H1N1 Flu Information
The CDC continues to investigate human cases of H1N1 flu in the United States and is working closely with Canada, Mexico and with the World Health Organization (WHO). As a part of its response to the outbreak, CDC is issuing new H1N1 flu guidance.
Flu terms defined — Seasonal flu, H1N1 flu, avian flu, and pandemic flu are not the same.
Last revised: May 11, 2009