The avian influenza outbreak that threatened California's marine mammals has subsided, with no positive cases detected since March 14, 2026. A rapid, coordinated response involving multiple agencies and universities was key.
- The outbreak, first detected in February 2026, affected 64 animals out of 233 tested, with elephant seals the most impacted. - The virus was identified as HPAI H5N1 A3 genotype, likely spread from birds along the Pacific Flyway.
- Researchers used traditional observation, drone surveys, and satellite transmitters to monitor the outbreak. - The response serves as a model for future interagency action against zoonotic diseases.
The successful containment highlights the importance of established monitoring programs and rapid collaboration between researchers and agencies.