Fig. 1.
Immune responses to influenza vaccine. (A) Proliferative responses: Results
are expressed as individual values of stimulation index (SI). PBMC from vaccinated
(empty symbols) and non-vaccinated (full symbols) recipients were cultured with
H1N1 (triangles), H3N2 (circles) or AdV (squares) antigens. The median values are
indicated (—) for each group (median of all values for influenza stimulation and
median of positive values for AdV stimulation). The horizontal dashed lines indicate
the threshold of positivity for H1N1 and H3N2 (SI: 9, that is the lower value found
in healthy vaccinated controls) and the threshold of positivity for AdV (SI: 5, that
discriminates immune from non-immune individuals).
p values (Wilcoxon test)