Microcephaly and central nervous system findings associated with congenital Zika virus and other infectious etiologies in the state of Rio de Janeiro: crosssectional study, 2015 a 2017Microcefalia y alteraciones del sistema nervioso central relacionadas con la infección congénita por el virus del Zika y otras etiologías infecciosas en el Estado de Río de Janeiro: estudio transversal, 2015-2017

To describe the clinical and epidemiological profile of cases with confirmed microcephaly or central nervous system (CNS) findings associated with congenital Zika virus infection and other infectious etiologies in the state of Rio de Janeiro, Brazil, from November 2015 to July 2017. A cross-sectional study was performed with 298 cases (as defined by the Ministry of Health) communicated to the Rio de Janeiro State Department of Health in the study period. Demographic, epidemiological, clinical, radiological, and laboratory variables were assessed. Descriptive bivariate and multivariable logistic regression analysis was used to determine the association between specific factors and death outcome. The median age of mothers was 24 years; 30.9% reported fever and 64.8% reported a rash during pregnancy. The median head circumference at birth was 29 cm, and median birth weight was 2 635 g. An etiological diagnosis of congenital Zika was made in 46.0%, whereas 13.8% were diagnosed with syphilis, toxoplasmosis, rubella, cytomegalovirus, and herpes simplex infections (STORCH), with predominance of syphilis, and 40.3% had an unspecified infectious agent. CNS findings other than microcephaly were observed in 88.3%, especially intracranial calcifications, ventriculomegaly, and brain atrophy. Overall lethality was 7.0% - 19.0% in laboratory confirmed Zika cases and 22.2% in toxoplasmosis cases. Multivariable analysis revealed birth weight as the main predictor of death. Despite the Zika epidemic, 13.8% of the studied cases were diagnosed with STORCH. The lethality and high frequency of neurological findings beyond microcephaly reflect severe infection, with impact on families and health care system.