Figure 4. A single immunization of nucleoside-modified ZIKV prM-E mRNA-LNPs protects rhesus macaques from ZIKV challenge at 5 weeks post-immunization.

Six unvaccinated control macaques and five vaccinated macaques that received 50 μg (n=3), 200 μg (n=1), or 600 μg (n=1) of ZIKV mRNA-LNPs at week 0 were challenged s.c. with 104 TCID50 of ZIKV PRVABC59 at week 5. Viral loads were measured in plasma by qRT-PCR for ZIKV capsid RNA. Shaded area indicates values below the limit of detection (50 copies/ml), and undetectable values were staggered to show individual animals. Day 3 and 5 viremia in vaccine and control groups was compared by Mann-Whitney test: p<0.001.