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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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People about to have surgery must tell their health care providers about all supplements they take.
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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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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.