Influenza (Flu)

Seasonal flu, avian flu, and pandemic flu are not the same.

Seasonal Flu

Seasonal (or common) flu is a viral respiratory illness that can be spread person to person. Most people have some immunity, and a vaccine is available.

Avian Flu

Avian (or bird) flu is caused by influenza viruses that occur naturally among wild birds. The Asian highly pathogenic H5N1 avian influenza (HPAI) strain is deadly to domestic and some wild fowl, and has occasionally been spread to humans. This type of bird flu has not yet been found in the U.S.

Pandemic Flu

Pandemic flu is human flu that causes a global outbreak, or pandemic, of serious illness. Because there is little natural immunity, the disease can spread easily from person to person. Currently, there is no pandemic flu.