Types of Flu
Wisconsin's Flu Resource

Types of Flu
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Seasonal flu is a respiratory illness that can be transmitted person to person. Most people have some immunity, and a vaccine is available.



Pandemic flu is virulent 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.

Elbow Sneeze

2009 H1N1 flu is an influenza virus that causes illness in people. This new virus was first detected in people in the United States in April 2009



Avian flu (AI) is caused by influenza viruses that occur naturally among wild birds. Low pathogenic AI is common in birds and causes few problems. Highly pathogenic H5N1 is deadly to domestic fowl, can be transmitted from birds to humans, and is deadly to humans. There is virtually no human immunity and human vaccine availability is very limited.

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