Efficacy of a Recombinant Turkey Herpesvirus AI (H5) Vaccine in Preventing Transmission of Heterologous Highly Pathogenic H5N8 Clade 2.3.4.4b Challenge Virus in Commercial Broilers and Layer Pullets

Figure 2

Humoral immune response to vaccination in commercial broilers and commercial layers without MDA to AIV H5N1. Hemagglutination inhibition test was performed parallel with the antigen homologous to the vaccine and with the antigen prepared from the challenge virus. Age of birds at sampling is shown above the graph (DOA = days of age). Mean titer and standard deviation is shown as a horizontal bar with whiskers. Positivity limit is at least 3 log₂ HI titer.