Surveillance and impact of influenza in the United States.
Klimov
A
A
Influenza Branch, G-16, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
Simonsen
L
L
Fukuda
K
K
Cox
N
N
D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology* / Q000401:mortality; D009017:Morbidity / Q000639:trends; D018571:Sentinel Surveillance; D014481:United States / Q000453:epidemiology