HIV virus cannot transmitt through placenta why?
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in the placenta, no blood is shared between mother and baby. the placenta diffuses the good nutrients from the mothers blood and then diffuses it into the babys blood. the HIV virus is in the blood only so the only way it can be passed from mother to baby is during childbirth. because no blood is shared babies can be born with a completely different blood type to their mothers.
Not sure what you are asking? HIV is transferred by mother to baby, by way of placenta by way of maternal/fetal blood flow. So yes I would say it crosses the placenta.
It doesn't usually cross the placenta because there is a membrane separating the mother's blood from the fetus's. The membrane lets nutrients and gases like oxygen pass, but not usually larger particles like cells or viruses.
Sometimes, especially late in the pregnancy, the membrane can get broken, allowing small amounts of the mother's blood to come in direct contact with the fetus's. Some mother to baby infections can happen then, but most mother to baby transmission occurs during birth or through breastfeeding.
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