Bacterial colonization level.
GF mice were sterile before
inoculation. After inoculation, bifidobacteria were established
at a high level, with a mean of 9.5
0.8 log
10
CFU/g of cecal
content, ranging from 8.0
0.8 log
10
CFU/g of cecal content
for
B. adolescentis
to 10.3
0.3 log
10
CFU/g of cecal content
for
B. breve
BS56. No exogenous bifidobacteria were found