WASHINGTON (Reuters) - Human tests of an experimental vaccine show it is effective at stimulating the immune system to fight the bird flu strain that experts worry could spur a worldwide pandemic, a top government scientist said on Saturday.
The findings are a step forward but do not overcome the major hurdle of producing enough vaccine to meet demand in the event of a flu pandemic, said Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases. The vaccine is grown in chicken eggs and production can take months.