SEOUL (REUTERS) - South Korea on Sunday (Feb 6) surpassed one million cumulative Covid-19 cases since the pandemic began, as health officials reported a daily record of 38,691 new infections driven by an Omicron variant outbreak.

South Korea saw its first confirmed Covid-19 case on Jan 20, 2020, and soon became the first country outside China to battle a major outbreak.

An aggressive strategy of tracking, tracing, masking and quarantining helped South Korea to blunt that initial wave and keep overall cases and deaths low without widespread lockdowns, but the spread of the Omicron variant is driving case numbers to new highs.

Deaths have remained low in the highly vaccinated country, however, with 15 new deaths reported as at midnight on Saturday, according to the Korea Disease Control and Prevention Agency.

Daily cases are nearly five times higher than they were two weeks ago, when Omicron began to dominate, but serious infections have remained at manageable levels so far, the authorities have said.

Officials on Friday announced that they would extend social distancing measures for at least another two weeks, including a 9pm curfew on businesses and a six-person limit for private gatherings.

Overall, South Korea has reported 1,009,688 Covid-19 cases, with 6,873 deaths.

Nearly 86 per cent of the country's 52 million population are fully vaccinated, with more than 54.5 per cent having received booster shots.