Article from The Poultry Site :
" MONGOLIA : Three swans found dead on a lake in south-east Mongolia, near the border with China, were infected with H5 subtype of the highly pathogenic avian influenza (HPAI) virus.
The veterinary authority sent an Immediate Notification dated 19 April to the World Organisation for Animal Health (OIE).
The report describes the finding of three Whooper swans (Cygnus cygnus) on 5 April at Zegst lake at Dariganga soum in Sükhbaatar province. The disease is reported to be subclinical and the birds have died.
The presence of an H5 sub-type of the avian influenza virus has been confirmed.
The last outbreak of HPAI in the country was in June 2010."