Rapidly fatal bacteremic pneumonia caused by Klebsiella pneumoniae with K1 hypermucoviscosity phenotype in a previously healthy young man receiving levofloxacin treatment.

Fatal bacteremic Klebsiella pneumoniae pneumonia is commonly encountered in alcoholic and diabetic patients. This report describes a previously healthy young man with rapidly fatal bacteremic pneumonia caused by K. pneumoniae serotype K1, complicated by septic shock and multiple organ dysfunction.