ArticleOne health (Amsterdam, Netherlands)2026
Circulation and overwintering of Usutu virus lineages in north-eastern Spain: A one health perspective (2021-2025).
Article in One health (Amsterdam, Netherlands), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Usutu virus (USUV) is a mosquito-borne flavivirus that has expanded widely across Europe. While it has been traditionally considered an animal pathogen, reports of human infections and the detection of USUV in blood donors in Europe (including Spain) have increased the public health awareness of this emerging pathogen. In the last decade, serological evidence of USUV circulation in animals have been reported in Northeastern Spain (Catalonia) where human infections have also been recently detected; however, molecular confirmation of viral circulation in wild birds was still lacking. Our main goal was to investigate USUV circulation in Catalonia (2021-2025) using One Health approach through the West Nile virus surveillance program. Once USUV was detected, we aimed to assess USUV overwintering, genetic diversity and pathology in positive wild birds. From 369 bird samples collected, six blackbirds from the Barcelona province resulted USUV-positive in 2022, 2024, and 2025, showing signs of systemic infection. Additionally, USUV was found in a
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