CDC (Centres for Disease Control and Prevention): Influenza
CDC works 24/7 to protect America from health, safety and security threats, both foreign and in the U.S. Whether diseases start at home or abroad, are chronic or acute, curable or preventable, human error or deliberate attack, CDC fights disease and supports communities and citizens to do the same.
WHO Regional Office for the Americas PAHO: Influenza updates (FluNet PAHO)
The influenza surveillance data is provided by Ministries of Health and National Influenza Centers of Member States to the Pan American Health Organization (PAHO) or from updates on the Member States' Ministry of Health web pages.