The HACEK group includes weakly virulent, gram-negative organisms that primarily cause endocarditis.
The HACEK group of nonmotile, gram-negative bacilli or coccobacilli contains a number of minimally pathogenic, slow-growing, fastidious genera. Their primary pathology is endocarditis in susceptible people; about 1% of endocarditis cases are due to this group. The group consists of
Antibiotic sensitivities differ among species, so treatment should be directed by susceptibility testing.
Last full review/revision August 2009 by Burke A. Cunha, MD
Content last modified February 2012