RNA was extracted from brain, eye and spleen tissue samples using RNeasy Plus Mini Kit (QIAgen), following the manufacturer’s recommendations. Viral RNA was quantified using One Step Taqman RT-qPCR (Thermo Fisher Scientific) on a 7500 Real-Time PCR System (Applied Biosystems) with primers and probe designed by Lanciotti and collaborators44 (link). ZIKV copies were calculated by interpolation onto an internal standard curve formed of eight 10-fold serial dilutions of a synthetic ZIKV RNA based on the Asian lineage. The ZIKV quantification was displayed in ZIKV RNA copies per gram of tissue.
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