01/08/2026
🐖 CLASSICAL SWINE FEVER (CSF) – A DEADLY THREAT TO PIG PRODUCTION
Classical Swine Fever (CSF), also known as Hog Cholera, is one of the most contagious viral diseases affecting domestic pigs and wild boar. It spreads rapidly through a herd, causing high sickness rates, heavy mortality, severe production losses, and major economic consequences. Although it is a devastating disease for pigs, it does NOT infect humans and pork from infected pigs does not transmit the virus to people.
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Understanding how this disease spreads and recognizing its early signs can help farmers protect their herds and reduce devastating losses.
🦠 Cause
Classical Swine Fever is caused by the Classical Swine Fever Virus (CSFV), a Pestivirus belonging to the Flaviviridae family. The virus attacks the pig's immune system and blood vessels, leading to widespread hemorrhages and organ damage.
🔬 Pathogenesis (How the Disease Develops)
After entering the pig through the mouth, nose, or eyes, the virus first multiplies in the tonsils and nearby lymphoid tissues. It then enters the bloodstream (viremia) and spreads throughout the body.
The virus targets:
- Lymph nodes
- Spleen
- Bone marrow
- Kidneys
- Liver
- Lungs
- Intestinal tissues
As the infection progresses:
- Blood vessel walls become damaged, causing widespread bleeding.
- White blood cells are destroyed, weakening the immune system.
- Secondary bacterial infections become common.
- Severe cases develop multiple organ failure, shock, and death.
Young piglets and pregnant sows are particularly vulnerable.
📌 How the Virus Spreads
CSF spreads very easily through:
✅ Direct contact with infected pigs.
✅ Movement of infected pigs between farms.
✅ Contaminated clothing, boots, vehicles, equipment, and feeding utensils.
✅ Contaminated feed and water.
✅ Feeding uncooked pork scraps or untreated swill.
✅ Semen from infected breeding boars.
✅ Wild boars carrying the virus.
✅ Pregnant sows transmitting the virus to unborn piglets.
The virus can survive for long periods in chilled, frozen, smoked, or cured pork products, making illegal movement of pork products a significant risk.
⚠️ Clinical Signs
Acute Disease
Farmers may observe:
- High fever (40.5–42°C)
- Sudden loss of appetite
- Depression and weakness
- Reluctance to move
- Red or purple discoloration of the ears, abdomen, and legs
- Red eyes (conjunctivitis)
- Constipation followed by severe diarrhea
- Vomiting (occasionally)
- Difficulty walking
- Staggering gait
- Tremors
- Convulsions
- Skin hemorrhages
- Sudden deaths
Mortality can reach 90–100% in severe outbreaks.
Chronic Disease
Less severe infections may cause:
- Intermittent fever
- Poor growth
- Weight loss
- Persistent diarrhea
- Rough hair coat
- Chronic cough
- Recurrent bacterial infections
- Progressive weakness
- Death after several weeks.
Infection in Pregnant Sows
Pregnant animals may experience:
- Abortions
- Stillbirths
- Mummified fetuses
- Weak piglets
- Piglets born persistently infected, which continue shedding the virus and infecting others.
🔍 Postmortem Findings
Veterinarians commonly observe:
- Enlarged hemorrhagic lymph nodes
- Tiny hemorrhages in the kidneys ("turkey egg kidney")
- Enlarged spleen with infarcts along its edges
- Hemorrhages in the urinary bladder
- "Button ulcers" in the large intestine (especially chronic cases)
- Congested lungs
- Widespread internal bleeding
🧪 Diagnosis
Because Classical Swine Fever closely resembles African Swine Fever (ASF), laboratory confirmation is essential.
Diagnostic tests include:
- PCR
- ELISA
- Virus isolation
- Fluorescent antibody testing
Never rely on clinical signs alone to distinguish CSF from ASF.
💊 Treatment
Unfortunately, there is no specific cure for Classical Swine Fever.
Supportive treatment may include:
- Fluid therapy
- Electrolytes
- Vitamins
- Good nutrition
- Broad-spectrum antibiotics to control secondary bacterial infections (these do not kill the virus)
In many countries, infected pigs are humanely culled to stop the disease from spreading.
🛡️ Prevention and Control
The best protection is strong biosecurity:
✅ Buy pigs only from trusted, disease-free farms.
✅ Quarantine new pigs for at least 30 days.
✅ Never feed untreated swill or raw pork scraps.
✅ Restrict unnecessary visitors.
✅ Disinfect boots, equipment, vehicles, and housing regularly.
✅ Prevent contact with wild pigs.
✅ Isolate sick animals immediately.
✅ Vaccinate where vaccination is approved and recommended by veterinary authorities.
✅ Report any suspected outbreak immediately to your local veterinary officer.
📈 Economic Importance
Classical Swine Fever can result in:
- Massive pig deaths
- Reduced fertility and productivity
- High treatment and control costs
- Trade restrictions
- Farm quarantines
- Significant financial losses to pig farmers and the pork industry
📢 Farmer's Take-Home Message
Classical Swine Fever is a highly contagious disease with no specific cure, but it is largely preventable through strict biosecurity, early detection, responsible animal movement, and vaccination where permitted. Prompt reporting of suspected cases is essential to protect your farm and neighboring pig producers.
🐖 Healthy pigs begin with good biosecurity. Prevention is always more effective and less costly than dealing with an outbreak.
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