6 Key Facts About Giardia (2024)

Six important things you need to know about Giardia

Summary: Giardia can become quite a problem when you don't know what you are dealing with, that's why our very own Dr. Barrientos has answered the top 6 questions about this parasite.

What is Giardia?

Giardia is a very common intestinal parasite, not like a worm, bacteria, or virus, it's a protozoan parasite. It is a unicellular parasite that lives in the intestines of dogs and cats, it can actually affect humans as well and cause gastrointestinal upset, vomiting and diarrhea, and poor growth in dogs. The name of the infection this parasite causes is Giardiasis.

Giardiasis may be a relevant factor for illnesses, especially diarrhea, in both animals and people. However, many dogs infected with Giardia do not get diarrhea, vomiting, or any other signs of illness.

What happens when Giardia is untreated?

Some dogs can get quite sick. These could show variable levels of dehydration, vomiting, and diarrhea. Younger dogs that are in the growth phase can not reach their growth potential and become unthrifty. Occasionally you have some dogs who are able to suppress the Giardia on their own and they don't look like they're sick. Even so, they can be transmitting the Giardia to other dogs in the park, so it is important to test for it by doing a fecal sample and if positive, treat it.

What does Giardia poop look like in dogs?

Generally, a dog that has Giardia will have softish bowel movements. Sometimes it can range from the kind of moderately soft, like melted ice cream all the way to severe diarrhea. So that's the most common sign. Occasionally you will have some dogs that are positive for Giardia that have a normal stool, that is why testing is so important.

How is Giardia diagnosed and treated?

Giardia can be very easily diagnosed through a fecal sample or a stool sample. The treatment involves medication, normally called Fenbendazole, as a first choice, if that doesn't work, we use something called Metronidazole. It can be a very resilient parasite, which may need multiple bouts of treatment to eliminate it. In addition to medication, things like a good digestible diet and probiotics are also effective in controlling the parasite. Some dogs may require follow-up tests and treatments based on their condition and the severity of the infection. All infected pets should be re-tested two to four weeks after completion of treatment.

Can I get Giardia from my dog licking me?

Luckily, the odds of humans being infected with Giardia from dogs are relatively low. This is because there are seven types of this parasite, A through G. Dogs are most commonly infected with types C and D, cats with F, and humans most commonly infected with A and B. Even so, it can happen! So to minimize the risk we recommend washing your hands after handling dog poop and keeping your pet's toys, water, and food bowl clean as a whistle!

How do I prevent my dog and me from getting Giardiasis?

Environmental disinfection and good personal hygiene help prevent accidental spread to humans and other pets if your dog is diagnosed with giardiasis. In particular, people with immunodeficiency, such as AIDS or cancer, or who are undergoing chemotherapy, should exercise extreme care, especially when handling feces or after administering medications.

If you are looking to avoid the parasite, the first thing to do is take your dog to your veterinarian of choice to test and make sure your pet isn't infected. After you are sure Giardia is not an existing problem, good hygiene and easy precautions can help you a lot. Bring water (and a dish) for your dog whenever you are going for long walks. Always wash your hands as soon as possible after handling your dog's stool. Keep their food and water dishes clean, as well as toys and accessories. Remember to do stool tests on your furry friend at least annually.

This article provides a summary view of some aspects you need to know about pets and how to protect them from giardia infections. We recommend you take the time to talk in detail with one of our licensed veterinarians. They will provide the best suggestions and strategies for your pet. For an appointment please contact us at (416) 966-1830.

References

  • Anna Burke, "The Facts You Need to Know About Giardia in Dogs".American Kennel Club [source]
  • Ernest Ward, DVM, "Giardia in Dogs". VCA Hospitals [source]
  • Cascade Heights Veterinary Center. "Have Questions about Giardia?" [source]
6 Key Facts About Giardia (2024)

FAQs

What are some important facts about Giardia? ›

Giardia infection (giardiasis) is one of the most common causes of waterborne disease in the United States. The parasites are found in backcountry streams and lakes but also in public water supplies, swimming pools, whirlpool spas and wells. Giardia infection can be spread through food and person-to-person contact.

What makes Giardia unique? ›

Waterborne Zoonotic Parasites

Giardia has a very simple intracellular organization, with no mitochondria or peroxisomes but does have a primitive vesicular secretory system that has been proposed as the archetype of the Golgi secretory apparatus in higher organisms (Marti et al., 2003a,b).

How long can Giardia last? ›

Symptoms usually begin 1 to 2 weeks after becoming infected with Giardia and last for 2 to 6 weeks. Occasionally, people have long-term symptoms that can last for years.

What kills Giardia in humans? ›

Metronidazole is the most commonly used antibiotic for giardia infection. Side effects may include nausea and a metallic taste in the mouth. Don't drink alcohol while taking this medication. Tinidazole (Tindamax).

What does Giardia live off of? ›

The Giardia cyst lives within microscopic traces of poop within your environment that are too small to see. These traces can linger on surfaces, in bodies of water and on people's hands if they don't wash them well enough after using the bathroom. They can also transfer to people's food and drinking water.

What organ does Giardia affect? ›

Giardia, or giardiasis, is a parasitic infection of the small intestine. A tiny parasite called Giardia lamblia causes it.

How big does Giardia get? ›

Giardia duodenalis cysts are oval to ellipsoid and measure 8-19 µm (average 10-14 µm). Mature cysts have 4 nuclei, while immature cysts have two. Nuclei and fibrils are visible in both iodine-stained wet mounts and trichrome-stained smears.

What color is Giardia poop? ›

It Can Cause Digestive Issues

The most common symptom of an active giardia infection is watery diarrhea. The diarrhea may be greenish or yellow in color, or it might be brown, but it is always going to be liquid. There may sometimes be blood present in a dog's stool as a result of giardia as well.

What animal does Giardia affect? ›

It causes diarrhea in a wide variety of species. What animals get giardiasis? Giardiasis infection occurs in a wide variety of domestic and wild mammal species including dogs, cats, cattle, sheep, goats, horses, pigs, beavers, coyotes, non-human primates, rodents, and raccoons.

Can Giardia affect the brain? ›

Diarrhea caused by Giardia sp. or Cryptosporidium sp. has frequently been associated with stunting and lower cognitive function[40,68] (Table ​

Can the body rid itself of Giardia? ›

Signs and Symptoms

They include: Abdominal cramps, diarrhea, increased gas, bloating, fatigue, and sometimes weight loss due to nausea and loss of appetite. These symptoms last for several days only and the body can naturally rid itself of the parasite in one to two months.

Is Giardia a big deal? ›

Giardiasis can be a significant cause of illness, especially diarrhea, in animals and people. However, most dogs infected with Giardia do not have diarrhea, vomiting, or any other signs of illness.

Why is Giardia so hard to treat? ›

Thus, drug resistance in Giardia is the ability of this parasite to survive in the presence of an antimicrobial drug dose that would normally kill it or limit its growth.

What weather kills Giardia? ›

Giardia cysts are killed in the environment by freezing temperatures and by direct sunlight. If neither of these are practical for the area to be disinfected, a chemical disinfectant will be needed.

How to starve Giardia? ›

This can best be achieved by consuming a whole-food based, high-fiber, diet that is low in fat, lactose, and refined sugars. Additionally, ingestion of probiotics and wheat germ assists in parasite clearance. Numerous medicinal herbs show promise in the treatment of giardiasis.

What is the significance of giardiasis? ›

Giardiasis constitutes a significant cause of epidemic diarrhea among children in the developing world, with prevalence rates reaching 15% to 20% in those under 10 years.

What kills Giardia in the environment? ›

Cleaning. Common household disinfectants and steam-cleaning are the most effective ways for killing Giardia cysts. Remove and dispose of all feces promptly. Giardia cysts on the lawn can only be killed by direct sunlight drying them.

Does Giardia lay eggs? ›

As a protozoan parasite, Giardia does not produce eggs; instead, it has two forms. Trophozoites are the flagellate, vegetative stage that live in the intestines of infected dogs, and cysts are trophozoites protected by an outer cell that are shed in the dog's stool.

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