Severe neurologic disease and chick mortality in crested screamers (Chauna torquata) infected with a novel Gyrovirus

Virology
Tony L GoldbergRoberta Wallace

Abstract

Gyroviruses are small, single stranded DNA viruses in the family Anelloviridae. In chickens, the type virus (chicken anemia virus; CAV) causes epidemic disease in poultry flocks worldwide. In 2007 and 2008, young crested screamers (Chauna torquata) at a zoo in Wisconsin, USA, died of neurologic disease with clinical and pathological features resembling CAV infection. Conventional diagnostics were negative, but molecular analyses revealed coinfection of an affected bird with three variants of a novel Gyrovirus lineage, GyV10. Analysis of ten additional screamers from this and another zoo revealed infection in all but one bird, with co-infections and persistent infections common. The association between GyV10 ("screamer anemia virus," provisionally) and the disease remains unproven, but certain immunological and neurologic features of the syndrome would expand the known pathologic consequences of Gyrovirus infection. To control the virus, autogenous vaccines, environmental decontamination, and management strategies to limit vertical and horizontal transmission might prove effective.

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Citations

Sep 22, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jacob D NegreyTony L Goldberg
Dec 19, 2020·Scientific Reports·Jessy VibinSoren Alexandersen
Aug 14, 2021·Veterinary Microbiology·Shiyu YuanZiqiang Cheng
Jan 12, 2022·American Journal of Primatology·Jacob D NegreyTony L Goldberg

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