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Research Article

Serotype 3 human rotavirus strains with subgroup I specificity.

G Gerna, A Sarasini, A Di Matteo, L Zentilin, P Miranda, M Parea, F Baldanti, S Arista, G Milanesi, M Battaglia
G Gerna
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A Sarasini
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A Di Matteo
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L Zentilin
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P Miranda
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M Parea
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F Baldanti
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S Arista
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G Milanesi
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M Battaglia
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ABSTRACT

During an epidemiological study on human rotavirus (HRV) infections in Italy, three subgroup I strains not associated with serotype 2 reactivity were detected. All three strains were serotype 3, each with a distinct RNA pattern showing fast-moving tenth and eleventh segments (long electropherotype). Following successful adaptation to growth in cell cultures, the serotype 3 strains (MZ58, PCP5, and PA710) were further characterized by neutralization and by RNA-RNA (Northern blot) hybridization. Antiserum to reference HRV strain YO (subgroup II, serotype 3), as well as a monoclonal antibody to VP7 of YO neutralized, at comparable titers, the homologous virus, the three unusual HRV strains, and two reference simian strains (SA11 and RRV-2, both subgroup I, serotype 3), whereas SA11 antiserum and a monoclonal antibody to VP7 of SA11 neutralized simian strains more efficiently. However, antiserum to PCP5 neutralized the three unusual isolates and the simian strains at significantly higher titers than it did with reference strain YO. With 32P-labeled RNA from MZ58 as a probe, a high degree of homology was detected by Northern blot hybridization with strains PCP5, PA710, SA11, and UK (bovine rotavirus) at the level of several segments and with strain YO only at the level of genes 7 to 9. Conversely, labeled RNA of strain YO hybridized extensively with Wa (subgroup II, serotype 1 HRV strain) but only at the level of genes 7 to 9 with MZ58, PCP5, PA710, SA11, and UK. Finally, the labeled SA11 probe hybridized at the level of RNA segments 1 to 3 and 6 to 11 to the three unusual strains. These findings suggest that the unusual subgroup I, serotype 3, strains isolated from humans are more likely to be animal rotaviruses rather than natural reassortants between different HRV strains.

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Serotype 3 human rotavirus strains with subgroup I specificity.
G Gerna, A Sarasini, A Di Matteo, L Zentilin, P Miranda, M Parea, F Baldanti, S Arista, G Milanesi, M Battaglia
Journal of Clinical Microbiology Jun 1990, 28 (6) 1342-1347; DOI:

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Serotype 3 human rotavirus strains with subgroup I specificity.
G Gerna, A Sarasini, A Di Matteo, L Zentilin, P Miranda, M Parea, F Baldanti, S Arista, G Milanesi, M Battaglia
Journal of Clinical Microbiology Jun 1990, 28 (6) 1342-1347; DOI:
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