Fig. 6: Humoral immune responses toward childhood vaccines.
From: Effects of the age of vaccination on the humoral responses to a human papillomavirus vaccine
a, b The presence of antibodies toward the measles (a) and oral polio (OPV, b vaccines were measured in subjects and presented as antibody index or optical density (OD), according to the assay used. Dotted lines represent cut-off values for positivity. The number of subjects analyzed (n) and of positive individuals (p) for each age-group are reported in the figure. Statistical significance was determined by the Mann-Whitney test and all p-values are shown.
