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A "special care zone" has been set up in the South Korean city of Gyeongsan after it saw a spike in coronavirus cases.
Similar zones have been declared around neighbouring Daegu city and Cheongdo County, with face masks being provided and residents warned against travelling.
Health officials said dozens of newly commissioned military nurses are due to begin work in Daegu on Thursday to help the patients.
Meanwhile, the US military confirmed two new cases among relatives of its troops in the country.
It comes as Australia joined almost 100 nations to impose travel restrictions on South Koreans.