FIG. 3.
Induction of cross-reactive antibodies by Ad5.HA. Cross-reactivity of sera against other H5N1 strains was tested by using the influenza A/Indo/05/2005 (H5N1) × PR8 virus strain in an HI test. Sera collected at weeks 4 (w4) and 10 (w10) from Ad5.HA (1010, 109, 108, or 107 vp) or control Ad5 (1010 vp)-immunized chickens were tested in parallel against 8 HA units of the influenza A/VN/1203/04 (H5N1) × PR8 or influenza A/Indo/05/2005 (H5N1) × PR8 virus. Results are shown as the log2 value of the geometric mean (GMT) of each group.