Summary
Between October and December, 2006, high activity of three genetically distinct norovirus GII-4 subtypes was observed in Chiba prefecture, Japan. One subtype was newly identified in this period and it was detected in 85% of outbreaks.
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Okada, M., Ogawa, T., Yoshizumi, H. et al. Genetic variation of the norovirus GII-4 genotype associated with a large number of outbreaks in Chiba prefecture, Japan. Arch Virol 152, 2249–2252 (2007). https://doi.org/10.1007/s00705-007-1028-8
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DOI: https://doi.org/10.1007/s00705-007-1028-8