Coyote giardiasis
Giardiasis is an infection of the intestine caused by a small microscopic parasite called Giardia. This parasite lives in the small intestine of the coyote and disrupts the absorption of food.\nIn wild coyotes, the infection often goes unno...
What is it?
Giardiasis is an infection of the intestine caused by a small microscopic parasite called Giardia. This parasite lives in the small intestine of the coyote and disrupts the absorption of food.\nIn wild coyotes, the infection often goes unnoticed, but it can weaken young animals or those already weakened by other diseases.\nThis parasite affects many mammals, including dogs, and can in certain cases be transmitted to humans.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
The main sign is diarrhea, often soft and sometimes oily or foul-smelling, which can last several days or come back in episodes.\nThe animal may lose weight gradually, appear tired and have dull coat.\nVomiting and a bloated stomach are sometimes observed.\nMany coyotes carrying the parasite show no visible symptoms, especially healthy adults.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The disease is caused by a protozoan (single-celled parasite) called Giardia duodenalis (also called Giardia intestinalis or lamblia). It exists in the intestine in two forms: an active form which attaches to the intestinal wall, and a very resistant cystic form, eliminated in the stools, capable of surviving for a long time in the environment, particularly in water and moist soil.
Young coyotes (cubs) are more vulnerable because their immune system is still immature.\nPromiscuity around water points shared by several animals increases the risk of contamination.\nSignificant stress, a poor diet or a parallel infection (other parasites, diseases) favor the appearance of symptoms.\nMoist environments and areas where water stagnates are conducive to the survival of the parasite.
Transmission
Contamination occurs orally, by ingesting cysts present in water, soil, or food contaminated by infected stools. Direct contact with the feces of an infected animal, or licking the soiled coat, can also transmit the parasite. The cysts resist well in the environment, especially in stagnant water points frequented by wildlife.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian looks for the parasite by examining the stool under a microscope, sometimes supplemented by more sensitive immunological tests capable of detecting specific proteins of the parasite. Because the removal of cysts in the stool is irregular, multiple samples may be needed to confirm the diagnosis.
Treatment
Treatment is based on specific antiparasitic medications, prescribed only by a veterinarian. Digestive support and rehydration may be combined in cases of severe diarrhea. Environmental cleaning is essential to avoid reinfection.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
In a wild animal, direct prevention is difficult to implement.\nIn the context of captive wildlife, in shelters or care centers, good environmental hygiene, regular cleaning of soiled areas and access to clean water limit the spread of the parasite.\nAvoiding overpopulation and stress in enclosures also helps reduce the risk of symptomatic infections.
Possible complications
In a weakened or very young animal, prolonged diarrhea can lead to marked dehydration and stunted growth. In rare cases, the infection promotes longer-term nutrient malabsorption.
When to see a veterinarian
Persistent or recurrent diarrhea for several days\nVisible weight loss or progressive weight loss\nSigns of dehydration (marked lethargy, weakness)\nYoung animal showing several associated digestive symptoms
Transmission to humans
Some strains of Giardia can infect humans, particularly through contact with water or an environment contaminated with feces from carrier animals. Compliance with basic hygiene rules (hand washing, treated drinking water) reduces this risk.
Prognosis
The prognosis is generally good in healthy adult animals, with the infection often remaining silent. In young people or weakened individuals, rapid treatment clearly improves the outcome.
Frequently asked questions
Is a coyote infected with Giardia always sick?
No. Many coyotes carrying the parasite show no visible symptoms, especially if they are adults and healthy.
Can coyote giardiasis infect my dog?
This is possible if the dog comes into contact with water or soil soiled with infected coyote feces. A veterinarian may advise monitoring or testing if contact is suspected.
How do you confirm giardiasis in a wild animal?
By laboratory analysis of stools, looking for parasite cysts under a microscope or by more sensitive tests. Several samples are sometimes necessary.
Is giardiasis dangerous for humans?
It can cause digestive problems in humans, but generally remains benign in a healthy person. Good hand and water hygiene limits the risk.
References
CDC — Centers for Disease Control and Prevention
ESCCAP — European Scientific Counsel Companion Animal Parasites
WOAH — Organisation mondiale de la santé animale (ex-OIE)
Content reviewed by the TunisieVet editorial team · Updated 21 September 2026
Comments (0)
No comments yet.
AT A GLANCE
Need a veterinarian?
Find a practitioner near you on TunisieVet, with their specialities, hours and contact details.
Find a veterinarianCategories
Affected species
This information is provided for educational purposes only and is not a substitute for a veterinary consultation. If you have any concerns about your animal's health, consult a veterinarian.
Thinking of welcoming a pet? Dogs and cats are waiting for a family in Tunisia, and adoption is completely free.
Adoption listingsTo discover
Related diseases and linked Animalia content.
Canine parvovirus
Viral · Vaccine available
Canine distemper
Viral · Vaccine available
Canine leishmaniasis
Parasitic
Rabies
Viral · Vaccine available
TunisieVet in your pocket 📱🐾 Access your veterinary services wherever you are. [ Download the app ]
Learn more