             $\boxed{positive}$   negative             negative             negative   DENV-0                               negative             $\boxed{positive}$   negative             negative   DENV-0                               negative             negative             $\boxed{positive}$   negative   DENV-0                               negative             negative             negative             $\boxed{positive}$  DENV, dengue virus; RT-iiPCR, reverse transcription-insulated isothermal polymerase chain reaction; qRT-PCR