South Korea's daily new coronavirus cases continued to hover around 400 on Friday amid the country's vaccination push, with a potential resurgence in spring still worrisome amid prolonged pandemic fatigue and an increase in more contagious COVID-19 variants.

The country reported 398 more COVID-19 cases, including 381 local infections, raising the total caseload to 91,638, the Korea Disease Control and Prevention Agency (KDCA) said.

The daily caseload was down from 444 cases recorded Wednesday and 424 cases Thursday.

The country added eight more deaths from COVID-19, raising the total to 1,627. The fatality rate was 1.78 percent.

South Korea reported more than 1,000 daily cases in late December before it saw a downward trend. The daily tally has been largely stagnant recently, staying around 300 and 400.

The country has administered vaccinations to a total of 225,853 people since launching a mass vaccination campaign last Friday, with an additional 67,153 getting the shots Thursday, according to the KDCA. The country's vaccination rate is now at 0.43 percent.

AstraZeneca's vaccine accounted for 221,944, while Pfizer's took up 3,909.

The vaccination campaign is expected to pick up pace as more people in COVID-19 vaccination priority groups, including medical workers and patients at nursing homes, get the shots. The country aims to achieve herd immunity by November.

The KDCA said some 2.1 million doses of AstraZeneca vaccines for 1.05 million people will be supplied to South Korea by May, with 690,000 doses scheduled to arrive this month under the World Health Organization's global vaccine COVAX Facility project.

One million doses of Pfizer's vaccine will be imported this month, with an additional 6 million doses to be supplied here in the second quarter of the year, the KDCA added.

A total of 1,578 cases of side effects after vaccinations have been reported so far, up 860 from a day earlier, although 1,558 of them were mild symptoms.

An additional six suspected cases of anaphylactoid reaction, which has similar symptoms to anaphylaxis, a serious allergic reaction after immunization, have been reported, raising the total of such cases to 13.

Health authorities are looking into seven cases of deaths reported after vaccinations, adding that a potential causal relationship between the vaccinations and the deaths will be investigated.

Amid the vaccination push, health authorities are still worrying about a potential uptick in new cases in spring as citizens, weary of year-long virus curbs, may have more contact with one another.

Although concerns of cluster infections persist, health authorities said they will allow visitations to nursing homes if visitors wear protective gear and have tested negative for the virus.

"People's movements are increasing after the Lunar New Year holidays," Yoon Tae-ho, a senior health official, said. "We are seeing stagnation in new virus cases, but we cannot rule out the possibility that infections can surge again."

Health authorities are also closely monitoring the spread of more contagious COVID-19 variants. As of Thursday, the country had confirmed 162 such cases since confirming the first variant case in October, with six of them being identified this week.

Of them, 138 were the Britain variant, followed by the South African strain with 18 and the Brazilian strain with six.

To stem the further spread of the new coronavirus, the country extended its social distancing rules, including bans on private gatherings of five or people, through March 14.

The country unveiled a draft for a four-tier social distancing system that allows merchants, such as cafes and restaurants, to do business under voluntary containment efforts.

The revamped rules will be applied if the spread of the virus slows down and health authorities impose the revamped Level 1 distancing rules.

Health authorities plan to finalize the new social distancing scheme by the end of the month.

The country has been using a five-tier social distancing system since November. Previously, it implemented a three-level system.

The greater Seoul area, home to about half of the nation's 52 million population, is currently under Level 2, the third highest in its five-tier system, and other regions are placed under Level 1.5.

Of the new locally transmitted cases, 129 additional cases were reported in Seoul and 168 in Gyeonggi Province that surrounds the capital. Incheon, 40 kilometers west of Seoul, identified 12 new cases.

Among virus clusters, a restaurant in southwest Seoul added three more cases, raising the total to 37. Cluster infections involving foreign workers in Dongducheon, just north of Seoul, increased by 11 to 114.

A call center in Gwangju reported three additional cases, increasing the related caseload to 73.

The number of cases linked to a college student meeting in Daegu rose by three to 31. The number of cases tied to a box manufacturing firm in Icheon, south of Seoul, reached 39 after it reported five more cases.

There were an additional 17 imported cases, down six from a day earlier, increasing the total caseload to 7,146. Of the new imported cases, six were from the United States followed by the Philippines with four.

The number of seriously or critically ill COVID-19 patients was 135, down five from the previous day.

The total number of people released from quarantine after making full recoveries was 82,560, up 398 from a day earlier, with 7,451 people being isolated for COVID-19 treatment, down eight from a day ago.

South Korea has carried out 6,789,011 COVID-19 tests, including 37,111 from the previous day. (Yonhap)