Classical swine fever
Classical swine fever (CSF) is a serious viral disease that affects swine, i.e. domestic pigs, and their wild cousins such as the warthog.\n\nIt is caused by a highly contagious pestivirus that spreads quickly between animals. In warthogs...
What is it?
Classical swine fever (CSF) is a serious viral disease that affects swine, i.e. domestic pigs, and their wild cousins such as the warthog.\n\nIt is caused by a highly contagious pestivirus that spreads quickly between animals. In warthogs, the disease can go unnoticed or cause discreet signs, this species being sometimes more resistant than domestic pigs, but it can also play a role as a silent reservoir of the virus in nature.\n\nThis disease is closely monitored on a global scale because it has an enormous economic impact on pig farming when it circulates between wildlife and farms.
Key point
Notifiable disease in many countries due to its strong impact on animal health and the economy of pig farming.
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 warthogs, the infection is often discreet or even silent, unlike domestic pigs where it is often devastating.\n\nWhen signs appear, we may observe fever, marked depression, loss of appetite, digestive problems such as diarrhea or vomiting.\n\nRedness or spots on the skin, tremors, staggering gait or convulsions may occur in more severe forms.\n\nAbortions are possible in pregnant females. In some cases, death can occur suddenly without obvious prior signs.
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 a virus of the Flaviviridae family, of the pestivirus genus, called the Classical swine fever virus.\n\nThis virus only infects swine (pigs, wild boars, warthogs) and multiplies in the body, attacking in particular the blood vessels and the immune system.
Areas where domestic pig farms and populations of warthogs or wild boars coexist present an increased risk of cross-transmission.\n\nThe lack of biosecurity on farms, the uncontrolled movements of animals and pork products, as well as the high density of animal populations favor the spread.
Transmission
The virus is transmitted by direct contact between infected and healthy animals, by secretions (saliva, urine, feces), by respiratory route over short distances, and by ingestion of contaminated food.\n\nContact between wild warthogs and domestic pigs, or the consumption of contaminated food remains, are important routes of spread between wildlife and farms.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
Diagnosis is based on specialized laboratory tests, as clinical signs alone cannot confirm the disease.\n\nBlood or organ samples are sent to an official veterinary laboratory to test for the virus or antibodies. As this disease is notifiable in many countries, its confirmation involves the health authorities.
Treatment
There is no specific antiviral treatment against Classical swine fever.\n\nTreatment in domestic farms is based on strict health measures: isolation, stamping out of affected animals and their contacts according to regulations, and disinfection of the premises.\n\nIn wildlife, no individual therapeutic intervention is possible; management is done at the population level with surveillance and control measures.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention is based on monitoring wild populations, limiting contact between warthogs and domestic livestock, and strict biosecurity measures.\n\nVaccination exists for domestic pigs in certain countries where the disease is present, but its use in wild animals such as warthogs remains exceptional and supervised by veterinary authorities.\n\nRapid reporting of any abnormal mortality in wildlife to veterinary services is essential to limit the spread.
Vaccination
A vaccine exists and is used in domestic pigs in certain regions where the disease is circulating. Its use in warthogs and other wild swine is not routinely practiced and remains exceptional, regulated by official health control programs.
Possible complications
Complications include high mortality in young animals, abortions and reduced fertility in females, as well as general weakening favoring other opportunistic infections.\n\nThe warthog's reservoir role can sustain virus circulation and compromise eradication efforts in a region.
When to see a veterinarian
Observation of unusual or clustered mortality in warthogs or pigs in the same area\nSigns of serious illness in a captive animal such as fever, severe depression or convulsions\nKnown or suspected contact between a pig farm and sick wild warthogs\nRepeated abortions in a group of females
Prognosis
The prognosis is variable. In warthogs, the infection can be mild or even asymptomatic in certain cases, which contrasts with the severity observed in domestic pigs.\n\nHowever, when severe clinical signs appear, particularly in young people, the outcome can be fatal. The main challenge for this species remains its potential role as a silent reservoir of the virus.
Frequently asked questions
Can warthogs transmit classical swine fever to humans?
No, this disease only affects swine (pigs, wild boars, warthogs) and is not transmitted to humans.
Does an infected warthog always show symptoms?
Not always. Warthogs can carry the virus without showing visible signs, making monitoring of this species particularly important.
Can you vaccinate a warthog against this disease?
Vaccination exists mainly for domestic pigs. In wild animals such as warthogs, it is not routinely practiced and remains the exclusive responsibility of veterinary authorities in very specific contexts.
What should I do if I find dead warthogs in the wild?
All direct contact should be avoided and the discovery should be promptly reported to the veterinary services or wildlife authorities.
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 14 September 2026
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