{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T23:55:04Z","timestamp":1792626904894,"version":"4.5.0"},"reference-count":255,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2024,5,2]],"date-time":"2024-05-02T00:00:00Z","timestamp":1714608000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"University of Georgia College of Veterinary Medicine"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Animals"],"abstract":"<jats:p>Avian influenza viruses (AIVs) are highly contagious respiratory viruses of birds, leading to significant morbidity and mortality globally and causing substantial economic losses to the poultry industry and agriculture. Since their first isolation in 2013\u20132014, the Asian-origin H5 highly pathogenic avian influenza viruses (HPAI) of clade 2.3.4.4b have undergone unprecedented evolution and reassortment of internal gene segments. In just a few years, it supplanted other AIV clades, and now it is widespread in the wild migratory waterfowl, spreading to Asia, Europe, Africa, and the Americas. Wild waterfowl, the natural reservoir of LPAIVs and generally more resistant to the disease, also manifested high morbidity and mortality with HPAIV clade 2.3.4.4b. This clade also caused overt clinical signs and mass mortality in a variety of avian and mammalian species never reported before, such as raptors, seabirds, sealions, foxes, and others. Most notably, the recent outbreaks in dairy cattle were associated with the emergence of a few critical mutations related to mammalian adaptation, raising concerns about the possibility of jumping species and acquisition of sustained human-to-human transmission. The main clinical signs and anatomopathological findings associated with clade 2.3.4.4b virus infection in birds and non-human mammals are hereby summarized.<\/jats:p>","DOI":"10.3390\/ani14091372","type":"journal-article","created":{"date-parts":[[2024,5,2]],"date-time":"2024-05-02T07:04:14Z","timestamp":1714633454000},"page":"1372","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":138,"title":["Highly Pathogenic Avian Influenza (HPAI) H5 Clade 2.3.4.4b Virus Infection in Birds and Mammals"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9857-1298","authenticated-orcid":false,"given":"Giulia","family":"Graziosi","sequence":"first","affiliation":[{"name":"Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell\u2019Emilia, 40064 Bologna, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2085-3516","authenticated-orcid":false,"given":"Caterina","family":"Lupini","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell\u2019Emilia, 40064 Bologna, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6232-0857","authenticated-orcid":false,"given":"Elena","family":"Catelli","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell\u2019Emilia, 40064 Bologna, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1656-4068","authenticated-orcid":false,"given":"Silvia","family":"Carnaccini","sequence":"additional","affiliation":[{"name":"Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,5,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2429","DOI":"10.1007\/s00705-022-05516-5","article-title":"Recent changes to virus taxonomy ratified by the International Committee on Taxonomy of Viruses (2022)","volume":"167","author":"Walker","year":"2022","journal-title":"Arch. 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