Abstract
To study the molecular characterization of CVA9 virus in Tibet. To isolate the enteroviruses from stool specimens of AFP cases and other children in Tibet in 1999-2002, and identify them by neutralization test using the RIVM antiserum; then determine the complete nucleotide sequence of VP1 region of CVA9 viruses, and analyze the results. A total of 10 strains of CVA9 virus were isolated from the stool specimens and identified. The complete nucleotide sequence of VP1 region of these CVA9 viruses were 906nt coding 302 amino acids. To compare with the sequences of the 10 strains of Tibet, the homogeneity of nucleotide sequence were 79.0% - 99.9%; while they were 75.7% - 78.7% compared with Griggs. The phylogenetic tree of CVA9 viruses showed 2 groups, and the isolates from Tibet belong to 1, 2 groups. The deduction is that the 10 strains are proposed 2 different groups, the strains epidemic in 1999 belong to group 2,while strains in 2000 belong to group 1.
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