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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.