[Clinical features in six patients with liver abscess caused by Streptococcus milleri]

Among 39 patients with pyogenic liver abscess who were admitted to our institute, six (15%) were infected by Streptococcus milleri (S. milleri). We investigated clinical features of these six patients. There were five males and one female, aged 43-81 years old (mean: 61). Five of the six patients had underlying illness. All patients had fever, and three of them complained of abdominal pain. Three patients had mixed infections; particularly intraoral anaerobes, Fusobacterium, were found in two of the three patients. There were no differences in clinical features between patients with S. milleri liver abscess and those with other bacterial liver abscess. In conclusion, on selecting antibiotics for the treatment of liver abscess, it is necessary to consider the S. milleri and intraoral anaerobes.