Overview

• Madrid officials confirmed highly pathogenic H5N1 at a Valdemoro laying-hen complex housing about 450,000 birds after testing at the national laboratory.
• Castilla y León declared secondary H5N1 foci in Aguasal and Olmedo, epidemiologically linked to the September 19 Olmedo outbreak, with flocks of roughly 14,000 and 88,000 hens.
• The new cases bring Spain’s 2025 tally to nine poultry outbreaks, alongside about 40 detections in wild birds across multiple regions and two in captive birds.
• Authorities imposed farm immobilization, 3 km protection and 10 km surveillance zones, culling of affected birds, and cleaning and disinfection, with heightened biosecurity rules.
• Argentina’s Senasa reported more than 28 days without new cases after an August outbreak in Los Toldos, self-declared disease freedom to the OMSA, and moved to restart avian-product trade.