Table 2. Comparison of Zika viral titer between Plaque Forming Unit (PFU), Focus Forming Unit (FFU), real time RT-PCR (Ct) and droplet digital RT-PCR (copy number/ml).

Virus name	Cell-based		Molecular-based
	PFU	FFU	Ct	Copy number/ml
MUMT-1/2016	5.60 x 107	2.40 x 107	13.214	9.47 x 108
MU-DMSC-2/2016	3.60 x 106	1.12 x 106	14.043	8.93 x 108
MU-DMSC-3/2016	1.04 x 106	5.53 x 105	13.416	9.61 x 108
MU-DMSC-4/2016	1.26 x 107	9.93 x 106	12.621	1.23 x 109
MU-DMSC-5/2016	1.17 x 106	1.40 x 106	13.208	9.70 x 108
MU-DMSC-6/2016	9.88 x 105	1.20 x 106	12.339	1.42 x 109
MU-DMSC-1/2017	1.83 x 107	1.26 x 107	13.660	5.99 x 108
MU-DMSC-2/2017	1.48 x 106	1.13 x 106	12.603	1.09 x 109
MU-DMSC-3/2017	4.00 x 106	1.53 x 106	13.247	9.66 x 108
MU-DMSC-4/2017	1.24 x 106	1.46 x 106	13.731	9.29 x 108
MU-DMSC-5/2017	1.00 x 106	1.03 x 106	14.311	4.99 x 108