What are the clinical features and recommended treatment for swine fever (including classical swine fever and African swine fever)?

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Last updated: September 16, 2026 • View editorial policy

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Swine fever (Classical Swine Fever [CSF] and African Swine Fever [ASF]) — key features and what to do

  • Bold recommendation: Suspect CSF/ASF in any pig herd with acute high fever, hemorrhages, cyanosis, high mortality, abortions, or sudden deaths; immediately isolate, stop movements, notify authorities, and implement stamping-out and high-level biosecurity—there is no curative treatment; CSF control uses vaccination where permitted, ASF has no licensed vaccine. 1, 2, 3, 4, 5

1) Clinical features to recognize (prioritize rapid detection to reduce mortality/QOL loss of herd)

  • Shared red flags (both CSF and ASF)
    • Peracute deaths; high fever; marked depression/anorexia
    • Cutaneous cyanosis, multifocal skin hemorrhages, ears/tail extremity discoloration
    • Hemorrhagic diarrhea or constipation, vomiting, dyspnea/cough
    • Abortions, stillbirths; weak piglets
    • Petechiae/ecchymoses on serosae, lymph nodes, kidneys; splenomegaly at necropsy
    • Mortality can be very high, especially with virulent strains 1, 2, 5
  • CSF nuances
    • Caused by Pestivirus (Flaviviridae); presentations range from peracute fatal to chronic/subclinical depending on strain/age; can mimic ASF and other syndromes (PRRS, PDNS) 5, 6
  • ASF nuances
    • Caused by Asfarviridae DNA virus; severe hemorrhagic disease with strong immunosuppression; no effective treatment or licensed vaccine; extremely high herd impact and spread risk 2, 1

2) Immediate action algorithm (first contact to containment)

  • If ANY compatible signs:
    1. Stop all animal/products/equipment movements; lock down premises.
    2. Isolate sick from apparently healthy pigs; separate caretakers if possible.
    3. Contact veterinary authorities at once (notifiable transboundary diseases).
    4. Start strict biosecurity:
      • Dedicated clothing/boots, N95/respiratory protection for dusty work, gloves; on-site laundering; no workwear off-site; thorough hand hygiene 7.
      • Controlled access; negative-pressure or directional flow in animal areas if feasible; disinfect entry/exit points 7.
      • Clean organic matter; then disinfect with effective agents (e.g., 1% Virkon S, 1:100 bleach; consider ozone/ozonized water for surfaces/water systems where validated for ASFV) 7, 8.
    5. Coordinate sampling for confirmatory testing (PCR on blood/tissues; authorities guide). Consider rapid sequencing for strain tracing when available to aid control decisions 9.

3) Definite management (to minimize mortality/economic/QOL loss at population level)

  • ASF
    • No treatment; no licensed vaccine. Control relies on quarantine, stamping-out, safe carcass disposal (incineration/burial per regulation), and rigorous biosecurity to stop spread 1, 2.
  • CSF
    • No antiviral treatment; control by rapid detection, movement control, and stamping-out in CSF-free regions; vaccination used in endemic settings or as emergency tool where regulations allow (live attenuated and DIVA/marker vaccines available/authorized in some jurisdictions) 3, 4, 5.
    • Carcass disposal: incineration/burial; decontaminate facilities and equipment thoroughly 3, 5.

4) Diagnostics (to differentiate CSF vs ASF quickly)

  • Lab confirmation is essential due to overlapping signs:
    • PCR/virus detection from blood, tissues (spleen, lymph node, tonsil) distinguishes ASFV vs CSFV; serology for CSF in some contexts. New targeted whole-genome sequencing panels can speed genotype/traceback during outbreaks 9, 5, 3.
  • Do not rely on clinical signs alone; manage as “suspect ASF/CSF” until ruled out to avoid spread and excess mortality 5, 3.

5) Biosecurity and disinfection essentials (prevention and post-outbreak clean-up)

  • Personnel controls: showers-in/out, on-site laundering, no outside use of work footwear; PPE including gloves, protective clothing, and respiratory protection for high-risk tasks; limit access to essential staff; training and SOPs mandatory 7.
  • Environmental controls: remove organic matter before disinfection; effective agents include quaternary ammonium compounds, 70% ethanol (less practical due to evaporation), vapor-phase hydrogen peroxide; for farm contexts, bleach 1:100 and 1% Virkon S achieve high inactivation; ozone/ozonized water shows rapid ASFV inactivation on surfaces/water but requires correct concentration, humidity, and contact time 7, 8.
  • Carcass and waste: prompt removal; incineration or regulated burial/composting; follow local environmental regulations 7, 3, 5.

6) Vaccination policy (decision points)

  • ASF: none available—do not vaccinate; rely on stamping-out and biosecurity 1, 2.
  • CSF:
    • CSF-free areas: typically non-vaccination plus stamping-out during outbreaks to protect trade status, unless emergency vaccination is authorized by authorities 3.
    • Endemic/re-emerging areas: routine vaccination (live attenuated) reduces morbidity/mortality; DIVA/marker vaccines and companion tests can support “vaccinate-to-live” strategies where approved, recognizing current limitations in discriminatory test performance and implementation 3, 4, 6.

7) Common pitfalls and how to avoid them

  • Pitfall: Delayed reporting while “waiting for labs.” Avoid—treat as notifiable immediately to prevent exponential spread and deaths 1, 3.
  • Pitfall: Assuming antibiotics or supportive meds will control the outbreak. They won’t; focus on containment and official control measures 1, 3, 4.
  • Pitfall: Inadequate cleaning before disinfection—organic matter inactivates disinfectants. Always remove debris first 7.
  • Pitfall: Confusing CSF with ASF clinically and loosening controls if one test is negative. Maintain full controls until definitive differentiation and clearance by authorities 5, 3.

8) Bottom line for outcome (morbidity, mortality, QOL of herd and region)

  • Rapid isolation, movement standstill, official notification, stamping-out, and stringent biosecurity are the only measures that reliably cut mortality and protect herd and regional swine industry QOL; CSF vaccination is a powerful adjunct where allowed; ASF currently has no vaccine or treatment, making speed and biosecurity paramount 1, 2, 3, 4, 5.

References

1
Research

Emergence and Control of African Swine Fever.

Pathogens (Basel, Switzerland), 2025

2
Research

African Swine Fever Virus Immunosuppression and Virulence-Related Gene.

Current issues in molecular biology, 2024

6
Research

Clinical signs and epidemiology of classical swine fever: a review of new knowledge.

Veterinary journal (London, England : 1997), 2003

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.