Induction of serum antibodies in 2-week-old chickens in response to infection with parental and chimeric viruses.

<p>Chickens were inoculated with each virus (64 HA units) by the intranasal route in the same experiment as Table 2. Sera were collected at 2, 3, 4, and 5 weeks post-infection. Virus-specific antibodies were measured by a hemagglutination inhibition assay using rLaSota (A) or rBan/AF (B) virus and chicken erythrocytes.