Notes from the field: evidence of zika virus infection in brain and placental tissues from two congenitally infected newborns and two fetal losses–Brazil, 2015 - Martines, R B; Bhatnagar, J; Keating, M K; Silva-Flannery, L; Muehlenbachs, A; Gary, J (MMWR Morb Mortal Wkly Rep, 2016)