Table 1.

Recovery of H. ducreyi from immunized pigs^a

Challenge strain	Expt no.	NPS immunization			Anti-nHgbAI immunization
		Pig	H. ducreyi-positive biopsies (% of 4 total biopsies) after inoculation with:		Pig	H. ducreyi-positive biopsies (% of 4 total biopsies) after inoculation with:
			103 CFU	104 CFU		103 CFU	104 CFU
Class I strain,	1				C	0	0
35000HPhgbAI		B	4 (100)	4 (100)	D	0	0
	2	E	4 (100)	4 (100)	G	0	2 (50)
		F	4 (100)	4 (100)	H	0	1 (25)
	Total		12 (100) (A)	12 (100) (B)		0 (0) (A)	3 (19) (B)
Class II strain,	1				C	4 (100)	1 (25)
35000HPhgbAII		B	4 (100)	4 (100)	D	4 (100)	4 (100)
	2	E	4 (100)	4 (100)	G	4 (100)	4 (100)
		F	4 (100)	4 (100)	H	4 (100)	4 (100)
	Total		12 (100)	12 (100)		16 (100)	13 (81)

^aResults followed by the same uppercase letter were significantly different: A and B, P < 0.001.