Giardiasis is a diarrheal illness caused by the parasite Giardia intestinalis (also known as Giardia lamblia or Giardia duodenalis). It is the most common intestinal parasite found in humans in the United States.
Globally, it infects nearly 2% of adults and 6% to 8% of children in developed countries and nearly 33% of people in developing countries have had giardiasis.
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