STEP 507: A HACEK by Any Other Name (CE: 1.0)


Aggregatibacter aphrophilus is commonly implicated in endocarditis. This article describes an occurrence of osteomyelitis, taxonomy changes, and metabolic pathways of the organism.


Learning Objectives:

  • Define the HACEK organisms, common infections, and antibiotic treatment
  • Explain X and V factor effects on bacterial metabolic pathways
  • Describe the limitations of susceptibility testing of HACEK organisms


Juline Dubov, (MLS (ASCP)
Joel Mortensen, PhD, FAAM, HCLD
Andrew Cox, MD, PhD


Launched: 2023