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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

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Though newer “smart” infusion pumps are increasingly becoming more sophisticated, they cannot prevent all programming and administration errors. Health care professionals that use smart infusion pumps must still practice the rights of medication administration and have other professionals double-check all high-risk infusions.

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Bacterial cell division. Bacterial cell division.
Mixing bacterial genotypes produces rare recombinants Mixing bacterial genotypes produces rare recombinants
Chain of Infection Chain of Infection
Frog muscle - depressor mandibulae, latissimus dorsi (labeled) Frog muscle - depressor mandibulae, latissimus dorsi (labeled)
Infection prevention and control Infection prevention and control
Cutaneous granulomatous lesions on the face of a man suffering from a dermatophytic infection. Cutaneous granulomatous lesions on the face of a man suffering from a dermatophytic infection.
Video: Introduction to Autism

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