Deaths of gray and harbor seals, in much greater numbers than usual, have been attributed to viruses related to distemper and the flu.
Many of the dead seals that washed ashore in northern New England in the past few weeks tested positive for either avian influenza or phocine distemper virus, but it is still too soon to say if those viruses are the primary causes of the unusual die-off.
Thawing sea ice may have opened the door, allowing the infection to cross oceans, a new study suggests.
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