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Vaccines prevent between 2.5 and 4 million deaths every year.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.