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Vaccines prevent between 2.5 and 4 million deaths every year.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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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.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.