This virus, which is transmitted, e.g., by Aedes aegypti mosquitoes, belongs to the group of Flavivirus and was first described in 1947 in rhesus monkeys in Uganda. Since then, the virus circulates in Africa, the Americas, and the Pacific. During an outbreak especially in Brazil in 2015/2016, it turned out that many cases of microcephaly occurred in unborn and newborn children. Whether this phenomenon is definitively related to an infection with this virus is not yet fully proven, since in general infections showed the following mostly mild signs of disease: