Piroplasmosis in the Striped Antelope

What is it?

Piroplasmosis is a parasitic blood disease that affects the striped antelope, an African forest antelope also found in certain wildlife reserves and animal parks in Tunisia. It is caused by tiny parasites called piroplasms (Babesia or Theileria), transmitted through tick bites.

These parasites invade the animal's red blood cells, gradually destroy them, and cause anemia that can sometimes be severe. The disease may remain mild in animals living in their natural habitat with acquired immunity, but can become serious in young animals, stressed animals, or those newly introduced to an enclosure.

In captive animals (zoos, hunting reserves), piroplasmosis is an important cause of illness, especially when tick infestations are heavy.

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 blood parasitic protozoans belonging to the genera Babesia or Theileria (the "piroplasms"). These microorganisms multiply inside red blood cells, which they eventually destroy.

Transmission occurs almost exclusively through bites of infected ticks, which act as vectors by inoculating the parasite during their blood meal. Direct transmission between animals has not been demonstrated outside of this vector.

Young animals, females in late pregnancy or after giving birth, and weakened or stressed animals are more susceptible to severe disease.

Heavy tick infestations, favored by dense vegetation, warm and humid climate, or overcrowding in an enclosure, increase the risk of exposure.

Animals newly introduced into an environment where disease is already present (park, reserve) are particularly vulnerable because they have not developed gradual immunity.

Immune suppression, concurrent illness, or poor body condition also worsen the outlook.

Transmission

Transmission exclusively through bites of infected ticks (vectors). No direct transmission between animals has been demonstrated.

Diagnosis and care

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

Treatment

Treatment relies on specific antiparasitic drugs targeting piroplasms, prescribed and administered only by a veterinarian given their potential toxicity in wild ungulates.

Supportive care is often combined with treatment: fluids to correct dehydration, sometimes blood transfusion in cases of severe anemia, and fever or pain management if needed.

Destruction of ticks present on the animal (acaricide treatment) is an integral part of management to prevent immediate reinfestation.

Prevention

Possible complications

Untreated severe anemia can lead to failure of multiple organs, particularly the kidneys, due to accumulation of pigments from destroyed red blood cells.

Secondary complications such as pneumonia or opportunistic bacterial infection may occur in a weakened animal.

In the most severe forms, the outcome may be fatal, particularly in young animals or those already compromised.

When to see a veterinarian

Prognosis

The outlook depends on how quickly treatment is started and the animal's overall condition. Early intervention, before severe anemia develops, offers good chances of recovery.

Advanced cases with kidney damage or severe anemia carry a more guarded outlook, especially in young animals or those weakened by other diseases.

Animals that have survived a first episode often develop some resistance, though this does not guarantee complete protection against reinfection.

Frequently asked questions

References

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

ESCCAP — European Scientific Counsel Companion Animal Parasites

Content reviewed by the TunisieVet editorial team · Updated 03 September 2026