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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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The average office desk has 400 times more bacteria on it than a toilet.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Deformation in human bones caused by (a) rickets and (b) osteoporosis. Deformation in human bones caused by (a) rickets and (b) osteoporosis.
External and cross-sectional view of an infarct caused by a myocardial infarction. External and cross-sectional view of an infarct caused by a myocardial infarction.
Electron Microscope Image of a Fly Foot Electron Microscope Image of a Fly Foot
Pneumonia. This common lung inflammation may be caused by bacteria, viruses, or fungi and is often d Pneumonia. This common lung inflammation may be caused by bacteria, viruses, or fungi and is often d
Thumbwalking the spinal reflex on the medial edge of the foot. Thumbwalking the spinal reflex on the medial edge of the foot.
Botulism A rare but serious paralytic illness caused by the bacterium Clostridium botulinum Botulism A rare but serious paralytic illness caused by the bacterium Clostridium botulinum
Video: Mechanisms of capillary exchange

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