Health officials in Korea have confirmed four new cases of the H1N1 virus, raising the total number of confirmed cases in the country to 33.

The latest four patients include an American English instructor now quarantined along with other teachers who contracted the virus, her 38-year-old trainer and two Korean men returning from the United States.

Meanwhile the World Health Organization says the total number of H1N1 influenza cases worldwide now exceeds 130,000 in 48 countries.