VA Â» Office of Public and Intergovernmental Affairs Â» History of Veterans Day. World War I â known at the time as âThe Great Warâ - officially ended when the Treaty of Versailles was signed on June 28, 1919, in the Palace of Versailles outside the town of Versailles, France.
If your blood mixes with Rh-positive blood, your immune system will react to the Rh factor by making antibodies to destroy it. This immune system response is called Rh sensitization. Rh sensitization can occur during pregnancy if you are Rh-negative and pregnant with a developing baby (fetus) who has Rh-positive blood.
When an Rh negative mother is carrying an Rh positive baby, some of the Rh positive blood from the baby gets into the Rh negative blood of the mother. This Rh positive blood from the baby acts like a foreign substance to the mother.n pregnancy, Rh is especially important when an Rh negative woman carries an Rh positive child. Remember, when a woman is Rh negative, it means she does not have the Rh factor. In the normal course of pregnancy, small amounts of the baby's blood get into the mother's bloodstream.