Highly Pathogenic Avian Influenza A(H5N1) Virus in a Harbor Porpoise, Sweden

Emerg Infect Dis. 2023 Apr;29(4):852-855. doi: 10.3201/eid2904.221426. Epub 2023 Mar 14.


We found highly pathogenic avian influenza A(H5N1) virus clade associated with meningoencephalitis in a stranded harbor porpoise (Phocoena phocoena). The virus was closely related to strains responsible for a concurrent avian influenza outbreak in wild birds. This case highlights the potential risk for virus spillover to mammalian hosts.

Keywords: H5N1 subtype; Phocoena; Sweden; influenza; influenza A virus; influenza in birds; mammals; meningitis/encephalitis; pathology; porpoises; viruses; wild animals; zoonoses.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Influenza A Virus, H5N1 Subtype* / genetics
  • Influenza A virus*
  • Influenza in Birds* / epidemiology
  • Mammals
  • Phocoena*
  • Phylogeny
  • Sweden / epidemiology