Kite toxoplasmosis
Toxoplasmosis is a parasitic disease caused by a protozoan, Toxoplasma gondii, capable of infecting a very wide variety of warm-blooded animals, including birds of prey such as the red kite (Milvus milvus) and the black kite (Milvus migrans...
What is it?
Toxoplasmosis is a parasitic disease caused by a protozoan, Toxoplasma gondii, capable of infecting a very wide variety of warm-blooded animals, including birds of prey such as the red kite (Milvus milvus) and the black kite (Milvus migrans). In these raptors, the infection is most often silent, but it can become serious in weakened, injured or immunocompromised birds, particularly young ones in wildlife care centers. This disease is of particular importance in wildlife medicine and public health due to its zoonotic nature.
Key point
Although often asymptomatic, toxoplasmosis can progress to serious and fatal neurological or multiorgan damage in weakened or immunocompromised kites, particularly young people in rescue centers.
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:
In kites, toxoplasmosis very often goes unnoticed. When signs appear, they are varied and not very specific: general depression, weakness, difficulty maintaining flight or perching correctly. Neurological disorders may occur, resulting in a lack of coordination, head tilt, tremors or abnormal movements, or even convulsions in severe forms. The bird may also show loss of appetite, progressive weight loss and abnormal breathing if the lungs are affected. These signs resemble those of many other diseases or poisonings affecting wild raptors, which complicates diagnosis based on clinical examination alone.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Toxoplasmosis is caused by a microscopic parasite called Toxoplasma gondii. This parasite requires a cat (domestic or wild) to complete its full reproductive cycle; the cat eliminates infectious forms called oocysts in its stools. These oocysts contaminate the environment, water and prey. The kite, a bird of prey that feeds on carrion, small mammals and sometimes already sick or weakened prey, becomes infected by consuming tissues containing the parasite's cysts or by ingesting oocysts present in the environment.
Young kites and birds already weakened by injury, poisoning or other illness are more likely to develop a serious clinical form. The significant presence of stray or domestic cats in the hunting or nesting environment increases the risk of contamination of the environment. Consumption of carrion or small rodents carrying parasitic cysts is a frequent route of contamination for this scavenging raptor and opportunistic predator. The stress linked to captivity in a care center can also promote the reactivation of the parasite in a latent carrier bird.
Transmission
The kite is mainly contaminated by ingesting Toxoplasma gondii cysts present in the tissues of infected prey or carrion, or by ingesting oocysts disseminated in the environment by the feces of infected cats. There is no documented direct transmission from one kite to another kite or to other animal species through simple contact. Transmission to humans occurs via the environment (ingestion of oocysts) or food, not through contact with the bird itself.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The diagnosis of toxoplasmosis in a kite is difficult because the clinical signs are not specific. The wildlife veterinarian relies on the history of the bird (found weakened, unable to fly), a complete clinical examination, and blood tests to look for antibodies or assess the general condition of the organism. In certain cases, a direct search for the parasite can be carried out on samples. The definitive diagnosis is often based on post-mortem examination when the bird has not survived, with the observation of characteristic lesions in the brain, heart, liver or lungs.
Treatment
The treatment, reserved for wildlife care structures, combines specific antiparasitic molecules active against protozoa, often combined with each other, as well as supportive care: rehydration, nutritional assistance, pain management and rest in a calm and secure environment. Regular veterinary monitoring is essential to adapt treatment to the bird's progress.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention in wild kites is difficult to implement directly. In wildlife care centers, it is based on good hygiene of enclosures, limiting the access of stray cats to bird convalescence areas, and controlled feeding (uncontaminated prey) for birds undergoing rehabilitation. Managing stray cat populations in the natural environment can also help reduce overall parasitic pressure on wildlife.
Possible complications
In kites, the infection can remain silent for life if the immune system controls the parasite. But if the bird is weakened (other illness, injury, stress, young age), the parasite can reactivate and cause serious damage to the central nervous system, heart or lungs, sometimes leading to death. An acute generalized infection in a young bird or an already weakened individual can progress quickly and be fatal.
When to see a veterinarian
A kite found on the ground, unable to fly or stand up normally, must be quickly entrusted to a wildlife rescue center or a veterinarian.
Abnormal movements, a tilted head or tremors in a collected bird of prey warrant urgent veterinary advice.
A prolonged loss of appetite and weight loss in a convalescing bird should alert keepers.
Any seizure or severe loss of coordination in a kite in a care center is a veterinary emergency.
Transmission to humans
Toxoplasma gondii is a major zoonotic parasite. Humans are generally not directly contaminated by contact with an infected kite, but the cycle of the parasite in the environment (via cats and contamination of soil, water or food) represents a well-documented risk for public health, particularly for pregnant women and immunocompromised people. Simple hygiene precautions (wearing gloves, washing hands) are recommended when handling any sick wild bird or its droppings.
Prognosis
The prognosis is variable. Many kites carrying the parasite live normally without ever developing clinical disease. On the other hand, when clinical signs appear, particularly neurological, the prognosis becomes guarded to bleak, especially in young birds or those already weakened by another cause (trauma, intoxication, undernutrition). Rapid treatment in a specialized center improves the chances of recovery.
Frequently asked questions
Can a kite sick with toxoplasmosis infect humans?
The kite itself does not directly transmit toxoplasmosis to humans through casual contact. The main risk for humans comes from the ingestion of oocysts present in the environment contaminated by cats, or from the consumption of undercooked meat. Handling a sick bird with gloves and washing your hands remains a reasonable precaution.
Why are cats involved in this kite disease?
The cat is the only animal in which the parasite Toxoplasma gondii can complete its complete reproductive cycle and produce resistant oocysts in the environment. The kite becomes contaminated by ingesting these oocysts via water, soil or contaminated prey, or by directly eating infected tissues of other animals.
Do all infected kites get sick?
No. The majority of kites carrying the parasite never develop visible clinical signs. The disease generally only occurs when the bird is otherwise weakened, stressed, very young, or suffers from another pathology that lowers its immune defenses.
Is there an effective treatment for an affected kite?
A specific antiparasitic treatment can be administered by a veterinarian in a wildlife care center, combined with supportive care. The prognosis depends greatly on the precocity of treatment and the general condition of the bird at the time of diagnosis.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
CDC — Centers for Disease Control and Prevention
ESCCAP — European Scientific Counsel Companion Animal Parasites
Content reviewed by the TunisieVet editorial team · Updated 29 September 2026
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