South Korea's daily coronavirus cases dropped under 1,500 on Monday due to fewer tests as health authorities focus on their virus response during the Chuseok holiday that starts this week.

The country added 1,433 COVID-19 cases, including 1,409 local infections, raising the total caseload to 274,415, according to the Korea Disease Control and Prevention Agency (KDCA).

The latest caseload was down 322 from 1,755 cases the previous day. Virus cases usually begin spiking Wednesday when more people receive tests.

Daily cases have stayed above the 1,000 threshold for more than two months amid the fast spread of the more transmissible delta variant nationwide.

The country added one more death from COVID-19, raising the death toll to 2,360.

Infections in the greater Seoul area have been hampering the authorities' containment efforts, with more than 70 percent of domestic cases being reported in Seoul, Gyeonggi Province and Incheon.

Health authorities are particularly worried about further upticks in virus cases after the Chuseok holiday, the Korean autumn harvest celebration, when tens of millions of people are expected to travel across the country. South Koreans will have a five-day holiday period through Wednesday.

To curb infections, the authorities decided to extend the current social distancing measures -- Level 4 in the greater Seoul area, which is the highest in the four-tier system, and Level 3 in other regions -- for another four weeks through Oct. 3.

While the country is limiting the size of private gatherings and restaurant business hours, it has eased some restrictions to give leeway to vaccinated people.

A total of 33.15 million people, or 64.6 percent of the country's population, have received their first shots of COVID-19 vaccines, and 20.06 million people, or 39.1 percent, have been fully vaccinated, the KDCA said.

South Korea's COVID-19 vaccination program has been using vaccines from Moderna, Pfizer, AstraZeneca and Janssen.

The country aims to provide at least one jab to 70 percent of the population by the end of September with hopes of reaching herd immunity in November.

Of the newly confirmed domestic cases, 554 were from Seoul, 395 from the surrounding Gyeonggi Province and 151 from the western port city of Incheon.

Busan, the country's second-largest city, reported 35 cases, while South Chungcheong Province added 58 cases.

Imported cases, which include South Korean nationals, came to 24, down six from the previous day. The total number of imported cases is now at 13,969.

The number of patients with serious symptoms across the country reached 342, down nine from the previous day.

The total number of people released from quarantine after making full recoveries was 245,505, up 1,046 from a day earlier. (Yonhap)