Calling all volunteers: The government is putting out a call for thousands of men, women and children to agree to test out the first swine flu vaccine shots.
As the United States readies for a potential fall surge of the virus, health officials are preparing to conduct clinical trials on potential vaccines.
Today, the government announced eight medical centers where testing will take place, likely next month.
Watch "World News With Charles Gibson" tonight at 6:30 p.m. ET for the full...Full Story