Figure 5From: Astragalus polysaccharide enhances immunity and inhibits H9N2 avian influenza virus in vitro and in vivoIllustrates the percentages of CD4 + T cell lymphocyte expression before and after immunization in vivo. CD4+ expression was greatest for the 20mg/kg APS group, both before and after immunization. CD4+ expression increased post immunization for the 5mg/kg APS group.Back to article page