Vaccines prevent between 2.5 and 4 million deaths every year.
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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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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
Structures of the oral cavity, pharynx, and esophagus.
Head of an Oba, Nigeria, Africa, Edo, Court of Benin.
Oral pseudo membraneous candidiasis in a patient with AIDS.