One swine flu vaccine – not two doses – may be enough protection from the H1N1 virus, according to two studies, both published in the New England Journal of Medicine. This is good news for the public because it means more people will be able to get the vaccination. According to the World Health Organization (WHO), the swine flu may affect one-third of the world's population, roughly 2 million people.

Learn more about swine flu and pregnancy and who the Centers for Disease Control and Prevention (CDC) is urging to get the swine flu vaccine.