South Korea on Tuesday confirmed its 23rd case of swine flu following a sharp weekend rise in reported infections.
A 28-year-old Korean woman who arrived from New York via Tokyo on Sunday was confirmed to be suffering from A(H1N1) influenza, the health ministry said.
She was moved to a state-designated quarantine area after being stopped at the airport when she showed symptoms. Over the weekend health authorities confirmed infections in three children who arrived from New York, and in nine foreigners who had trained together to work as English teachers.
Some of the foreigners had been sent to language institutes in different cities nationwide before being quarantined, sparking concerns that the virus could spread in those areas.
The worldwide death toll for swine flu neared 100 on Monday with new deaths in North America, while a number of new cases emerged in Europe, Asia and Latin America.
According to the latest tally from the World Health Organization, 12,515 people have been infected with A(H1N1) across 46 countries and 91 of them have died. But reports from local authorities would bring the global toll to 97.