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Variation of cultured skin microbiota in mothers and their infants during the first year postpartum.

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PubMed ID: 31025407

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Gaitanis G, Tsiouri G, Spyridonos P, Stefos Τ, Stamatas GN, Velegraki A, Bassukas ID

Pediatr Dermatol. Jul 2019. doi: 10.1111/pde.13829

COMMENT: This work presents the results of a longitudinal study of culturable skin bacteria in the mother-infant dyad during the first year of life. The study included 17 mother-infant dyads sampled 24 hours postpartum and at 3, 6, 9, and 12 months from 2 mother's skin areas ( chest and abdomen) and 2 areas of infants (forehead and buttocks).

Some bacteria were detected in many samples and others were not so common:

A total of 444 microbial strains were isolated belonging to 22 genera: 6 "frequent" (isolated from > 5% samples: S aureus, Proteus, Klebsiella, Pseudomonas, Enterobacter, and Enterococcus) and 16 "infrequent."

Some bacteria remained more constant in each individual and others were more variable:

Enterobacter, Enterococcus, Klebsiella, and Pseudomonas isolation rates varied significantly as a function of sampling time contrary to the rather constant isolation rates of Proteus and S aureus.

Concordant isolation of the same bacteria in mother and child was decreasing along time:

The rates of concordant isolation of the same microbial species within the mother-infant dyad tended to drop from birth to the end of the first year postpartum. Distinct variations in the isolation rates of skin commensals from specific anatomical sites of the mother-infant dyad indicate bidirectional microbial transmission. Increasing skin flora individuality of the growing infant was recorded, manifested by declining rates of concordant isolation of the same microbial species from mother and her infant.

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Raquel Tobes