Introduction
Fusobacterium species are anaerobic, Gram-negative, rod-shaped,
adherent, non-motile and non-spore-forming bacteria.Fusobacterium nucleatum is
an oral bacterium, commensal to the human oral cavity, that plays a role
in periodontal disease and colorectal neoplasm1,2.F. nucleatum is a rare cause of bacteremia; the annual reported
incidence is 0.22–0.76 cases/100,000 population3,4.
Risk factors for F. nucleatum bacteremia include malignancy,
older age, alcohol abuse, immunosuppression, and dialysis; infection is
often hospital-acquired3.
Immunization of the population through vaccination is recognized as a
public health priority against COVID-19. The clinical efficacy and
safety for vaccines against the novel coronavirus is the most difficult
scientific challenge at present. We report the case of a 67-year-old
man, an immunocompetent patient with F. nucleatum bacteremia and
liver abscess formation following administration of the first dose of
anti-COVID-19 viral-vectored vaccine during the COVID-19 pandemic.