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Title: Cerebral nasitremiasis in a Blainville's beaked whale (Mesoplodon densirostris) stranded in the Canary Islands
Authors: Felipe Jiménez, Idaira Del Carmen 
Fernández Rodríguez, Antonio Jesús 
Bernaldo De Quirós Miranda, Yara 
Arregui Gil,Marina 
Puig Lozano,Raquel Patricia 
Arbelo Hernández, Manuel Antonio 
Sierra Pulpillo, Eva María 
UNESCO Clasification: 3109 Ciencias veterinarias
Keywords: Blainville'S Beaked Whale
Mesoplodon Densirostris
Nasitrema Sp., et al
Issue Date: 2023
Journal: Research in Veterinary Science 
Abstract: Ten species within the genus Nasitrema (subfamily Nasitrematinae, family Brachycladiidae) have been reported infecting a wide variety of odontocetes worldwide, although there is still a lack of information about their presence in beaked whales (BWs). Nasitrema spp. are commonly described inhabiting the pterygoid sinus, the tympanic cavities, and the middle and inner ear; although aberrant migrations through the brain have been also reported. This trematode may cause different type of lesions, ranging from mild to severe saculitis, neuritis, otitis, and/or meningoencephalitis that may impede cetaceans to survive in the wild, resulting in incoordination, loss of equilibrium, and echolocation dysfunction ending in a stranding event. The presence of Nasitrema sp. was found in an adult female Blainville beaked whale stranded death in Fuerteventura, Canary Islands, on November 2016. The most relevant gross finding was a severe chronic-active multifocal pyogranulomatous and necrotizing encephalitis. Histologically, multiple areas of necrosis, pyogranulomatous and eosinophilic inflammation, haemorrhages and occasional cholesterol crystals were found associated with parasitic structures compatible with an adult trematode and its eggs. Molecular analysis, based on a quantitative polymerase chain reaction (qPCR) of the brain tissue sample detected 99% homology with a partial sequence of the NADH dehydrogenase subunit 3 (ND3) gene of Nasitrema delphini. In addition, liver, kidney, prescapular lymph node and brain samples were positive to herpesvirus (conventional nested PCR). Evidence of the presence of this parasite was not found in any of the 54 beaked whales (n = 54) stranded on the Canary Islands between 1999 and 2017, specifically 35 Cuvier's BWs and 19 specimens belonging to the Mesoplodon genus. To our knowledge, the current study represents the first description of a nasitremiasis in a member of the Ziphiidae family.
ISSN: 0034-5288
DOI: 10.1016/j.rvsc.2023.03.009
Source: Research in Veterinary Science[ISSN 0034-5288],v. 158, p. 56-64, (Mayo 2023)
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