 583,065, the Korea Disease Control and Prevention Agency (KDCA) said.

Wednesday's tally is sharply up from 5,318 on Monday and 5,202 on Tuesday. The number of new daily cases usually shrinks at the beginning of the week due to less testing over the weekend.

The number of critically ill patients came to a fresh high of 1,063, the authorities said. The previous high was the 1,025 reported Sunday.

The country added 78 more deaths from COVID-19, bringing the total to 4,906. The fatality rate stood at 0.84 percent, unchanged from a day earlier.

The country reported seven new omicron variant cases, bringing the total to 234, the authorities said.

On Saturday, the government reimposed a set of revised virus restrictions across the country, which will remain in effect until Jan. 2 to stem the spread of the virus.

It marks a reversal of the government's "living with COVID-19" scheme that began last month, with an aim to regain normalcy by relaxing virus restrictions in phased steps.

Under the new measures, the maximum size of private gatherings is limited to four people nationwide, from the previous limit of six in the capital area and eight elsewhere.

A 9 p.m. or 10 p.m. curfew is applied to businesses as well, depending on their type of service.

Of the locally transmitted cases, Seoul reported 2,779 infections and Gyeonggi Province that surrounds the capital logged 2,192 cases.

The KDCA said 91 cases came from overseas, raising the caseload to 16,537.

As of Wednesday, 85.1 percent of the country's 52 million people had received their first shots of COVID-19 vaccines, and 82.1 percent had been fully vaccinated, while 25.5 percent had gotten booster shots, the KDCA said. (Yonhap)