The 1,275 cases reported Thursday exceeded the number of daily cases reported during South Korea’s third wave peak.
South Korea has reported its highest daily jump in new COVID-19 infections as authorities have considered tightening social distance restrictions.
The 1,275 new homes announced Thursday marked the second straight day above 1,200 and surpassed the previous record of a day of 1,240 set at the peak of the country’s third wave in December.
More than 1,000 of the infections were in the largest area of Seoul, which hosts half of South Korea’s 51 million people.
The government warned Wednesday that it was considering raising movement restrictions to the highest level as the fourth wave spreads rapidly, particularly among unvaccinated people aged 20 to 30.
The rise of the Delta variant has also worried health officials.
According to the Yonhap news agency, the current rules of social disengagement in Seoul include a ban on private meetings of five or more people and a 22:00 (13:00 GMT) curfew in restaurants. The boards will be reviewed next week.
Only 10 percent of the country’s population of 52 million people has been fully vaccinated, while 30 percent have received at least one stroke, most of them people over 60 years of age.
The total number of COVID-19 infections in South Korea is 164,028, with 2,034 deaths.