Global Status of African Swine Fever Outbreaks and Suggested Steps

African Swine Fever (ASF) remains a severe and recurring threat to the global pork industry and pork supply chains. Newly consolidated data released today by the EFSA highlights a massive 76% surge in EU domestic pig outbreaks and a 44% jump in wild boar cases year-over-year.

However, Q1 2026 data shows early signs of a structural shift: active outbreaks in domestic herds are trending downward globally (a 35% decrease compared to Q1 2025), while environmental viral load in wild boar has peaked at its highest level since January 2022. The disease continues to jump geographical boundaries due to wild boar migration and feed/swill contamination vectors.

Regional Breakdown & Hotspots

Europe & The European Union

The European theater is currently a story of wild boar pressure and unexpected geographical leaps.

• The Surge Context: Romania continues to bear the brunt of the burden, accounting for 81% of all domestic pig outbreaks in the EU

• The Spanish Re-emergence: After 31 years of ASF-free status, the disease re-emerged in Spain via wild boar networks. During Q1 2026, Spain confirmed 33 distinct outbreaks in wild boar (primarily across Catalonia and localized municipalities), forcing intensive fencing, active carcass tracking, and strict movement bans across 45 commercial farms inside restricted zones

• Western Movement: EFSA scientists sound the alarm on long-range jumps with unidentified sources, notably a wild boar detection in North Rhine-Westphalia (Germany) located 200 km away from any previously known case

• Q1 2026 Shift: While Poland and Germany noted sharp drops in wild boar cases, massive spikes occurred in Croatia (+986%), Lithuania (+92%), and Italy (+65%)

Asia-Pacific

The Far East remains a volatile zone characterized by high backyard farming exposure and a reliance on risky swill-feeding practices.

• Vietnam: Remains highly active. So far in 2026, 24 separate provinces have reported 261 outbreaks, forcing the destruction of more than 14,700 pigs

• India (Nagaland Update – May 21, 2026): Fresh emergency orders were issued today in the Mon and Medziphema regions of Nagaland following a major localized flare-up. Authorities have enforced an absolute ban on the import, export, and transport of live pigs and a total ban on pork sales across the affected districts

• New Territories: Emerging isolated vectors are causing concern. Papua New Guinea officially logged the spread of the virus to a brand-new zone (East Sepik), wiping out semi-domesticated free-range populations interacting with native wild pigs. Nepal also reported significant backyard culls in its Gandaki province

The Americas & Africa

• Americas: Successfully maintaining a highly defensive barrier. No new cases have breached the U.S. or mainland South American borders, though active surveillance remains deployed in the Caribbean buffer zones.

• Africa: Epidemic stability remains unchanged, with endemic baseline metrics tracking normally across sub-Saharan domestic structures.

Transmission Vectors & Surveillance Data

The global surveillance network processed record volumes of data over the past year—testing over 518,000 domestic pig samples and 618,000 wild boar samples in the EU alone.

• The Passive Surveillance Pivot: EFSA and WOAH scientists confirm that passive surveillance (reporting sick animals or carcasses) accounted for 84% of domestic and 73% of wild boar detections. Regulatory guidance is explicitly telling nations to focus funding on carcass searches rather than random active herd testing

• The Feed Ingredient Risk Factor: Intensive environmental testing has successfully isolated ASF genetic material inside porcine plasma protein-derived feed ingredients and commercial compound feed. Contaminated feed supply chains are now classified as a major, high-risk vector for unexpected transboundary jumps

Vaccine Development & International Policy

• WOAH Regulatory Frameworks: Because some countries have begun deploying uncoordinated or unapproved vaccines, WOAH is currently drafting a strict new set of global guidelines. These guidelines will govern the field evaluation of Genotype II ASF vaccines and mandate strict post-vaccination monitoring protocols to ensure live-vaccine strains do not revert to virulence

• Recombinant Progress: Promising clinical trials coming out of Vietnam show that newly developed local vaccines are successfully showing defense against both the original parent strains and the newly emerging, highly complex recombinant genotype I/II variants currently moving through East Asia

Critical Action Items for Swine Producers:

1. Zero-Swill Enforcement: Immediately halt all food waste/swill feeding, as feed contamination remains the primary mechanism for domestic farm breaches

2. Feed Quarantine: Vet and hold all plasma-derived or compound feed ingredients sourced from known ASF-active countries or provinces

3. Passive Reporting: Train farm staff to report any unexplained mortality or hemorrhagic signs instantly; waiting for active vet cycles allows the high (up to 100%) case fatality rate to decimate entire facilities

Source: https://www.efsa.europa.eu/en/topics/topic/african-swine-fever