PCR targeted to the 16S-23S rRNA gene intergenic spacer region of Clostridium difficile and construction of a library consisting of 116 different PCRribotypes

A reference library of types of Clostridium difficile has been constructed by PCR ribotyping isolates (n = 2,030) from environmental (n = 89), hospita l (n = 1,386), community practitioner (n = 395), veterinary (n = 27), and r eference (n = 133) sources. The library consists of 116 distinct types iden tified on the basis of differences in profiles generated with PCR primers d esigned to amplify the 16S-23S rRNA gene intergenic spacer region. Isolates from 55% of infections in hospitals in the United Kingdom belonged to one ribotype (type 1), but this type was responsible for only 7.5% of community infections.