Abstract Since 2020, H5Nx high pathogenicity avian influenza viruses (HPAIVs) have caused widespread disruptions not only to global agriculture and trade but also to the health of free-ranging wildlife . Pinnipeds have experienced greater mortality from H5Nx HPAIV than any other mammalian taxa . Emergent virus strains, persisting over long time periods and vast geographic distances , have repeatedly triggered large-scale mortality events in pinniped populations. Of particular concern is the spread of H5Nx HPAIV to the Southern Hemisphere —including the emergence of a marine mammal-adapted clade in South America and detections in the sub-Antarctic and Antarctic —and to other remote locations such as the Hawaiian Islands . These developments elevate concern for the world’s endangered, isolated and endemic pinnipeds . While managing HPAIV in any animal population is a formidable task, working with free-ranging marine mammals poses unique challenges. In this review and perspective pi...
#Analysis of the Monophyletic #Lineage of Avian #Influenza #H5N1 Which Circulated in #Venezuelan #Birds During the 2022–2023 #Outbreak
Abstract Avian influenza subtype H5N1 has caused outbreaks worldwide since 1996, with the emergence of the Guandong lineage in China. The current clade 2.3.4.4b has evolved from this lineage, with increased virulence and mass mortality events in birds and mammals . The objective of this study was the analysis of 17 viral genomes of H5N1 avian influenza isolated in Venezuela during the 2022–2023 outbreak. The eight viral genomic segments were amplified using universal primers and sequenced via next-generation sequencing. The sequences were analyzed to confirm the H5 hemagglutinin clade , identify possible genetic reassortments , and perform a phylogenetic and docking analysis of the viral isolates. The viruses found in Venezuela belonged, as expected, to clade 2.3.4.4b and formed a monophyletic clade with North American influenza viruses , with no evidence of further reassortment. The introduction of the virus in South America is associated with bird migration through the Atlantic (Vene...