Group B streptococcal infection pathophysiology: Difference between revisions
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==Pathophysiology== | ==Pathophysiology== | ||
=== | ===GBS in Pregnancy=== | ||
The gastrointestinal tract serves as the primary reservoir for GBS and is the likely source of vaginal colonization. | |||
===GBS in Neonates=== | |||
Early-onset infections are acquired vertically through exposure to GBS from the vagina of a colonized woman. Neonatal infection occurs primarily when GBS ascends from the vagina to the amniotic fluid after onset of labor or rupture of membranes, although GBS also can invade through intact membranes (32,33). GBS can be aspirated into the fetal lungs, which in turn can lead to bacteremia. Infants also can become infected with GBS during passage through the birth canal; infants who are exposed to the organism through this route can become colonized at mucus membrane sites in the gastrointestinal or respiratory tracts, but these colonized infants most commonly remain healthy. | Early-onset infections are acquired vertically through exposure to GBS from the vagina of a colonized woman. Neonatal infection occurs primarily when GBS ascends from the vagina to the amniotic fluid after onset of labor or rupture of membranes, although GBS also can invade through intact membranes (32,33). GBS can be aspirated into the fetal lungs, which in turn can lead to bacteremia. Infants also can become infected with GBS during passage through the birth canal; infants who are exposed to the organism through this route can become colonized at mucus membrane sites in the gastrointestinal or respiratory tracts, but these colonized infants most commonly remain healthy. | ||
Revision as of 19:01, 19 August 2014
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Group B Streptococcal Infection Microchapters |
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Differentiating Group B Streptococcal Infection from other Diseases |
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Group B streptococcal infection pathophysiology On the Web |
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Risk calculators and risk factors for Group B streptococcal infection pathophysiology |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Rim Halaby, M.D. [2]
Overview
Pathophysiology
GBS in Pregnancy
The gastrointestinal tract serves as the primary reservoir for GBS and is the likely source of vaginal colonization.
GBS in Neonates
Early-onset infections are acquired vertically through exposure to GBS from the vagina of a colonized woman. Neonatal infection occurs primarily when GBS ascends from the vagina to the amniotic fluid after onset of labor or rupture of membranes, although GBS also can invade through intact membranes (32,33). GBS can be aspirated into the fetal lungs, which in turn can lead to bacteremia. Infants also can become infected with GBS during passage through the birth canal; infants who are exposed to the organism through this route can become colonized at mucus membrane sites in the gastrointestinal or respiratory tracts, but these colonized infants most commonly remain healthy.