The Genotype 2 (G2, LD9, G2P12), Genotype 3 (G3, LS4/9, G3P2), Genotype 4 (G4, LH9, G4P12) strains, monovalent and trivalent human–lamb reassortant rotavirus samples, and the trivalent standard were all prepared and provided by Lanzhou Institute of Biological Products Co., Ltd., China. The trivalent standard was prepared with the same three batches of virus stock solution (G2–G4) used in phase III clinical trials, and the titer ((lgCCID50/mL) of each component in trivalent rotavirus standard is 5.9 for LD9, 6.2 for LS4/9 and LH9, respectively.
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