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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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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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Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.