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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

