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Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

Gangrene of the toes and foot as a result of an infection often means eventual amputation. Gangrene of the toes and foot as a result of an infection often means eventual amputation.
Chain of Infection Chain of Infection
Implications for infection control Implications for infection control
Pus-forming infection. Such infections occur more frequently in individuals with immunoglobulin ... Pus-forming infection. Such infections occur more frequently in individuals with immunoglobulin ...
Time course of HIV infection. Time course of HIV infection.
One surface barrier to infection One surface barrier to infection
Video: Atrophy

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