50,000 killed; cost $1 billion.
Sobel
E
E
D000368:Aged; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D007251:Influenza, Human / Q000401:mortality / Q000517:prevention & control*; D010819:Physician's Role; D011018:Pneumonia, Pneumococcal / Q000401:mortality / Q000517:prevention & control*; D014481:United States / Q000453:epidemiology; D014611:Vaccination