[The International Classification of Diseases, the Family of International Classifications, the ICD-11, and post-polio syndrome].

The first International Classification of Diseases (ICD) was approved in 1893 and since then it has been periodically reviewed. The last, 10th revision (ICD-10), was approved in 1989. Since 1989, it was possible to update from ICD revisions, which did not happen before.

[Death and its epidemiological investigation: considerations about some relevant aspects].

This article addresses death and issues related to its investigation, as important components for Epidemiology/Public Health. It highlights aspects linked to the improvement of quality of investigation and surveillance of death, as well as the advance of scientific/epidemiological research in this area, analyzed in view of current legislation and ethical principles in Brazil. We discuss the problem related to knowing "whom the health information belongs to and which are the limits of its utilization", considering also the possibility of using identified databases.