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.


Russian drone strike kills 12 miners in Ukraine
Five-year-old boy returns to Minnesota after ICE release
Reopening of Gaza's Rafah crossing expected Monday
Winter storm death toll in United States reaches 90
Pakistan says 145 militants killed after attacks in Balochistan
Israeli strikes kill 26 in Gaza, health officials say
US government starts likely brief shutdown as House fails to approve deal
Thousands demonstrate in Minnesota and across US to protest ICE
