Pasteurellosis of impala
Pasteurellosis of impala is an acute, often devastating bacterial disease that affects this African antelope. It is caused by bacteria of the Pasteurella or Mannheimia genus, normally present without danger in the animal's respiratory tract...
What is it?
Pasteurellosis of impala is an acute, often devastating bacterial disease that affects this African antelope. It is caused by bacteria of the Pasteurella or Mannheimia genus, normally present without danger in the animal's respiratory tract. Under the effect of significant stress, these bacteria multiply abnormally and invade the blood, causing septicemia (generalized infection) which is often fatal within a few hours. This disease is well known in zoos and wildlife reserves, because it typically occurs after capture, transport or a sudden change in environment.
Key point
A potentially devastating illness that can lead to death within a few hours, particularly during episodes of collective stress such as group capture or transport.
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 signs evolve very quickly, sometimes in just a few hours.
The impala becomes despondent, refuses to feed and develops a fever.
Difficult or accelerated breathing appears, sometimes accompanied by coughing or a runny nose.
Swelling of the throat or neck may be visible in some forms of the disease.
In the most serious cases, the animal is found lying down, unable to get up, and then dies quickly, sometimes even before obvious signs are noticed.
The peracute form (very rapid) is common: the animal can be found dead without having shown any apparent signs of illness the day before.
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 bacteria from the Pasteurella/Mannheimia group, which occur naturally in the upper respiratory tract of many wild ruminants without causing problems.
These bacteria become pathogenic when a stressful event weakens the animal's defenses, allowing them to enter the bloodstream and cause widespread infection.
Stress is the main triggering factor: capture, physical restraint, transport, sudden change in temperature, overcrowding in an enclosure, or introduction to a new environment.
Young animals, weakened or recently relocated individuals, as well as those living in captivity or high density conditions are at greater risk.
Extreme climatic conditions (cold, intense rain, excessive heat) can also favor the appearance of the disease.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
A definitive diagnosis is difficult to obtain during the animal's lifetime due to the speed of development.
It is most often based on autopsy, with identification of characteristic lesions (hemorrhages, lung damage) and confirmation by bacteriological culture or laboratory analysis from organ samples.
A veterinarian specializing in wildlife must be involved as soon as suspicion is suspected, particularly in the presence of grouped mortalities after an episode of stress.
Treatment
When the disease is detected early enough, broad-spectrum antibiotic treatment can be started by a veterinarian, combined with supportive care (fluids, anti-inflammatory drugs).
Due to the rapid progression of the septicemic form, the chances of successful treatment remain limited once the clinical signs are well established.
Stress management and isolation of animals at risk are an integral part of care.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention is based above all on reducing stress during handling: limiting the duration of capture and transport, handling animals calmly and quickly, and avoiding too dense groupings.
Gradual acclimatization upon introduction to a new enclosure or reserve is recommended.
Regular health monitoring of the herd makes it possible to quickly identify any weakened animal before a scheduled episode of stress (capture, transport).
There is no widely used and validated vaccine for this pathology in impalas in current practice.
Possible complications
The major complication is the rapid death of the animal, often within a few hours, from septic shock.
Multiple mortalities can occur within the same group after an episode of collective stress such as mass capture or transport.
When to see a veterinarian
A recently captured, transported or moved impala shows despondency or refuses to feed.
Breathing difficulty, cough or runny nose appear in one animal in the group.
An animal remains lying down and can no longer get up.
Several animals in the same group die quickly after a stressful event.
Prognosis
The prognosis is poor, particularly in the peracute form where death occurs very quickly, sometimes before any detectable clinical sign.
Very early diagnosis and intervention improve the chances of survival, but the rapid progression of the disease often limits the possibilities for action.
Frequently asked questions
Can impala pasteurellosis be transmitted to humans?
No, this form of pasteurellosis associated with stress in impala is not considered transmissible to humans under usual conditions.
Why does this disease mainly affect captured or transported animals?
Intense stress weakens the impala's natural defenses, allowing normally harmless bacteria in its airways to multiply and invade the entire body.
Can impalas be vaccinated against this disease?
There is no widely used reference vaccine for this pathology in impala; Prevention is mainly based on reducing stress during handling.
Can an impala die without showing signs of illness?
Yes, in the peracute form of the disease, death can occur very quickly, sometimes without any visible signs having been noticed before.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
FAO — Organisation des Nations unies pour l'alimentation et l'agriculture
Content reviewed by the TunisieVet editorial team · Updated 16 September 2026
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