Table 1.

C. fetus survival after serum or antibiotic selection

Strain	Relevant phenotype				Selection*	No. of experiments
	Susceptibility to			Immunoblot presence of S layer, kDa			Survival, ×10−4
	Chloramphenicol	Kanamycin	Serum				Mean	Range
23D:AC100	R	S	S	—	Serum	7	1.0	0.2–3.1
23D:AC200	S	S	R	127	Chloramphenicol	6	1.2	0.1–2.5
23D:ACA2K101	S	R	S	—	Chloramphenicol	12	0.7	0.2–2.5
23D:ACA2K101	S	R	S	—	Serum	8	1.2	0.2–1.4
23D:ACA2K200	R	S	S	—	Kanamycin	3	0.8	0.4–1.1
23D:ACA2K400	S	S	R	97	Kanamycin	6	1.0	0.8–1.4
23D:ACA2K400	S	S	R	97	Chloramphenicol	6	1.2	0.6–2.2
23D:ACA2K450	S	S	R	127	Kanamycin	5	2.6	1.2–4.6
23D:ACA2K450	S	S	R	127	Chloramphenicol	6	2.5	1.0–4.6

S, Sensitive; R, resistant. 

^*Selection was performed by plating cells to media supplemented with 15 μg/ml chloramphenicol or 30 μg/ml kanamycin, or incubating cells in 10% NHS for 60 min at 37°C.