A sickness like this breaking out in Korea would probably be just as deadly as it is currently Mexico City considering how densely populated a city like Seoul is:

A 51-year-old South Korean woman who recently toured Mexico is the first probable case of swine flu here, health authorities said Tuesday, raising concerns over a domestic outbreak of the deadly disease.

The woman, whose identity was withheld, has been quarantined at a state-designated hospital for treatment, the state-run Korea Centers for Disease Control (KCDC) said in a statement. Her body samples will be sent to the Centers for Disease Control and Prevention of the United States for further tests, it added.

The woman was among three travelers who recently returned from trips to Mexico. The other two were found not to carry the influenza virus after being quarantined at their homes where anti-viral drugs were administered, the agency said.

“We conducted a throat swab test on the patient and found that the women probably suffers from swine influenza,” KCDC said. “She tested positive for type-A virus.”  [Yonhap]

Hopefully they were able to get her quarantined before this virus could spread.