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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The longest a person has survived after a heart transplant is 24 years.