An unusual increase in cases of invasive meningococcal infection between late 2022 and early 2023. These cases sometimes had atypical presentations (large numbers of bacteremias without meningitis). The distribution of serogroups was also unusual in our center (large number of serotype Y meningococcal IMD). This development comes after three years marked by the Corona-Virus-Disease-19 pandemic, which led to a profound change in the behaviors involved in the transmission of infectious diseases. Barrier measures have considerably reduced the population's exposure to meningococcus, and may have encouraged a reduction in mucosal immunity to this pathogen. The end of 2022 was also marked by intense viral circulation (syncitial respiratory virus-influenza-COVID), which may have favored invasive forms.
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Number of patient presenting with Invasive Meningococcal infection and its serogroup
Timeframe: Two period of 18month, one when facial mask were recommanded, and one after