Final answer:
Giardiasis is a gastrointestinal disorder caused by the protozoan Giardia intestinalis, resulting from contaminated food or water intake. Symptoms include diarrhea and abdominal pain, and treatment may necessitate antibiotics.
Step-by-step explanation:
Gastrointestinal Disorder Caused by Giardia intestinalis
The gastrointestinal disorder caused by the flagellated protozoan Giardia intestinalis is known as giardiasis. This condition is a type of gastroenteritis that often results from ingesting contaminated food or water. The Giardia parasites attach themselves to the lining of the small intestine using a large adhesive disk, which disrupts nutrient absorption and can lead to symptoms such as diarrhea, abdominal pain, and malnutrition. While giardiasis is typically self-limiting, severe or persistent cases might require treatment with antibiotics. Prevention of giardiasis includes good hygiene practices and ensuring safe drinking water.
Among other protozoan infections such as cryptosporidiosis, amoebiasis, and cyclosporiasis, giardiasis stands out due to the Giardia protozoa's unique method of attachment to the intestinal mucosa, which can create significant discomfort and lead to chronic health issues if untreated.