Pasteurellosis

Pasteurellosis is a bacterial infectious disease caused mainly by bacteria of the Pasteurella or Mannheimia genus. In Grant's gazelle, as in other African antelopes, this infection can cause severe respiratory damage and sometimes severe se...

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Definition Signs Causes Transmission Diagnosis Treatment Prevention Complications When to see a vet Zoonosis Prognosis FAQ Sources Affected species

What is it?

Key point

Peracute forms of Pasteurellosis can lead to the death of the animal within a few hours, even before the appearance of clearly identifiable symptoms. Close monitoring after any episode of stress is essential.

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:

Fever Difficulty breathing Rapid breathing Runny nose Loss of appetite Reduction Swelling Fatigue Excessive salivation Cough Lying animal that does not get up

Clinical signs often appear suddenly. Fever, marked depression and loss of appetite are observed. Breathing difficulties with rapid breathing and sometimes coughing may occur, accompanied by a runny nose. Swelling of the throat or submandibular region is sometimes visible. In the most serious forms, the animal can be found lying down, unable to get up, with a very rapid progression towards death within a few hours to a few days.

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 of the genus Pasteurella (notably Pasteurella multocida) or Mannheimia haemolytica. These bacteria can occur naturally in the respiratory tract of many animals without causing disease, but become pathogenic when the animal's immunity is weakened.

Stress is the main triggering factor: transport, handling, capture, change of enclosure, difficult climatic conditions (excessive heat, humidity). Overpopulation, unsuitable diet, concomitant parasitic infections or any other disease weakening the immune system increase the risk. Young animals and individuals newly introduced into a group are more vulnerable.

Transmission

Transmission occurs by direct contact between animals, by air (respiratory droplets), or by contamination of the shared environment (water points, litter). Stress linked to transport, capture, sudden climate changes or overpopulation favors the appearance of the disease in animals already carrying the bacteria.

Diagnosis and care

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

The veterinarian relies on the clinical signs observed and the recent history of the animal (stress, transport). The definitive diagnosis requires a bacteriological analysis from respiratory or blood samples, carried out in the laboratory. An autopsy may be necessary in cases of sudden death to confirm the cause.

Treatment

Treatment is based on appropriate antibiotic therapy, prescribed and administered under veterinary supervision. Supportive treatments such as fluid therapy and anti-inflammatories may be combined depending on the animal's condition. The speed of implementation of treatment is decisive for the prognosis.

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: gentle handling, well-organized transport, quarantine of new arrivals, appropriate population density. Good hygiene of enclosures and water points limits the environmental bacterial load. A balanced diet and regular parasite monitoring strengthen the animal's natural defenses.

Possible complications

Without prompt treatment, the infection can progress to widespread sepsis, severe pneumonia or death. Peracute forms can lead to death within a few hours without significant warning signs.

When to see a veterinarian

Any sign of respiratory distress in the gazelle

Fever associated with sudden depression

Visible swelling in the neck or throat

Animal isolated from the group, lying down and unable to get up

Any episode of significant stress (transport, capture) followed by symptoms, even discreet

Transmission to humans

Some species of Pasteurella can occasionally infect humans, usually through bites, scratches or close contact with an infected animal. The risk remains limited but justifies hygiene precautions when handling sick animals or corpses.

Prognosis

The prognosis is poor in the absence of early treatment, as the disease can progress very quickly. With rapid veterinary care, some animals can recover, but peracute forms often remain fatal despite treatment.

Frequently asked questions

Is pasteurellosis contagious between gazelles?

Yes, it can be transmitted by direct contact or via shared environment, especially in cases of promiscuity or stress in the group.

Can we vaccinate gazelles against pasteurellosis?

There is no widely used and validated vaccine for this wildlife species; prevention is mainly based on stress and environmental management.

Can a seemingly healthy gazelle carry the bacteria?

Yes, Pasteurella can be present without visible signs in a healthy animal, and only become problematic in the event of a drop in immunity linked to stress.

How long does the disease last before death if left untreated?

In the most serious forms, the progression can be very rapid, from just a few hours to a few days.