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.
If a woman has a negative Rh factor and her partner has a positive Rh factor, she is considered to be at risk because it can cause the baby to become Rh positive. During pregnancy, the blood supplies of the fetus and the mother are separate, but there are instances it can be passed through to the child.