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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

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