Fig. 3

Frequency of true- and mock-immunized subjects experiencing local adverse events after each immunization 1–6. Number of local AEs (mild/moderate) experienced by each subject after true- and mock-immunizations 1–6. The numbers at the top of the graphs represent the number of individuals immunized at each immunization. The numbers at the top of each column represent the number of AEs/subject. The number of AEs per subject per immunization for each group were very similar in the true-immunized and mock-immunized subjects. All AEs were mild or moderate in severity except for one severe AE (swelling) in one true- and one-mock immunized subject at immunization 2 denoted by asterisks