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Vaccines prevent between 2.5 and 4 million deaths every year.
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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.