Great they were able to trace the main source.
Quote:
Coronavirus: South Korea closes schools again after biggest spike in weeks
More than 200 schools in South Korea have been forced to close just days after they re-opened, due to a new spike in virus cases.
Thousands of students had earlier on Wednesday returned to school as the country began easing virus restrictions.
But just a day later, 79 new cases were recorded, the highest daily figure in two months.
Most of these cases have been linked to a distribution centre outside Seoul.
The warehouse, in the city of Bucheon, is run by the country's biggest e-commerce firm Coupang, and officials have said the facility was not strictly complying with infection control measures. Health officials even discovered traces of Covid-19 on workers' shoes and clothes.
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https://www.bbc.co.uk/news/world-asia-52845015