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. 2019 Aug;25(8):1511–1521. doi: 10.3201/eid2508.181432

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Overall proportion of participants with resultant memory before and after primary or secondary 17DD vaccination for YF as assessed by PRNT and EMCD8 measurement at participant level. Graphs show the proportion of participants above the cutoff threshold; that is, PRNT positivity at serum dilution >1:50 and EMCD8 index above the global median value. We then determined the resultant memory for each subgroup in the primary vaccination arm (A) and secondary vaccination (B) of the study. Participant subgroups indicate number of days or years since vaccination (in parentheses; d0 for those never vaccinated). Lowercase letters indicate significant differences (p<0.05 by χ² test) of resultant memory status among study groups: a for comparisons with NV(d0) participants; b for comparisons with PV(d30–45) participants; c for comparison with PV(y1–5) participants; and d for comparison with #PV(y>10) participants. #PV, had primary vaccination >10 years previously; NV, not vaccinated; PRNT, plaque-reducing neutralization test; PV, had primary vaccination only; RV, revaccinated; YF, yellow fever.