We collected data on mass mortality in Sandwich terns (Thalasseus sandvicensis) during the 2022 breeding season in the Netherlands. Mortality was associated with at least 2 variants of highly pathogenic avian influenza A(H5N1) virus clade 2.3.4.4b. We report on carcass removal efforts relative to survival in colonies. Mitigation strategies urgently require structured research.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9707584PMC
http://dx.doi.org/10.3201/eid2812.221292DOI Listing

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