Marten coccidiosis

What is it?

Coccidiosis is an intestinal parasitic disease caused by tiny single-celled parasites called coccidia, mostly belonging to the genus Eimeria or Isospora. These parasites invade the cells that line the inside of the marten's intestine. They multiply there and eventually destroy them, which disrupts digestion and absorption of food. The disease mainly affects young martens, in whom it can be more severe, but adults can also be carriers without necessarily showing visible signs.

Commonly observed signs

These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.

Causes and risk factors

The disease is caused by protozoa of the genus Eimeria or Isospora, microscopic parasites specific to the intestine. These organisms multiply in intestinal cells, producing resistant forms called oocysts, which are then shed in the stool and can contaminate the environment.

Young, recently weaned martens are the most vulnerable, as their immune systems are not yet mature. Stress, a crowded or unsanitary environment, an unbalanced diet and the presence of other diseases weakening the body favor the appearance of clinical signs. Captivity or proximity to other wild or domestic carnivores in the same space also increases the risk of contamination.

Transmission

Contamination occurs mainly through the oral route, when the marten ingests oocysts present in the environment, on prey, in water or on food soiled by infected feces. Young animals living in groups or in confined environments (such as in care centers or in captivity) are more exposed due to the concentration of oocysts in their immediate environment.

Diagnosis and care

Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.

Treatment

Treatment is based on antiparasitic molecules specific to coccidia, prescribed only by a veterinarian depending on the severity of the case. Rehydration support and appropriate nutrition often accompany treatment to help the animal recover.

Prevention

Possible complications

In the absence of treatment, severe dehydration can set in, endangering the life of the animal, particularly in young individuals. Significant intestinal damage can also promote secondary infections, worsening the prognosis.

When to see a veterinarian

Prognosis

The prognosis is generally favorable in healthy adults and treated quickly. It remains more reserved in young, weakened animals or in the event of a delay in treatment, where complications may appear.

Frequently asked questions

References

ESCCAP — European Scientific Counsel Companion Animal Parasites

WOAH — Organisation mondiale de la santé animale (ex-OIE)

Content reviewed by the TunisieVet editorial team · Updated 19 September 2026