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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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.