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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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