Comparison of multilocus sequence types (STs) observed in symptomatic cases and asymptomatic participants, 01 April 2011 to 31 August 2012.

Asymptomatic carriers without the toxin A and B genes are indicated by “(−)”, see Table 6. Symptomatic cases are broken down by whether the case was diagnosed via the routine laboratory or as part of a C. difficile diagnostic study (toxin EIA-negative, culture positive) (see Methods). Single isolates were obtained from symptomatic cases from the following STs: 34, 51, 53, 66, 67, 75, 90, 103, 124, 133, 139, 150. In addition 10 symptomatic samples were obtained from 9 novel STs. In 6 symptomatic samples it was not possible to recover a complete in silico ST.