Giardia: Causes, Symptoms and Treatment Options as well as Prevention



Giardia is a parasite found in both drinking and recreational water. The Giardia infection has become recognized as one of the most common causes of waterborne disease in the United States. This parasite lives in the intestinal tract (usually the duodenum) of people and animals, including birds.

Once somebody has been infected, this parasite lives in the intestine and is passed in the stool. Because the parasite is protected by an outer shell, it can survive outside the body and in the environment for a long time.


Physical Symptoms:

Giardia is often asymptomatic or causes relatively mild symptoms. In some patients and at certain times of physical or emotional stress, giardia can cause symptoms, such as intense itching.

Patients can experience a variety of intestinal symptoms, which include diarrhea, gas or flatulence, greasy stools that tend to float, stomach cramps, upset stomach or nausea. These symptoms may lead to weight loss and dehydration. However, some people or animals have no symptoms at all. Giardiosis is thought to have zoonotic potential (transmissable from animals to humans).



Diagnosis of Giardia can be difficult. It may be necessary to examine multiple fresh fecal smears to find the motile trophozoites. Infected birds may only shed trophozoites and cysts intermittently, rather than continuously.

Giardia Testing:

  • Fecal Trichrome. Tests for the Giardia parasite itself (the most reliable method).
  • ELISA Tests. Tests for the antibodies produced to combat the parasite
  • Crypto/Giardia IFA and fecal stain

Self-testing is an affordable alternative and is available through this webpage. Note the collection of the first morning feces will provide the best opportunity to detect the parasite. It is important to make sure that the sample is collected fresh within minutes. Because Giardia are excreted intermittently, several fecal examinations should be performed if giardiasis is suspected. Samples from three consecutive days should be examined.



The good news is that giardia is a treatable condition.

  • Antiprotozoal medications are often administered.
  • To prevent re-infection the source of the infection (contaminated water or water containers / plumbing system) needs to be identified, santifized or removed.
  • Oregano: The European herb Oregano is one of the most nutritious substances on earth, with 42 times more antioxidants than apples and 30 times more than potatoes. Additionally, it's loaded with antimicrobial compounds that fight cold-causing bacteria and researchers found that it destroys giardia. To reap the benefits, sprinkle on your food each day or follow package directions. Fresh herbs provide the greatest health benefits -- you might want to consider growing an organic herb garden that includes Oregano!
  • Goldenseal Herb: Strong antibiotic properties. It has a long history of use in infections including bacterial, viral, fungal, and parasitic. Staph, strep, E. coli, Vibrio cholera, Giardia lamblia,and even tuberculosis bacterium have proven sensitive to this herb.


GreenAndHealthy.Info strives to maintain accurate and up-to-date information; however, mistakes do happen. If you would like to correct or update any of the information, please send us an e-mail. THANK YOU!

Information contained on this website is provided as general reference only. For application to specific circumstances, professional advice should be sought.

GreenAndHealthy.Info strives to maintain accurate and up-to-date information; however, mistakes do happen. If you would like to correct or update any of the information, please send us an e-mail. THANK YOU!