The different Lactobacillus species expressed as a percentage of
all lactobacilli are given in Table 5. In breast-fed infants L. acidophilus,
L. paracasei, and L. casei were the most dominant species
throughout the study period. The breast-fed infants also
showed a significant increase during the study period of L.
acidophilus (13.6% 3.4% versus 23.5% 4.5% [P 0.017]),
L. paracasei (7.2% 3.3% versus 22.1% 6.1% [P 0.027]),
and L. casei (4.0% 1.3% versus 6.0% 1.8% [P 0.028]).
At inclusion, the infants receiving OSF or SF showed a Lactobacillus
distribution with relatively high proportions of L.