Veterinary pathologists at the University of Pennsylvania School of Veterinary Medicine are performing necropsies and tissue evaluation to discover what has caused more than 200 dolphin deaths along the Mid-Atlantic coast this summer. "One of the saddest things to see on these creatures is some have horrible pneumonias and ulcers so you know that they are suffering," said veterinarian Perry Habecker, chief of large-animal pathology at the school's New Bolton Center. Morbillivirus has been confirmed in some cases, but scientists aren't sure whether it's the cause of death or a secondary infection.

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