Handout of the leg of a purple ochre sea star is shown disintegrating as it dies from sea star wasting syndrome in OregonScientists investigating a huge die-off of starfish along North America’s Pacific coast have identified a virus they say is responsible for a calamitous wasting disease that has wiped out millions of the creatures since it first appeared last year. The scientists said on Monday they identified the pathogen as the Sea Star Associated Densovirus, or SSaDV, after ruling out other possible culprits including certain bacteria, protozoans and fungi. More