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. 2008 Apr 23;3(4):e1993. doi: 10.1371/journal.pone.0001993

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Roukens 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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Pre- and postvaccination (2 weeks) serum dilutions at which 80% VN occurred in previously vaccinated participants. When 80% VN was not reached by the least diluted serum (1∶16), samples were defined as <16 (reciprocal serum dilution). VN = Virus neutralization.