Researchers at a South Korean university say they have discovered a candidate strain for an H1N1 vaccine, though it has not yet been approved by health authorities in the United States or the World Health Organization. The strain is a genetically modified version of a live virus, and could lead to a vaccine against H1N1 — commonly known as swine flu, said Seo Sang-heui, a professor at Chungnam National University’s College of Veterinary Medicine in South Korea
