Proliferation and teratogenicity of Aino virus in chick embryos

Comparison of intertypic antigenicity of Aino virus isolates by dot immunobinding assay using neutralizing monoclonal antibodies

Neutralizing monoclonal antibodies (MAbs) against the Aino virus were prepared, and the neutralizing epitopes of the virus were defined by competitive binding assay. Seven continuous and overlapping neutralizing epitopes existed on the G1 glycoprotein of the Aino virus. Two antigenic domains were identified and were designated I and II, with domain II consisting of six epitopes. Dot immunobinding assays (DIAs) were performed with MAbs that recognized these seven neutralizing epitopes. DIAs were performed with 1 Australian strain and 21 isolates found in Japan between the years 1964 and 1995. The MAb response patterns of all isolates were divided into four groups. The Japanese isolates did not show large differences in antigenicity, but the antigenicity of the Australian strain collected in 1968 was significantly different from that of the Japanese strains; the Australian strain lacked reactivity to three epitopes and showed only low reactivity to one epitope.

Aino virus antigen in brain lesions of a naturally aborted bovine fetus

A bovine fetus aborted at 187 days of gestation was serologically and immunohistopathologically examined. Serum and cerebrospinal fluid samples had high titers of virus-neutralizing antibody for Aino virus. A severe necrotizing encephalopathy was noted. Aino virus antigen was demonstrated in neuroglial cells within the brain lesion. The destruction of developing neuronal cells appeared to be a significant feature of the pathogenesis of lesions due to Aino virus infection in the central nervous system.