Feline immunodeficiency virus (FIV) is classified into five genotypes, A, B, C, D and E, based on the phylogenetic analysis of the env V3-V5 region. However, whether there is correlation between phylogenetic and antigenic diversities remains unknown. In this study, we examined the cross virus neutralization of FIV genotypes A through E by sera from cats infected with a single genotype. The results indicated some relationships between phylogenetic genotype and neutralization serotype, and that cross-clade virus neutralization is possible. For example, serum from a cat infected with genotype E virus neutralized all five FIV genotypes. Our results suggest that the FIV subtyping according to the sequence diversity is partially reflected by antigenic diversity and serum neutralization.
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