Microcephaly Case Fatality Rate Associated with Zika Virus Infection in Brazil: Current Estimates.

Considering the currently confirmed cases of microcephaly and related deaths associated with Zika virus in Brazil, the estimated case fatality rate (CFR) is 8.3% [95%CI:7.2-9.6]. However, a third of the reported cases remains under investigation. If the confirmation rates of cases and deaths are the same in the future, the estimated CFR will be as high as 10.5% (95%CI:9.5-11.7).