Unusual gastrointestinal infection Unusual cholangitis Unusual biliary tract infection Unusual infectious cholangitis Unusual susceptibility to cholangitis Increased susceptibility to infectious cholangitis, as manifested by recurrent or severe infection of the biliary tract, or by cholangitis occurring in an unusual clinical context such as absence of cholelithiasis or biliary obstruction. Causative agents include bacteria (Escherichia coli, Klebsiella pneumoniae, Enterococcus species) and fungi (Candida species).