TABLE 3.

Homotypic protection of mice after oral immunization and challenge infection with pneumococcus type 19F

Vaccine	No. of mice	Concn (CFU/ml, mean ± SEM) of S. pneumoniae from:
		Bronchoalveoli	Blood
Mock	5	4,140 ± 935	906 ± 188
ePsaA	15	554 ± 186	67 ± 41
nPsaA−CTB	8	570 ± 287	11 ± 7
ePsaA−CTB	8	425 ± 193	33 ± 26
e(PsaA−CTB)1	7	140 ± 63	3 ± 1
e(PsaA−CTB)2	7	176 ± 169	23 ± 15
e(PsaA−CTB)3	9	510 ± 255	132 ± 79