HI and NT titers against the NIBRG-14 virus.

<p>Neutralizing activities in sera collected from immunized mice were determined by measuring (A) HI and (B) NT titers against the NIBRG-14 (clade 1) H5N1 influenza virus. Results showed that the DNA-HA vector priming/FliC-VLP booster regiment elicited the highest magnitude of neutralizing antibodies. For calculation purposes, undetectable titers were scored as 1. Individual titers (points) and geometric means (lines) are given for each group.