During November-December 2017, a mass die-off of Guiana dolphins (Sotalia guianensis) began in Rio de Janeiro, Brazil. Molecular and pathologic investigations on 20 animals indicated that cetacean morbillivirus played a major role. Our findings increase the knowledge on health and disease aspects of this endangered species.
Keywords: Paramyxoviridae; Sotalia guianensis; die-off; dolphin; immunosuppression; marine mammals; morbillivirus outbreak; pathology; viruses.