A top-ranking official of the Centers for Disease Control and Prevention says production of a vaccine for swine flu virus is behind schedule and people should take precautionary steps to prevent its spread.
msnbc.com: Top msnbc.com headlines, NBC News
Wed, 10/21/2009 - 6:11am
A top-ranking official of the Centers for Disease Control and Prevention says production of a vaccine for swine flu virus is behind schedule and people should take precautionary steps to prevent its spread.