TABLE 1.

Clostridioides difficile strains used in this study^a

Strain	Ribotype	Place/date of isolation/source	Reference
630	12	Zurich/1982/human	54
BI-9	1	Gerding Collection	53
CD196	27	France/1985/human	56
CD305	23	London/2008/human	52
CF5	17	Belgium/1995/human	53
Liv022	106	Liverpool/2009/human	52
Liv024	1	Liverpool/2009/human	52
M120	78	UK/2007/human	53
M68	17	Dublin/2006/human	53
R20291	27	London/2006/human	56
TL174	15	Cambridge, UK/2009/human	52
TL176	14	Cambridge, UK/2009/human	52
TL178	2	Belfast/2009/human	52

^aRelated to Fig. 1, 2, 3, and 5.