South Korea became the first country to officially announce a second wave of the novel coronavirus after a recent resurgence of cases.Jeong Eun-kyeong, director of the Korea Centers for Disease Control and Prevention, said during a briefing Monday the new wave stemmed from multiple nightclub visits during a holiday weekend in early May, and is concentrated in the greater Seoul region, an area which had previously seen few cases despite its dense population.“In the metropolitan area, we believe that the first wave was from March to April, as well as February to March,” Jeong said. “Then we see that the second wave, which was triggered by the May holiday, has been going on.” Coronavirus: South Korea says it’s battling ‘second wave’ of.