H5N1 avian influenza found in stranded harbor porpoise AvianInfluenza H5N1 Influenza porpoise CDC_NCEZID naturhistoriska
Background The highly pathogenic H5N1 avian influenza virus has recently been associated with a large number of deaths among domestic and wild birds in Europe and North America. This H5N1 strain belongs to the 2.3.4.4b clade and is believed to have infected about 112 species, including a large number of marine birds.
About the study In the present study, the researchers reported a case of a stranded male P. phocoena individual around the west coast of Sweden, which seemed unwell and was unable to right itself while swimming in circles. Unfortunately, the seal died shortly after getting stranded, and so the carcass was subjected to necropsy.
Results The results from the necropsy reported no significant macroscopic findings except pulmonary edema, which was due to the drowning. However, microscopic evidence of lymphoplasmacytic meningoencephalitis, including gliosis, necrosis, vasculitis, and perivascular cuffing, was detected in the brain. The lung tissue also contained a higher number of alveolar macrophages and evidence of mononuclear septal thickening.
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