Abstract
To investigate the serotypic and genetic diversity of human rotavirus strains, we have tested 513 and 519 fecal rotavirus specimens, respectively, by an enzyme-linked immunosorbent assay with serotype-specific monoclonal antibodies and by polyacrylamide gel electrophoresis of the segmented RNA genome. Of the 513 specimens, 375 were typed as serotype 1 (47.3%), serotype 2 (2.9%), serotype 3 (2.9%), or serotype 4 (17.7%). In addition, a presumptive new human serotype, tentatively referred to as serotype X in this paper, was found in 1.6% of the specimens tested. The remaining 138 specimens (26.9%) were untypeable. Considerable variation in relative frequency of circulating serotypes was observed with respect to geographic locations and observation periods. Rotavirus RNAs were visualized in 481 of 519 specimens tested. Of these, 415 were typed as 33 electropherotypes, many of which were infrequently detected and were restricted to single epidemics. Analysis of the 291 specimens whose electropherotypes and serotypes were available indicated clearly that a given RNA pattern always corresponded to a particular serotype. Heterogeneity of electropherotypes within a serotype was similarly observed in strains belonging to the four previously established serotypes. The results obtained in this study indicated that antigenic changes on the major neutralization antigen occurred always with concurrent changes of genomic RNA electropherotypes. On the other hand, serotypic changes could not be predicted from the changes in RNA electropherotypes.
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