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What passes from mother to fetus?
Antibodies.
How does a fetus obtain preformed antibodies?
A fetus will start producing IgM antibodies about 20 weeks into the pregnancy. The only antibody the fetus receives from it's mother is IgG which the baby will not start producing on its own until a few months after birth.
What type of immunity results when antibodies are passed from mother to fetus?
natural immunity
What prevents the majority infections from spreading from mother to fetus?
Antibodies in the maternal blood prevent most infections from being transmitted to the fetus.
What is a source of passive immunity?
A source of passive immunity is when antibodies are transferred from one individual to another. This can occur naturally through breastfeeding or transplacentally from mother to fetus, or artificially through administration of pre-formed antibodies, such as in immune globulin injections.
With a Rh plus mother and a Rh- fetus will either develop antibodies against Rh antigens?
no when Rh negative blood from the fetus interacts with Rh+ blood of the mother there will be no antibodies produced due to absence of antigen on the Rh- blood cells and when Rh positive is mixed with Rh negative blood of fetus no response is produced due to the fact that the fetus has an underdeveloped immune system
What happens in passive immunity?
A mother may transfer some IgG antibodies passively through the placenta to the fetus.
What specific type of acquired immunity that a fetus obtains from maternal antibodies that cross the placenta is called?
Passive immunity because the antibodies pass from mother to fetus.
What prevents most toxoplasmosis from being passed from mother to fetus?
Very few infected people have symptoms and most pregnant women have antibodies that protect the fetus from infection.
What is natural passive?
Naturally-acquired passive immunity occurs when a fetus receives antibodies from its mother through the placenta. It also occurs when a baby receives antibodies through breastmilk.
The condition in which rh plus red blood cells of a fetus are attacked by anti-Rh antibodies of the fetus Rh-mother is called?
Heamolytic disease of the newborn or Erythroblastosis Fetalis
Why does erythroblastosis fetalis occur with a second pregnancy and normally not the first pregnancy?
The mother is exposed to fetal blood during childbirth or abortion. The Rh+ proteins on the surface of fetal erythocytes can trigger an immune response in the mother. This creates antibodies in the mother and memory lymphocytes that are able to create more antibodies. In the second pregnancy with a fetus with Rh factor, the antibodies in maternal blood can cross the placenta to the fetus and attack the fetus's erythocytes to cause erythroblastosis fetalis. The maternal blood in the first pregnancy does not contain such antibodies to cause the problem because the mother has never been exposed to the Rh factor until the time of first childbirth with the antigen.
