Increasing burden of biliary tract infection caused by extended-spectrum beta-lactamase-producing organisms in Korea: A nationwide population-based study.

The prevalence of BTIs caused by ESBL-PO has increased during the last 10 years. Initial carbapenem therapy should be considered for elderly patients with acute cholangitis if they have had a previous biliary procedure and/or a history of carbapenem administration within the previous 90 days.