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Giardiasis is an intestinal illness caused by infection with the parasite Giardia lamblia, which lives in contaminated water. Although the illness most often occurs in developing countries, giardiasis is also a common cause of waterborne illness in the United States. A person can remain infected with Giardia until the infection is diagnosed and treated. In developing areas of the world, it is common for more than 20% of a country's population to have ongoing Giardia infection. In the United States, only 1 or 2 out of every 10,000 people have Giardia in a typical year, but the infection is found in about 1 out of 3 people who have prolonged diarrhea symptoms if they have recently traveled to a developing country.
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True
The answer to "The epidemiologic and clinical descriptions of a diseases......" is TRUE
Answer: A buffer is a chemical substance that helps maintain a relatively constant pH in a solution, even in the face of addition of acids or bases. Buffering is important in living systems as a means of maintaining a fairly constant internal environment, also known as homeostasis. Because all biological processes are dependent on pH, cells and organisms must maintain a specific and constant pH in order to keep their enzymes in the optimum state of protonation. This system provides the maximum buffering capacity near pH 6.86 (the pKa of H2PO4- ). Several substances serve as buffers in the body, including cell and plasma proteins, hemoglobin, phosphates, bicarbonate ions, and carbonic acid. The bicarbonate buffer is the primary buffering system of the IF surrounding the cells in tissues throughout the body.
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