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. 2013 Feb 14;7(2):e2067. doi: 10.1371/journal.pntd.0002067

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© 2013 Huang et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Sera were collected from young children infected with genotypes C2, C4, B4 and B5 viruses at different years. The dots indicate individual antibody titers and the bars indicate geometric mean titers (GMT) and their 95% confidence intervals. Serum neutralizing antibody titers against the homologous genotype (C2) in children infected in 1998 varied over 100-fold so they were grouped into two groups (low and high titers) for calculating GMT.