| baseline prevalence of birth defects associated with congenital zika virus infection - massachusetts, north carolina, and atlanta, georgia, 2013-2014. | zika virus infection during pregnancy can cause serious brain abnormalities, but the full range of adverse outcomes is unknown (1). to better understand the impact of birth defects resulting from zika virus infection, the cdc surveillance case definition established in 2016 for birth defects potentially related to zika virus infection* (2) was retrospectively applied to population-based birth defects surveillance data collected during 2013-2014 in three areas before the introduction of zika viru ... | 2017 | 28253231 |