Zika virus‐induced brain malformations in chicken embryos.

Background: Zika virus (ZIKV) was confirmed to be related to microcephaly in 2016. However, there is still a need for understanding the embryonic morphological changes induced by ZIKV and when they occur. Here, chicken embryos were chosen as experimental model of ZIKV to evaluate virus‐associated morphological alterations that might take place during embryonic development. Methods: A screening with different viral doses was conducted in embryos at HH Stage 10–12 (E1.5) as well as a follow up of the first 5 days postinfection (dpi) was performed to observe the main morphologic changes post ZIKV infection. Results: ZIKV exposed embryos presented a higher prevalence of mortality and defects such as brain malformation when compared to controls. Moreover, we observed that the phenotypes become more evident at 4dpi, when the viral load quantification reaches a peak. Conclusions: We found that ZIKV exposed embryos presented a high prevalence of mortality and central nervous system (CNS) abnormalities in a dose‐dependent manner. The phenotype was more evident 4 days postinfection, when the viral load quantification reached a peak. [ABSTRACT FROM AUTHOR]