7Lord RD,Calisher CH.Further evidence of southward transport of arboviruses by migratory birds[J].Am J Epidemiol,1970,92:73-78.
8Antipa C,Girjabu E,Iflimovici R,et al.Serological investigations concerning the presence of antibodies to arboviruses in wild birds[J].Virologie,1984,35:5-9.
9Rappole JH,Derrickson SR,Hubalek Z.Migratory birds and spread of West Nile virus in the western hemisphere[J].Emerg Infect Dis,2000,6:319-328.