Objective: To estimate the sub-notification of fetus and child deaths which had innate syphilis as the main or associated cause in Recife, Pernambuco, Brazil, between 2010-2016. Methods: Probabilistic linkage was applied to the notified cases of innate syphilis present in the Notification Aggravation Information System and for fetus and child deaths caused by innate syphilis recorded in the Mortality Informatio...