Table 6. Survival of BALB/c mice after intranasal challenge with S. pneumoniae ATCC6303 or A66.1 strains, after subcutaneous immunization.

	ATCC6303 (serotype 3, PspA5)			A66.1 (serotype 3, PspA2)
	alive/total	% of survival	P *	alive/total	% of survival	P *
Non	0/6	---	---	0/5	---	---
DT	0/6	---	---	0/6	---	---
DTPlow	0/6	---	---	0/6	---	---
PspA5	2/6	33.3	0.22	0/6	---	---
PspA5 + DT	4/6	66.6	0.03	3/6	50	0.09
PspA5 + DTPlow	6/6	100	0.001	4/6	66.6	0.03

^*Fisher exact test.