<i>Moraxella catarrhalis</i> rarely causes severe infections or bacteraemia in healthy subjects. In the literature only four cases of clinical sepsis with <i>M. catarrhalis</i> have been described, mostly in immunocompromised patients.
We describe a case of a 34-year-old patient with Kugelberg-Welander disease and low body weight (28 kg) who developed clinical sepsis due to <i>M. catarrhalis</i> bacteraemia.
A review of the literature is given.