Legionnaires' disease in a patient with systemic lupus erythematosus.

A young woman with systemic lupus erythematosus developed a rapidly fatal pneumonia from which no visible or culturable organisms were found. Subsequent stains disclosed typical findings of Legionnaires' disease. A cutaneous portal of entry was suspected and a fulminant lung abscess developed, neither of which has been previously reported in Legionnaires' disease.