Fig. 2
Individual FRNT90 titers of all FRNT positive study participants (n = 29). Mean FRNT90 titers with standard error for FRNT positive samples. Overall, 28 samples were positive in the FRNT using the reference strains of DENV-1 (red), DENV-2 (blue), DENV-3 (green) and DENV-4 (yellow). An additional FRNT with DENV-1 genotype V (pink) added one more seropositive study participant. The dashed line indicates threshold of 20. Asterisks indicate the statistically significant different mean FRNT90 titers between the DENV-1 reference strain and the DENV-1 genotype V strain with the other DENV serotypes (Mann-Whitney test, P < 0.0001)