Fig. 2

Longitudinal tracking of neutralizing antibody titers in Rhesus macaques with sequential vaccination. a Long-term observation of neutralizing antibodies titer for WH09 in IV monkeys. b Long-term observation of neutralizing antibodies titer for WH09 in RV monkeys. Significant differences are indicated with asterisks (*P < 0.05, **P < 0.01; Student’s t test)