Influenza symptoms. influenza (also known as the flu) is a contagious respiratory illness caused by flu viruses. it can cause mild to severe illness, and at times can.

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Figure 2. Prevalence of pH1N1 vaccination coverage among women with a ...

Pneumonia and Influenza (P&I) Mortality Surveillance

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Influenza symptoms. influenza (also known as the flu) is a contagious respiratory illness caused by flu viruses. it can cause mild to severe illness, and at times can. Listen to/view cdc podcasts on your computer or download them for reliable health and safety information when and where you want...