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Evidence of Hearing Loss and Unrelated Toxoplasmosis in a Free-Ranging Harbour Porpoise (Phocoena phocoena)
- Source :
- Animals, Volume 11, Issue 11, Animals, Vol 11, Iss 3058, p 3058 (2021)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
Abstract
- Evidence of hearing impairment was identified in a harbour porpoise (Phocoena phocoena) on the basis of scanning electron microscopy. In addition, based on histopathology and immunohistochemistry, there were signs of unrelated cerebral toxoplasmosis. The six-year old individual live stranded on the Dutch coast at Domburg in 2016 and died a few hours later. The most significant gross lesion was multifocal necrosis and haemorrhage of the cerebrum. Histopathology of the brain revealed extensive necrosis and haemorrhage in the cerebrum with multifocal accumulations of degenerated neutrophils, lymphocytes and macrophages, and perivascular lymphocytic cuffing. The diagnosis of cerebral toxoplasmosis was confirmed by positive staining of protozoa with anti-Toxoplasma gondii antibodies. Tachyzoites were not observed histologically in any of the examined tissues. Ultrastructural evaluation of the inner ear revealed evidence of scattered loss of outer hair cells in a 290 µm long segment of the apical turn of the cochlea, and in a focal region of ~ 1.5 mm from the apex of the cochlea, which was compatible with noise-induced hearing loss. This is the first case of concurrent presumptive noise-induced hearing loss and toxoplasmosis in a free-ranging harbour porpoise from the North Sea.
- Subjects :
- inner ear
Noise‐induced hearing loss
Veterinary medicine
encephalitis
Toxoplasma gondii
live stranding
veterinary(all)
hair cell
noise-induced hearing loss
Post‐mortem examination
Live stranding
QL1-991
Inner ear
SF600-1100
otorhinolaryngologic diseases
Encephalitis
Animal Science and Zoology
North Sea
Hair cell
post-mortem examination
Zoology
Subjects
Details
- Language :
- English
- ISSN :
- 20762615
- Database :
- OpenAIRE
- Journal :
- Animals
- Accession number :
- edsair.doi.dedup.....506f1833c4e765c0e708c4aa9032cb1b
- Full Text :
- https://doi.org/10.3390/ani11113058