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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.