South Korea’s daily increase in coronavirus infections exceeded 500 for the fourth straight day, a pace unseen since January, as experts raise concern about another viral surge amid a slow rollout in vaccines.

The 543 new cases reported by the Korea Disease Control and Prevention Agency on Saturday brought the national caseload to 104,736, including 1,740 deaths.

More than 320 of the new cases came from the Seoul metropolitan area, home to half of the country’s 51 million people, where officials have struggled to stem transmissions tied to various places, including bars, offices, factories, schools, and gyms.

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