Cygnet River virus was isolated in 2010 from embryonated eggs of the Muscovy duck (Cairina moschate) from Cygnet River, Kangaroo Island in Australia.
The virus was associated with an outbreak of severe disease in farmed ducks.

Wellfleet Bay virus was isolated from wild common eider ducks (Somateria mollissima) overwintering at Jeremy Point, Wellfleet Bay in Cape Cod, Massachusetts, USA.
The virus was associated with an outbreak of severe disease in 2010, and is hypothesised to have been a factor in a series of similar outbreaks in 1998–2013.

The two viruses are closely related and might be strains of the same virus; they are also related to Quaranfil virus.
Cygnet River virus was isolated in 2010 from embryonated eggs of the Muscovy duck (Cairina moschate) from Cygnet River, Kangaroo Island in Australia. The virus was associated with an outbreak of severe disease in farmed ducks.
Wellfleet Bay virus was isolated from wild common eider ducks (Somateria mollissima) overwintering at Jeremy Point, Wellfleet Bay in Cape Cod, Massachusetts, USA. The virus was associated with an outbreak of severe disease in 2010, and is hypothesised to have been a factor in a series of similar outbreaks in 1998–2013.
The two viruses are closely related and might be strains of the same virus; they are also related to Quaranfil virus.
Quaranjavirus