Until recently the Zika virus was a rare and mild public health concern and little was known about it In early 2015 Brazil reported an epidemic of Zika viral infection Reports soon followed of unusual numbers of neurological lisorders such as microcephaly in newborns a condition Characterized by a very small head and poor brain growth Macmillan Learning In early 2016 the Centers for Disease Control Prevention CDC announced that Zika cause microcephaly and other birth defects The ar included this sentence The report notes that piece of evidence provides conclusive proof th infection is a cause of microcephaly and other brain defects Explain how a conclusion of causality can despite the lack of direct evidence O It is not biologically plausible for the cause brain issues for newborns O One needs to conifirm that microcept defects occur before the Zika virus in A conclusion of causality can be reac association between Zika virus infec incidence of microcephaly and other defects is strong and consistent O A conclusion of causality can be rea polling subjects infected with Zika carefully constructed survey CDC CDC concludes Zika causes microcephaly am April 13 2016 www cdc gov media releases 2016 sC microcephaly html