Final answer:
Giardia Duodenalis, also known as Giardia lamblia, is a parasite that thrives in contaminated water or food and causes the illness giardiasis. It is transmitted via the fecal-oral route and can be treated with antibiotics.
Step-by-step explanation:
Giardia Duodenalis, commonly known as Giardia lamblia, Giardia intestinalis, or Giardia duodenalis, is a parasite that is most commonly found in contaminated water or food. This protozoan parasite causes giardiasis, a type of gastroenteritis characterized by severe diarrhea and other digestive discomforts. The transmission method of G. lamblia is through the fecal-oral route, and individuals who are at greater risk of contracting this parasite include travelers, backpackers, campers, and those in close contact with infected people or animals. Giardiasis can be diagnosed with a stool sample and treated with specific antibiotics, such as Flagyl. Unfortunately, there is no vaccine to prevent Giardiasis at this time.