more than 12,000 americans died of h1n1 (swine flu) in the united states in 2009, and 275,000 americans were hospitalized.
more than 12,000 americans died of h1n1 (swine flu) in the united states in 2009, and 275,000 americans were hospitalized.
cdc h1n1 flu | interim recommendations for clinical use of influenza diagnostic tests
more than 12,000 americans died of h1n1 (swine flu) in the united states in 2009, and 275,000 americans were hospitalized.