From the Centers for Disease Control and Prevention. Pneumonia and influenza death rates--United States, 1979-1994.
D000328:Adult; D000368:Aged; D006801:Humans; D007251:Influenza, Human / Q000401:mortality*; D008875:Middle Aged; D011014:Pneumonia / Q000401:mortality*; D014481:United States / Q000453:epidemiology