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    Pregnancy significantly alters the human microbiome, with microbial changes at various body sites being essential for a healthy gestation. These dynamic shifts are vital, unlike dysbiosis seen in other conditions.

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    Area of Science:

    • Microbiome research
    • Human physiology
    • Reproductive health

    Background:

    • The human microbiome plays crucial roles in host metabolism, immunity, and health.
    • Microbial composition is influenced by environmental factors, diet, weight, and hormones.
    • Pregnancy involves significant physiological changes, including weight gain and altered metabolism and immunity.

    Purpose of the Study:

    • To review known changes in microbial composition during pregnancy.
    • To describe studies linking pregnancy complications with microbial alterations.
    • To highlight the importance of pregnancy-associated microbial shifts for maternal and fetal health.

    Main Methods:

    • Literature review of microbiome studies during pregnancy.
    • Analysis of microbial composition at various body sites (gut, vagina, oral cavity, placenta).
    • Examination of correlations between microbial changes and pregnancy outcomes.

    Main Results:

    • Significant alterations in the microbiome occur across multiple body sites during pregnancy.
    • Specific microbial changes have been linked to pregnancy complications.
    • Pregnancy-associated microbial shifts are distinct from dysbiosis in other conditions.

    Conclusions:

    • Microbial alterations during pregnancy are likely essential for a healthy gestation.
    • These microbial changes are probably coordinated with host immune, endocrine, and metabolic adaptations.
    • Further research is needed to elucidate the precise mechanisms and pathways involved.