Abstract:
:Hydranencephaly, the almost complete absence of the cerebral parenchyma, induced by infection with modified live bluetongue virus (BTV) crossing the placenta has previously been reported in sheep and rarely in cattle in the USA and in South Africa. The current study describes 29 cases of hydranencephaly in bovine foetuses and 'dummy' calves up to 3 months of age in Belgium associated with natural BTV serotype 8 infection very early in gestation. Histological examination of the remaining cerebral parenchyma showed moderate to severe atrophy of the neural tissue. The lesions observed support the hypothesis of BTV-induced destruction of precursor cells. However, in several calves a slight infiltration of the walls of venules and arterioles with T lymphocytes (vasculitis) was observed as well, which seems to be responsible for at least some of the lesions. Bluetongue viral RNA was detected in 15 animals using a BTV-specific real-time RT-PCR with a much higher success rate in brain tissues compared with blood and spleen samples. Virus isolation in embryonated eggs was unsuccessful. In conclusion, hydranencephaly in calves can be associated with natural wild-type BTV-8 intra-uterine infection.
journal_name
Transbound Emerg Disjournal_title
Transboundary and emerging diseasesauthors
Vercauteren G,Miry C,Vandenbussche F,Ducatelle R,Van der Heyden S,Vandemeulebroucke E,De Leeuw I,Deprez P,Chiers K,De Clercq Kdoi
10.1111/j.1865-1682.2008.01034.xsubject
Has Abstractpub_date
2008-09-01 00:00:00pages
293-8issue
7eissn
1865-1674issn
1865-1682pii
JVA1034journal_volume
55pub_type
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