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280 specimens of 29 species of wild living birds from 11 families captured in the endemic area of the virus Lednice in Southern Moravia (CSSR) were investigated by haemagglutination-inhibition test (HIT) on presence of antibodies against 12 arbovirus antigens of the groups Alfa-virus (Western and Eastern Equine Encephalomyelitis, Semliki, Sindbis, Chikungunya), Flavovirus (Tick-Borne Encephalitis, Dengue, West Nile), the Uukuniemi group (Poteplí), the Turlock group (Lednice) and the Bunyamwera supergroup (Tahyna, Calovo). Antibodies were found only against the virus Lednice, merely in water birds--i.e. in Mallard (Anas platyrhynchos)--31.9%, in Grey Lag-Goose (Anser anser)--17.2%, and in one of three Mute Swans (Cygnus olor). In relation to these findings the question of ornithophilia of mosquitoes of Culex modestus species, which are the only probable vectors of Lednice virus as yet, is discussed.