EFSA Report Reveals 76% Spike in EU Swine ASF Outbreaks; Disease Re-emerges in Spain After 31 Years

Following is an update for the Month of May 2026, of the current spate and status of African Swine Fever cases in Europe, as of May 21, 2026.

In a major development for the global livestock sector, the European Food Safety Authority (EFSA) has released its highly anticipated annual epidemiological report. The findings reveal a sharp, highly disruptive escalation of African Swine Fever (ASF) across the 27-member European Union bloc.

According to official data validated by EFSA, ASF outbreaks in domestic pig commercial operations surged by 76% over the tracked consecutive annual period. Simultaneously, virus detections in wild boar populations spiked by 44%, exceeding 11,000 recorded cases—the highest level seen since 2021.

The headline shaking global agricultural markets, however, is the formal re-emergence of the virus in Spain, the European Union’s top pork producer and an export powerhouse, after more than three decades of disease-free status.

Numbers Behind the Surge

The underlying figures published in the epidemiological ledger illustrate a expanding biosecurity crisis across Europe:

• Domestic Pig Sector: The EU officially registered 585 distinct ASF outbreaks across domestic commercial and smallholder farms, marking a 76% year-on-year increase

• Wild Boar Reservoir: Detections in wild boar rose to 11,036 cases, presenting a persistent, mobile wildlife reservoir that threatens to spill into biosecure commercial facilities

• Country-Specific Vectors: The geometric increase in domestic herd outbreaks was overwhelmingly driven by Romania, which accounted for 81% of all reported domestic pig cases. Secondary, aggressive clusters were similarly logged by state veterinary departments in Croatia, Estonia, and Latvia. Poland remained the primary hotspot for wildlife transmission, capturing 31% (nearly one in three) of all wild boar detections

Spain’s 31-Year Firewall Collapses

The most economically significant update in the report is Spain’s loss of its decades-long ASF-free status. The virus was first re-detected in late November in Catalonia, marking the first time the country has faced the pathogen since 1994.

While European Commission disease monitoring systems confirm that intense population control, carcass surveillance, and strict zone controls (including the closure of Collserola Natural Park) have successfully prevented spillover into commercial Spanish pig farms, the biological pathway of the introduction has sent shockwaves through regional biosecurity teams. EFSA scientists confirmed that Spain—alongside specialized wild boar detections in Germany’s North Rhine-Westphalia region—represents a case of long-distance viral jump. The nearest active ASF outbreak to Catalonia was located in northern Italy, roughly 700 kilometers away.

Because the virus re-emerged far from known, gradually expanding infected zones, EFSA concluded the virus was carried over long distances via human-mediated paths—such as contaminated food waste, unvetted livestock transport vehicles, or fomites—rather than through natural wildlife migration.

Genetic Anomalies: A Novel Subgroup Emerges

Outbreak assessments submitted by EU Veterinary Emergency Teams (EUVET) and the Standing Committee on Plants, Animals, Food and Feed (PAFF) have added a layer of complexity to the epidemiological investigation.

Genetic sequencing of the Spanish virus strains verified that it belongs to Genotype II (the overarching genotype currently circulating across the European continent). However, molecular mapping revealed a novel nucleotide change in the sequence, categorizing it as an entirely distinct subgroup.

This specific genetic divergence means diagnostic laboratories cannot pinpoint the exact geographical origin of the strain, indicating that a hidden transmission chain may have been active before its formal interception.

Trade Consequences and Industry Response

African Swine Fever is completely harmless to humans but carries a mortality rate approaching 100% in infected pigs, and there is currently no commercially cleared, universally adopted vaccine within the EU. Consequently, disease control relies entirely on aggressive depopulation (culling) within active zones.

While EFSA noted that the average geographical size of restricted zones across the EU has remained broadly stable due to localized zoning containment protocols, the threat to international trade remains critical. Spain’s pork industry, valued at billions of euros, has rapidly transitioned to Regionalized Disease Zoning (Restricted Zones I and II) recognized by the EU. This regulatory framework allows unaffected provinces outside the Catalonia wildlife containment zone to continue exporting pork products, averting an immediate nationwide trade shutdown.

Moving forward, EFSA is advising all 14 affected member states to drastically scale up passive surveillance—the testing of found-dead wild boar carcasses and clinically symptomatic farm animals—which historically caught 84% of domestic and 73% of wildlife outbreaks before wide-scale viral shedding occurred.