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Due to the recent overhaul of the procedure on mandatory disclosure of infectious diseases (law relating to the reinforcement of sanitation quality control established in July 1998, and the May 1999 and May 2001 decrees on the application of this law), wishing to take advantage of this opportunity, the authors propose a chronological review retracing the history of these legal declarations. For over a century, they have represented the main instrument used for intervention and surveillance allowing for the fight against infectious diseases. The health options kept have varied over the years, as well as the precautions taken to respect secrecy (nominative or anonymous disclosure, modalities of transmission…). Procedures adopted to reconcile the principle of confidentiality along with the necessity to protect public health in the case where it would require an immediate and urgent intervention are examined throughout the chronology (determining the source of contamination, prevention of contagion).