Seoul, May 20, 2020, SPA -- South Korean health authorities have expressed concern as the country reported the highest daily increase in novel coronavirus infections in nine days on Wednesday, dpa cited agency Yonhap. On Tuesday, 36 new cases were detected, bringing the country's total to 11,110, according to the Korea Centers for Disease Control and Prevention (KCDC). Clusters have emerged in the capital city Seoul - including a new one at the major Samsung hospital, where on Tuesday four nurses tested positive for the virus. Contact-tracing is currently underway for everyone who came in contact with the nurses. South Korean officials said they relied on intensive testing to control the outbreak, testing up to 60,000 people in relation to the Itaewon incident. The country's death toll did not increase overnight, and stands at 263. --SPA 10:37 LOCAL TIME 07:37 GMT 0006 www.spa.gov.sa/w1334012