H5N1 HPAI outbreak & full mink farm cull, Galicia
Enforcement Action
Expired
October 18, 2022
Summary
In the first week of October 2022, an acute increase in mink mortality was observed at an intensive American mink fur farm in Carral, municipality of A Coruña, Galicia, Spain. On 4 October 2022, the farm veterinarian collected oropharyngeal swabs and submitted them to the Central Veterinary Laboratory (Laboratorio Central de Veterinaria, LCV) of the Spanish Ministry of Agriculture, Fisheries and Food (MAPA), which confirmed infection with highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b and excluded SARS-CoV-2. On 13 October 2022, regional animal health services conducted a census and recorded 51,986 American mink (Neovison vison) housed in wire cages in partially open barns on the farm. Following confirmation of H5N1 infection, competent animal health authorities issued an official depopulation order. Culling operations began on 18 October 2022 and proceeded in batches of 150–200 animals; all mink on the farm were killed and carcasses and contaminated waste destroyed by 17 November 2022.
During the outbreak period, affected mink displayed loss of appetite, hypersalivation, depression, bloody snout, and neurological signs; mortality peaked at approximately 4.3% in one week before culling commenced. Movement restrictions were imposed on the farm. Eleven workers with direct contact with animals underwent nasopharyngeal testing on 13–14 October 2022 and subsequent symptom-based monitoring in November; all tested negative for avian influenza virus. The epidemiological and virological investigation, conducted by MAPA’s LCV in collaboration with Galicia’s regional animal health services and the EU Reference Laboratory for Avian Influenza at the Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe, Italy), documented mink-to-mink transmission of H5N1 and identified mutations consistent with adaptation to mammalian hosts. The detailed outbreak account was published in Eurosurveillance on 18 January 2023 (Aguero et al.). This was the first documented large-scale outbreak of HPAI H5N1 in intensively farmed mink in Europe, triggering international concern about cross-species transmission risk and calls for strengthened surveillance and biosecurity in intensive fur farming.
Background Context
Spain and the wider EU were experiencing extensive HPAI H5N1 clade 2.3.4.4b epizootic activity in wild birds and domestic poultry throughout 2021–2022, with multiple H5N1 detections in wild seabirds along the Galician coast in the months preceding the Carral outbreak. Spanish mink fur farming, concentrated in Galicia, operated under intensive cage-based systems feeding diets including raw fish and poultry by-products, cereals, and blood meal. Prior studies had documented mink susceptibility to influenza A viruses, and HPAI H5N1 had been detected in various mammalian species (foxes, seals), but a documented large-scale farmed-mammal H5N1 outbreak in Europe had not previously been recorded. The precise route of H5N1 introduction to the Carral farm — environmental contamination, wild bird contact, or feed sourcing — was not definitively established by investigators. EU and Spanish HPAI control regulations (notifiable disease frameworks) requiring official notification, epidemiological investigation, movement controls, and stamping-out in infected establishments provided the procedural basis for the depopulation response.
System Impact
Direction
Reduces Exploitation
Type
Changes Scale
Significance
Moderate
Increased mink mortality was first observed in the first week of October 2022. LCV confirmed H5N1 infection on or around 4 October 2022 following oropharyngeal swab submission. Regional animal health services conducted a census on 13 October 2022 recording 51,986 mink. The depopulation order was issued by competent animal health authorities, with culling operations beginning 18 October 2022 in batches of 150–200 animals. All mink were killed and carcasses and waste destroyed by 17 November 2022. All 11 directly exposed workers tested negative for avian influenza. Movement restrictions and enhanced biosafety measures were applied during and after the outbreak. The outbreak investigation produced detailed epidemiological and genetic documentation, with the peer-reviewed account published in Eurosurveillance on 18 January 2023. No subsequent H5N1 outbreaks at mink farms in Spain are documented in EFSA surveillance reports for 2023–2024 accessed in sources consulted. The commercial operator of the Carral farm is not identified in primary outbreak reports.
Anticipated Effects
Investigators and the EU Reference Laboratory called for strengthened biosafety and biosecurity measures in intensive mink farming, including specific surveillance programs for influenza A and other zoonotic pathogens. If these recommendations are implemented, they would reduce the likelihood of future virus introduction and undetected transmission events in intensive mink production systems.
If authorities and industry act on investigative findings regarding housing design and feed sourcing (raw poultry by-products), changes in farm infrastructure and feed supply could conditionally alter risk pathways for H5N1 and similar agents in mink farms while leaving the legal permissibility of mink fur farming unchanged.
Whether the farm restocked after November 2022, and whether the outbreak has produced lasting changes in Spain’s mink sector biosecurity practices or production scale, is not established in available sources.
Significance Rationale
Assigned Reduces Exploitation (impact direction) because the enforcement action eliminated all 51,986 mink at the Carral farm and halted production at that establishment for at least the period following depopulation.
Assigned Changes Scale (impact type) because the primary mechanism is mandatory full depopulation of all animals on the infected farm, directly reducing the number of mink in production and removing the facility’s output from fur supply chains.
Assigned Moderate significance because the enforcement action materially affects a single large farm (over 50,000 mink) but is limited to one facility; no national-level mink sector restructuring or additional farm closures are documented in sources consulted.
The duration and persistence of the scale change is not established in available sources: the farm’s post-cull operational status — whether it restocked, remained inactive, or was repurposed — has not been documented in primary outbreak reports.
Key Actors
The Central Veterinary Laboratory (LCV) of MAPA confirmed H5N1 infection and led the national laboratory investigation. Galicia’s regional animal health services conducted the census, issued the depopulation order, and implemented culling and movement restrictions. The EU Reference Laboratory for Avian Influenza at IZSVe (Italy) conducted virological and genetic characterisation and co-authored the Eurosurveillance report. Aguero et al. (Eurosurveillance, 18 January 2023) authored the primary scientific account. The commercial operator of the Carral farm is not named in primary outbreak reports.
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