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

Figure 2.

Figure 2

Neutralizing antibody levels and seropositivity rates before and after primary and secondary 17DD vaccination for YF. We detected 17DD-specific neutralizing antibodies by micro plaque-reducing neutralization test (micro-PRNT50) and determined seropositivity rates by considering serum dilution >1:50 as the cutoff criterion for PRNT positivity. A) Scatter graph of PRNT titers, expressed as reverse of serum dilution. B) Percentage of PRNT seropositivity (serum dilution >1:50). Gray dashed lines indicate critical seropositivity rates <80%. Participant subgroups indicate number of days or years since vaccination (in parentheses; d0 for those never vaccinated). #PV, had primary vaccination >10 years previously; NV, not vaccinated; PV, had primary vaccination only; RV, revaccinated; YF, yellow fever..