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J Clin Microbiol. 1987 October; 25(10): 1891-1896

Antigenic characterization of rotaviruses isolated in Kenya from 1982 to 1983.

Department of Hygiene, Sapporo Medical College, Japan.

ABSTRACT

The electropherotypes of human rotavirus RNAs from 100 diarrheic stool specimens collected in two major districts of Kenya from 1982 to 1983 were previously reported (Y. Chiba, C. Miyazaki, Y. Makino, L. N. Mutanda, A. Kibue, E. O. Lichenga, and P. M. Tukei, J. Clin. Microbiol. 19:579-582, 1984). Of these specimens, 25 that contained rotaviruses with different RNA electropherotypes were subjected to a virus isolation experiment with MA-104 cells, and 16 rotavirus strains were isolated. The use of an enzyme-linked immunosorbent assay with subgroup-specific monoclonal antibodies enabled us to successfully subgroup 15 isolates: 4 in subgroup I and 11 in subgroup II. By fluorescent-focus-neutralization test with serotype-specific rabbit antisera, 13 isolates could be serotyped: 7 as serotype 1, 4 as serotype 2, and 2 as serotype 3. Of the remaining three isolates, F153, F247, and G402, the former was doubly neutralizable with serotype 1 and serotype 4 antisera and the latter two were neutralizable with serotype 3 and serotype 4 antisera. Detailed analysis with the antisera against F153 and F247 and four serotype-specific, VP7-directed monoclonal antibodies suggested that F153 is a serotypic mosaic strain with serotype 4-specific VP3 and serotype 1-specific VP7 outer capsid proteins and F247 and G402 are possibly antigenic mosaic strains with serotype 3 and serotype 4 antigens. On the basis of the correspondence of the rotavirus isolate serotypes determined in this study to the electropherotypes reported previously, it was inferred that serotype 1 strains were most prevalent in two districts of Kenya from 1982 to 1983, followed by any type of serotypic mosaic strains.

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