RNAs from infected as well as non-infected (NI) PCNs and MEFs were collected at different times post-infection (p.i.)and the level of ZIKV RNA (Fig. 1c) as well as of mRNAs of genes coding for IFNB (Fig. 1d) and several ISGs (Fig. 1e) was analyzed by RT-qPCR. Here, IFNB1 is linked to infection.