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Appl. Environ. Microbiol., 10 1996, 3668-3672, Vol 62, No. 10
Copyright © 1996, American Society for Microbiology

Specific detection and analysis of a probiotic Bifidobacterium strain in infant feces

RG Kok, A de Waal, F Schut, GW Welling, G Weenk and KJ Hellingwerf
Department of Microbiology, E. C. Slater Institute, BioCentrum Amsterdam, The Netherlands.

For specific detection of the probiotic Bifidobacterium sp. strain LW420 in infant feces and for rapid quality control of this strain in culture, three strain-specific 16S rRNA gene-targeted primers have been developed. These primers allow specific detection of the organism via PCR. Specificity of the primers was determined in DNA samples isolated from single-strain and mixed cultures of bifidobacteria and in heterogenous fecal samples. The feasibility of this method for use in specific detection of probiotic strains was investigated through addition of Bifidobacterium sp. strain LW420 to infant instant milk formula (IMF) and PCR analyses of bacterial DNA isolated from feces of 17 newborn IMF-fed infants. In feces of all nine babies that had been fed with the probiotic IMF, the strain-specific PCR signal could be detected. No signal was found in feces of the eight infants that had been fed with a nonprobiotic IMF, demonstrating the specificity of the PCR method. All 17 infants developed a major fecal Bifidobacterium population already after 3 days, as determined through genus-specific and strain-specific PCR. Phenotypical screening of Bifidobacterium sp. strain LW420 and analysis of homology of the 16S rRNA gene sequence of this strain with that of other bifidobacteria deposited in databases do not allow positive classification of LW420 among the currently known species of Bifidobacterium.

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