What is Giardia? (2024)

Summary: Giardia can end up being an important issue if you do not understand what you are dealing with, that’s why Dr. Barrientos has taken the time to answer the six most important questions about this parasite.

WHAT IS GIARDIA?

Giardia is an extremely common digestive tract parasite. It’s important to know that it is not a virus, bacteria or a worm, it’s a unicellular protozoan parasite. It resides in the intestines of cats and dogs, it can also affect human beings and trigger intestinal upset, vomiting and diarrhea and in the case of dogs, poor growth. The name of the infection caused by this parasite is called Giardiasis.

Giardiasis may be a relevant factor for illnesses, particularly diarrhea, in both animals and humans. However, numerous pets contaminated with Giardia do not get diarrhea, throw up, or show any other signs of the disease.

WHAT OCCURS WHEN GIARDIA GOES UNTREATED?

Some pets can get rather sick. They may show different levels of dehydration, diarrhea and vomiting. Younger dogs in their growth phase may not reach their full growth potential and end up becoming unthrifty. Sometimes you have some pet dogs who have the ability to control Giardia on their own and they don’t look like they are sick. Even so, they may be transferring the Giardia infection to other dogs they encounter in public spaces, so it is essential to test for it by doing a fecal sample and if it comes out positive, start treating it.

WHAT DOES GIARDIA POOP LOOK LIKE IN DOGS?

Generally, dogs with Giardia have softish bowel movements. They range from moderately soft, like melted ice cream all the way to severe diarrhea. That’s one of the most common signs. Even so, you will sometimes have dogs that are infected that have normal stool, this is why testing for Giardia is so important.

HOW IS GIARDIA DIAGNOSED & TREATED?

As mentioned before, Giardia can be easily identified through a stool or fecal sample. Treatment involves medication, the first choice is usually Fenbendazole, if that does not do the job, then we use something called Metronidazole. The parasite can be quite resilient and may require numerous bouts of treatment to effectively remove it. In addition to medication, things like probiotics and a good digestible diet are likewise effective in controlling it. Some dogs may require follow-up testing and treatments based on their condition and the intensity of the infection. All contaminated animals must be re-tested 2 to 4 weeks after finishing the treatment.

CAN I GET GIARDIA IF MY PET LICKS ME?

Thankfully, the chances of humans being contaminated with Giardia from pets is reasonably low. There are seven different variants of this intestinal parasite, they are assigned letters A through G. Canines are most commonly affected by types C and D, felines with F, and humans mostly infected with A and B. Nevertheless, it is still possible! So to reduce the danger we advise thorough hand washing after handling your pet’s poop and also by keeping your dog’s toys, food and water bowl as clean as a whistle!

HOW DO I PREVENT MY PET DOG AND ME FROM GETTING GIARDIASIS?

Good personal hygiene & environmental disinfection will help prevent unintentional spread to people and pets if your dog has giardiasis. People with immunodeficiency, AIDS or cancer, or who are going through chemotherapy, must be very careful, especially when dealing with feces or after administering medications to their pets.

To avoid getting this parasite, the first thing we recommend is to take your pet to the veterinarian to test and make sure they are not infected. Once that’s taken care of, good hygiene and simple precautions can actually help a lot. When you are out on long walks bring your own water along (and a dish) so your dog doesn’t have to share it with other pets. Always clean your hands as soon as possible after managing your pet’s stool. Always keep their water and food dishes clean, and this also includes toys & accessories. It is also important to do stool tests on your dog at least once a year.

Dr. Edison Barrientos

What is Giardia? (2024)

FAQs

What is Giardia in simple terms? ›

Giardiasis is a diarrheal disease caused by the microscopic parasite Giardia duodenalis (or “Giardia” for short). Once a person or animal has been infected with Giardia, the parasite lives in the intestines and is passed in stool (poop).

Is Giardia good or bad? ›

Giardia infection is almost never fatal in industrialized countries. But it can cause lingering symptoms and serious complications, especially in infants and children. The most common complications include: Dehydration.

What can Giardia survive? ›

How long does Giardia survive in the environment?
  • Giardia can survive for several months in cold water or soil.
  • Giardia can survive much longer in soil at colder temperatures than at room temperature.
Feb 26, 2021

Who does Giardia affect the most? ›

Children are at much higher risk for Giardia infection than adults and have higher infection rates. Giardia infection rates tend to rise in late summer in the United States. Travelers to areas with poor sanitation are more likely to get infected with Giardia.

What does Giardia do? ›

Giardiasis (jee-are-DYE-uh-sis) is caused by the tiny Giardia parasite. The parasite attaches itself to the lining of the small intestines in humans, where it causes diarrhea and blocks the body's absorption of fats and carbohydrates from digested foods.

What kills Giardia in humans? ›

Several drugs can be used to treat Giardia infection. Effective treatments include metronidazole, tinidazole, and nitazoxanide. Other medications include paromomycin, quinacrine, and furazolidone. Some of these drugs may not be readily available in the United States.

Does Giardia go away? ›

People with giardiasis will usually feel better and no longer have symptoms within 2 to 6 weeks. However, in some cases, symptoms may seem to be gone but will return after several days or weeks.

Is Giardia bad in humans? ›

People exposed to Giardia may experience mild or severe diarrhea (loose stool/poop), gas, stomach cramps, nausea (a feeling of upset in the stomach), or dehydration (loss of water in the body causing weakness of dizziness). Some people experience no symptoms at all. Fever is rarely present.

What naturally kills Giardia? ›

Thankfully giardia is quite susceptible to many of our herbal antimicrobials including garlic (11), oregano, and guava leaf (12). Many other herbal antimicrobials are helpful, and in most cases natural treatment for Giardia can be effective in as little as two weeks of herbal treatment.

Is Giardia a worm? ›

What is Giardia? Giardiasis is an intestinal infection in humans and animals caused by a microscopic protozoan. It is a simple one-celled parasitic species, not a worm, bacteria, or virus. The parasite occurs worldwide and is a common cause of "Traveler's Diarrhea" in people.

Is Giardia killed by cold? ›

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.

Can Giardia be killed by boiling? ›

Iodine or chlorine added to water will kill Giardia but not Crypto. Boiling water before you use it is the most reliable method to kill Giardia, Crypto and almost any other microscopic organism that can hurt you. If you boil the water for a full three minutes, you will kill any protozoa or viruses the water contains.

What color is Giardia stool? ›

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.

What organs does Giardia affect? ›

Giardia parasites live around the world, in most countries and continents. It tends to be a bigger problem in countries with poor sanitation, such as developing countries. But you can get it almost anywhere. In the United States, giardiasis is the most common parasitic infection to affect the intestines.

Can you have Giardia for years? ›

Long-term complications of giardiasis may present 2 to 3 years following the infection. In some cases, they may last for a few weeks, and may be eliminated with anti-parasitic treatment, observations that have been reported for example in cases of myopathy and skin allergies.

What is Giardia and what problems does it cause? ›

Giardiasis is an intestinal (bowel) illness caused by a microscopic parasite called Giardia. It is a common illness that causes diarrhea (loose stool/poop).

What is Giardia also known as? ›

Giardia duodenalis is a protozoan flagellate (Diplomonadida). This protozoan was initially named Cercomonas intestinalis by Lambl in 1859. It was renamed Giardia lamblia by Stiles in 1915 in honor of Professor A.

Why is Giardia harmful? ›

Over time, giardiasis can also cause weight loss and keep the body from absorbing nutrients it needs, like fat, lactose, vitamin A, and vitamin B12. Some people with Giardia infections have no symptoms at all. People with giardiasis will usually feel better and no longer have symptoms within 2 to 6 weeks.

Is Giardia the same as worms? ›

What is Giardia? Giardiasis is an intestinal infection in humans and animals caused by a microscopic protozoan. It is a simple one-celled parasitic species, not a worm, bacteria, or virus. The parasite occurs worldwide and is a common cause of "Traveler's Diarrhea" in people.

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