N. Meningitidis serogroup (A, B, C), are main causers of disease. Serogroup W-135 incidence is lower nowadays and, although it is increasing, is such an uncommon infection in adults.
We report a case of a monoarthritis knee due to Neisseria meningitidis ( W- 135 ) in an inmunocompetent 50 year- old male.

© 2020 Galicia Clínica.

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