In this study, a novel bovine group A rotavirus (BoRV-A), Sun9, isolated from calf diarrhea in Tochigi Prefecture, Japan, was serologically characterized by a cross-neutralization assay, and serological surveillance by using its reassortant was performed on cattle bred in Japan. The G serotype of Sun9 was identified as G serotype 8 based on the one- or two-way serological relationships observed in Sun9 and other G8 strains. The P serotype of Sun9 was identified as P serotype 11 based on the one- or two-way serological relationships observed in Sun9, its reassortants, and the P11 lapine group A rotavirus R-2. The serological surveillance data indicated that 2.4% of the specimens appeared to possess antibodies against the P11 antigen. Few P11 bovine group A rotaviruses may exist in the Japanese cattle population. © 2005 Elsevier B.V. All rights reserved.
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