All strains were susceptible to ampicillin and
erythromycin. Vancomycin and streptomycin tolerances were most common among species
whereas tolerances for gentamicin, clindamycin and tetracycline were rare. The tolerances
could provide additional benefit to strains in colonizing and replenishing gut microbiota after
antibiotic therapy. The results obtained in the study confirm that strain viability in gastric and
bile solution and antibiotic susceptibility are important attributes in the selection of potentially
probiotic bacteria.