TABLE 4.

Rate of acid production by Lactobacillus spp.

Species	Acid production (106 proton/s/bacterium) by Lactobacillus cultures started ata:
	6.2>pHi>5.7	5.3>pHi>5.0	4.2>pHi>4.0
L. crispatus
I	0.6	1.2	25b
II	0.6	1.2	7.7b
III	0.3	1.4b	7.1b
L. gasseri	1	2.6	15
L. jensenii
Ic	0.8	1.1	No growth
II		Not determined
III	1.6	1.2	No growth
L. vaginalis	0.6	1.0	2.7

^aAll experiments started at ∼10⁷ bacterium/ml. Results were calculated during the 0- to 8-h period unless otherwise noted. 

^bCalculated during the 8- to 16-h period. 

^cThis species showed a ΔOD₆₀₀ of <0.2 when started in this pH range.