Piroplasmosis in Dorcas Gazelle
Piroplasmosis is a blood parasitic disease caused by tiny parasites called piroplasms (genera Babesia or Theileria depending on the region). These parasites are transmitted through tick bites and destroy red blood cells in infected animals....
What is it?
Piroplasmosis is a blood parasitic disease caused by tiny parasites called piroplasms (genera Babesia or Theileria depending on the region). These parasites are transmitted through tick bites and destroy red blood cells in infected animals.
In dorcas gazelles, this disease can affect both animals living in their natural habitat and those kept in captivity in zoos or wildlife reserves, particularly in North Africa and the Middle East where the species is found.
The severity of the disease varies depending on the animal's age, general health status, and the type of parasite involved.
Key point
Peracute forms can progress rapidly to death without treatment, particularly in young gazelles or animals already weakened.
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:
Clinical signs appear after an incubation period that varies, most often from a few days to two weeks after an infected tick bite.
Fever, marked lethargy, and loss of appetite are typically observed.
Destruction of red blood cells leads to anemia, which shows as pale mucous membranes, particularly visible in the gums.
In more advanced cases, yellowish discoloration of the mucous membranes (icterus) may develop, along with dark-colored urine.
The animal may also show significant fatigue, progressive weight loss, and sometimes faster or labored breathing in cases of severe anemia.
Some animals, particularly young or weakened individuals, may develop a peracute form with very rapid progression.
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 intra-erythrocytic parasitic protozoans (parasites that live inside red blood cells), mainly species of the genera Babesia and Theileria.
These parasites are transmitted by hard ticks which, while feeding on the animal's blood, inject the parasite into the bloodstream.
Once in the body, piroplasms invade red blood cells, multiply within them, and then burst the cells, causing anemia.
Dorcas gazelles living in areas heavily infested with ticks are most at risk.
Young animals, weakened subjects, those under stress, or carriers of other diseases are more likely to develop severe disease.
Stress from captivity, transport, or environmental change can trigger clinical signs in an animal silently carrying the parasite.
Warm and humid seasons, which favour tick proliferation, increase the risk of transmission.
Transmission
Transmission occurs exclusively through bites from infected ticks. There is no direct transmission between animals without passage through this vector. Vertical transmission (from mother to fetus during pregnancy) has been documented in certain animal species infected with this type of parasite.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian suspects piroplasmosis when clinical signs appear, particularly anaemia associated with fever in an animal exposed to ticks.
Confirm diagnosis rests on microscopic examination of a blood smear, which allows visualisation of the parasite inside red blood cells.
Additional tests such as serology or molecular biology techniques (PCR) can be used to confirm diagnosis and precisely identify the parasite species involved.
A complete blood count evaluates the degree of anaemia and its effects.
Treatment
Treatment relies on administration of specific antiparasitic medications active against piroplasms, prescribed and given only by a veterinarian due to their narrow therapeutic window in wild species.
Supportive care often accompanies this: fluid therapy to combat dehydration, and in severe anaemia cases, blood transfusion may be considered.
Tick control on the animal is an integral part of management.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Tick control is the primary prevention measure: regular external antiparasitic treatments, frequent coat inspection, and environmental management to reduce tick populations (clearing vegetation, paddock management).
In captive facilities, quarantine and examination of new animals before introduction help prevent the arrival of infected ticks.
Regular veterinary monitoring of captive or semi-captive populations is recommended in endemic areas.
Possible complications
Untreated severe anaemia can lead to multiorgan failure, particularly kidney damage related to massive haemoglobin release into the bloodstream.
Liver complications may also occur.
In the most fragile animals, the course can be fatal, particularly without prompt treatment.
When to see a veterinarian
Fever associated with unusual lethargy in a dorcas gazelle
Pale mucous membranes (gums, conjunctivae) noticed by a caregiver
Yellowish discoloration of the eyes or mucous membranes
Abnormally dark urine
Persistent refusal to eat
Presence of numerous ticks on the animal combined with signs of fatigue
Prognosis
The prognosis depends on how early the diagnosis is made and how quickly treatment is started.
It is generally favorable if care is prompt, before severe anemia develops.
The prognosis becomes guarded to poor in peracute forms or when treatment is delayed, particularly in young animals or already weakened individuals.
Frequently asked questions
Can piroplasmosis in gazelles be transmitted to humans?
No, piroplasmosis affecting gazelles is not considered transmissible to humans. The risk for caregivers comes rather from other agents that ticks can transmit.
How does a gazelle catch this disease?
Only through the bite of a tick carrying the parasite. There is no direct contamination between gazelles.
Can a healed gazelle remain a carrier of the parasite?
Yes, as in other species, an animal that has overcome the infection can remain a carrier of the parasite without visible signs, and stress can sometimes cause the disease to reappear.
How can you protect a group of gazelles in captivity against this disease?
The most effective measure is tick control: regular antiparasitic treatments, environmental management, and veterinary monitoring of new arrivals.
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 02 September 2026
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