Oxygen therapy has been effective in the treatment of a critically ill patient infected with the new strain of coronavirus in South Korea, local health authorities said Friday.

Jeong Eun-kyeong, director of Korea Centers for Disease Control and Prevention, said one of the remaining 21 COVID-19 patients in the country was still in critical condition this week. The patient's symptoms have been improving after oxygen was administered using a face mask, local news service Newsis reported.

Jeong said the therapy raises the degree of oxygen saturation in the patient through the delivery of high concentrations of oxygen. The therapy does not require the use of a respirator, the South Korean official said.

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