TABLE 2.

Comparison of cytotoxic activities of polymyxin B extracts of human and poultry Campylobacter isolates on different cell lines

Isolate no.	Genotypea	Biotypeb	Cytotoxic activityc on cell line:
			CHO	INT-407	Vero
853	18	CJ-3	64	16	<4
881	18	CJ-3	16	16	<4
897	18	CJ-3	32	NTe	NT
2183	18	CJ-3	16	NT	NT
2220	18	CJ-3	4	8	<4
876	20	CJ-3	8	NT	NT
1250	27	CJ-3	8	16	16
1257	27	CJ-3	128	16	4
1262	27	CJ-3	32	32	<4
1269	27	CJ-3	16	16	<4
1278	27	CJ-3	32	16	8
1500	31 (U)	CJ-3	32	16	<4
2005	41 (U)	CJ-4	64	32	8
2150	44	CJ-3	64	32	<4
2155	44	CJ-3	16	16	<4
2165	44	CJ-3	32	8	<4
2169	44	CJ-3	16	NT	NT
2178	44	CJ-3	32	32	<4
2188	44	CJ-3	64	8	<4
2194	44	CJ-3	32	16	<4
2199	44	CJ-3	16	16	<4
Human-1	1 (U)	CJ-1	64	32	16
Human-41	5 (U)	CJ-4	16	16	<4
Human-142	9	CJ-2	64	16	8
Human-144	9	CJ-2	64	16	4
Human-176	50 (U)	CJ-4	16	16	32
2070d	42	CJ-2	<4	<4	<4

^aKpnI profiles. U, unique.

^bCJ, C. jejuni.

^cReciprocal cytotoxicity titers.

^dNoncytotoxic strain

^eNT, not tested.