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Dynamics of microbial colonization of the oral cavity in newborns

Paulo Nelson-Filho, Izabela Gonçalves Borba, Késsia Suênia Fidelis de Mesquita

    Brazilian Dental Journal
    |November 1, 2013
    PubMed

    Insights

    Newborns

    Area of Science:

    • Neonatal microbiology
    • Oral microbiome development
    • Host-microbe interactions

    Background:

    • Neonates possess underdeveloped host defense mechanisms, increasing susceptibility to infections.
    • Early microbial colonization plays a critical role in shaping the infant immune system.
    • Understanding oral microbial dynamics in newborns is crucial for preventing neonatal infections.

    Purpose of the Study:

    • To investigate the temporal patterns of oral microbial colonization in healthy newborns.
    • To identify the predominant bacterial species colonizing the neonatal oral cavity within the first 53 hours of life.

    Main Methods:

    • Collection of 81 oral microbiota samples from 51 healthy newborns within 53 hours of birth.
    • Microbiological analysis involving colony-forming unit counts for specific bacterial groups.
    • Targeted detection of streptococci, staphylococci (including Staphylococcus epidermidis and Staphylococcus aureus), and Gram-negative aerobic bacilli.

    Main Results:

    • Staphylococcus epidermidis colonization increased significantly from 30.7% at 0-8 hours to 88.89% by 24-53 hours.
    • Streptococci colonization rose from 56.5% at 8-16 hours to 94.4% by 24-53 hours.
    • Staphylococcus aureus detection was observed in 37.03% of samples between 16-24 hours, decreasing slightly to 33.3% by 24-53 hours. Mutans streptococci were notably absent.

    Conclusions:

    • Oral microbial colonization in newborns is a dynamic process, with rapid increases in Staphylococcus and streptococci species.
    • Strict hygiene practices and aseptic hospital procedures are essential to minimize the risk of infections in neonates.
    • Further research into early microbial colonization can inform strategies for promoting infant health and preventing neonatal sepsis.

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