A Vietnamese transit passenger has been quarantined at a South Korean airport and has been isolated as she was showing symptoms similar to those of Influenza A/H1N1, the nation's health authorities said on Monday.

The 22-year-old woman, who arrived from Seattle on Sunday afternoon to travel to Vietnam, is isolated in Incheon International Airport, according to the Korea Centers for Disease Control and prevention (KCDC).

The KCDC and airline officials conducted in-depth tests on the woman after discussions, an official at the KCDC said, adding that the results of the tests will come later in the evening.

Currently, she has been injected with antiviral drugs, as well as going through tests to confirm whether she is infected with the new flu, the official said.

The KCDC, at the same time, is tracing the 101 passengers who were aboard the same airplane as a precautionary measure, the official added.

Since the first report of the influenza A/H1N1 in Mexico last month, South Korea has confirmed three patients infected with the virus, all of them were released from quarantine after being treated with antiviral drugs.

(Xinhua News Agency May 18, 2009)