The investigators will carry out a case-control study among mothers who delivered their babies at Nossa Senhora de Lourdes maternity hospital located in Aracaju, state of Sergipe, Brazil from September 1, 2015 through January 5, 2016. Data sources for the phase I of the study will consist of medical records review and a standard questionnaire applied by telephone to collect information about demographic features, clinical signs and symptoms, and the duration and severity of the illness. Phase II will include dengue, chikungunya and dengue serologic test results as secondary outcome, if available. The objective of this study is to investigate the occurrence of rash accompanied by three or more dengue-like signs and symptoms during pregnancy is related to the microcephaly using the case-control design