[Monkeypox to Mpox or the re-emergence of an old zoonosis].

Monkeypox is a zoonotic disease caused by the Monkeypox virus (MPXV) of the Orthopoxvirus genus. The first human cases occurred in Africa in the 1970s and remained confined to the African continent for a long time until 2003, when several dozen cases occurred in the United States, following contamination by prairie dogs. Unprecedented transmission events have led to more than 80,000 reported cases worldwide between May 2022 and February 2023, primarily affecting men who have sex with men. The changing epidemiology of Mpox has raised concerns about its ability to become endemic beyond its traditional geographic areas. Confirmatory diagnosis is based on direct detection by molecular biology. Pre- or post-exposure smallpox vaccination was widely deployed in early summer 2022 to limit the spread of the disease. In case of severe forms, the use of antivirals can be considered, only tecovirimat being recommended in this indication. The current epidemic has had the merit of showing that a disease that was previously confined to regions of initial virus circulation can spread very rapidly in Western countries and of the need to reinforce the implementation of tools for the surveillance and control of communicable diseases.