South Korean health authorities said Tuesday the nation's A/H1N1 flu infection toll rose to 121, confirming four additional cases.

According to the Ministry of Health, Welfare and Family Affairs, a 17-year-old Philippine girl residing in Hawaii, who visited South Korea for a field trip, was confirmed contracting with the virus, along with two South Korean patients from the United States and a Filipino man.

With the recent cases, South Korea's A/H1N1 flu confirmation toll stands at 121 as of Tuesday afternoon, with 43 people including five unconfirmed patients still remaining in isolated hospitals.

Health authorities here have been preparing measures against a massive outbreak of infections as more Koreans studying abroad are expected to return home over the summer.

No death case has been reported in South Korea since the first case of infection was confirmed.

Source: Xinhua