Health authorities in South Korea said for the first time on Monday it is in the midst of a “second wave” of novel coronavirus infections around Seoul, driven by small but persistent outbreaks stemming from a holiday in May.

The Korea Centers for Disease Control and Prevention (KCDC) had previously said South Korea’s first wave had never really ended.

But on Monday, KCDC director Jeong Eun-kyeong said it had become clear that a holiday weekend in early May marked the beginning of a new wave of infections focused in the densely populated greater Seoul area, which had previously seen few cases.

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