Haemophilus influenzae type b septicaemia associated with myonecrosis and thigh abscess

A case is reported of a male adult with Haemophilus influenzae type b septicaemia and subsequent abscess in the left thigh due to this microorganism following injection of phenylbutazone. The phenylbutazone probably caused muscle cell damage. It is assumed that Haemophilus influenzae type b colonized the site during an episode of septicaemia, with subsequent development of necrosis and abscess.