According to Dr. Tom Frieden, Director of the CDC, there is widespread H1N1 activity in 46 states. H1N1 influenza continues to be a disease primarily involving children and young adults. "Many ...

A young girl in Pima County has died of 2009 H1N1 influenza - the 10th confirmed death here from the novel flu strain this year, health officials said Friday. The girl was younger than a preteen and ...

Both H1N1 and COVID-19 spread across the U.S. faster and more unpredictably than early detection systems could keep up.

Complications related to the upper airways, including sinusitis or otitis; Pulmonary complications, including bronchitis, asthma (sometimes with status asthmaticus), and acute exacerbations of chronic ...