Here, the authors detect clade 2.3.4.4b H5N1 viruses in elephant seals associated with a mass mortality event in Argentina, show that the viruses belong to a clade primarily seen in marine mammals in South America and that they carry mammal-adaptation mutations suggestive of potential mammal-to-mammal transmission.
- Marcela M. Uhart
- Ralph E. T. Vanstreels
- Agustina Rimondi
