By the numbers. Vital statistics.
D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology; D003141:Communicable Diseases / Q000453:epidemiology*; D019049:Developed Countries / Q000706:statistics & numerical data; D003906:Developing Countries / Q000706:statistics & numerical data; D019538:Health Care Surveys; D005102:Health Expenditures / Q000145:classification / Q000706:statistics & numerical data; D006801:Humans; D008017:Life Expectancy; D017057:Medically Uninsured / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology; D014798:Vital Statistics; D014901:West Nile Fever / Q000453:epidemiology