The team discovered the virus in the mammal's brain and lungs, which had mutated to become 18 times more resistant to current drug treatments.
There has been a recent spread of 2.3.4.4b A(H5N1) among cetaceans, with cases in common dolphins, harbor porpoises, and Atlantic white-sided dolphins in different parts of the world.
For cetaceans (the group including dolphins and whales), however, bird flu is rare.
Though it's not exactly common for bird flu to kill seals and sea lions, it is not considered rare.
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