Community-acquired brain abscess in Taiwan: etiology and probable source of infection.

Brain abscess is a life-threatening infection caused by spread from infected parameningeal or remote foci. Historically, streptococci have been the predominant organisms reported while brain abscess metastatic from liver abscess caused by Klebsiella pneumoniae has been a more recent emerging problem. This study retrospectively analyzed the characteristics of community-acquired brain abscess admitted during an 11-year period. There were 17 men and 7 women with age from 20 to 82 years (median, 41 years). The most common source of infection was liver abscess, followed by otitic infection and sinusitis. The classic triad of fever, headache and focal neurologic deficit was noted in only 25% of cases. Spread of the abscess to multiple lobes was common (n = 6). The most commonly identified organisms were Streptococcus spp. (n = 7) and K. pneumoniae (n = 5). All 5 cases of K. pneumoniae brain abscess also had concomitant pyogenic liver abscess and 4 of them had diabetes mellitus. In this study, brain abscess was common in young patients and in patients with diabetes mellitus. In Taiwan, Streptococcus spp. and K. pneumoniae are leading etiologies for community-acquired brain abscess. Liver abscess is the most likely source of K. pneumoniae brain abscess.