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.